{"id":479,"date":"2024-04-10T22:55:52","date_gmt":"2024-04-10T14:55:52","guid":{"rendered":"https:\/\/qwq.cafe\/?p=479"},"modified":"2025-02-19T22:59:48","modified_gmt":"2025-02-19T14:59:48","slug":"singular-homology","status":"publish","type":"post","link":"https:\/\/qwq.cafe\/?p=479","title":{"rendered":"Singular Homology"},"content":{"rendered":"\n<p>This document is a seminar note on singular homology.<\/p>\n<p>Before reading this article, make sure you have known the Chapter 1-3 of <em>An Introduction to Algebraic Topology<\/em>, written by Rotman.<\/p>\n<p>You can download the pdf version from this <a href='https:\/\/github.com\/Hookan\/MyMathNotes\/tree\/main\/Algebraic%20Topology'>link<\/a>.<\/p>\n<p><strong>Reference<\/strong><\/p>\n<ul>\n<li><em>An Introduction to Algebraic Topology<\/em>, Rotman<\/li>\n<li><em>Topology and Geometry<\/em>, Bredon <\/li>\n<li><em>\u4ee3\u6570\u5b66\u65b9\u6cd5 \u5377\u4e00\uff1a\u57fa\u7840\u67b6\u6784<\/em>, \u674e\u6587\u5a01<\/li>\n<li><a href='https:\/\/ncatlab.org\/'>nlab<\/a><\/li>\n\n<\/ul>\n<p><strong>Why should we learn homology?<\/strong><\/p>\n<p>When we use calculus to solve physical problems, we often encounter functions like<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n16\" cid=\"n16\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"37.121ex\" height=\"5.451ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1380 16407.4 2409.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.329ex;\"><defs><path id=\"MJX-4-TEX-I-1D438\" d=\"M492 213Q472 213 472 226Q472 230 477 250T482 285Q482 316 461 323T364 330H312Q311 328 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xlink:href=\"#MJX-4-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1619.8,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-4-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(2620,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D466\" xlink:href=\"#MJX-4-TEX-I-1D466\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(523,289) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-4-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3768.8,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-4-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(4769,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-4-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(498,289) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-4-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"msup\" transform=\"translate(5670.5,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-4-TEX-N-29\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(422,289) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"33\" xlink:href=\"#MJX-4-TEX-N-33\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(500,0)\"><g data-mml-node=\"mo\"><use data-c=\"2F\" xlink:href=\"#MJX-4-TEX-N-2F\"><\/use><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(1000,0)\"><use data-c=\"32\" xlink:href=\"#MJX-4-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><rect width=\"7403.2\" height=\"60\" x=\"120\" y=\"220\"><\/rect><\/g><g data-mml-node=\"mo\" transform=\"translate(12935.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-4-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(13324.1,0)\"><use data-c=\"1D465\" xlink:href=\"#MJX-4-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(13896.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-4-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(14340.8,0)\"><use data-c=\"1D466\" xlink:href=\"#MJX-4-TEX-I-1D466\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(14830.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-4-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(15275.4,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-4-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(15740.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-4-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16129.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-4-TEX-N-2C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.974ex\" height=\"2.032ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -704 1756.7 898\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-640-TEX-I-1D458\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><path id=\"MJX-640-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-640-TEX-I-1D444\" d=\"M399 -80Q399 -47 400 -30T402 -11V-7L387 -11Q341 -22 303 -22Q208 -22 138 35T51 201Q50 209 50 244Q50 346 98 438T227 601Q351 704 476 704Q514 704 524 703Q621 689 680 617T740 435Q740 255 592 107Q529 47 461 16L444 8V3Q444 2 449 -24T470 -66T516 -82Q551 -82 583 -60T625 -3Q631 11 638 11Q647 11 649 2Q649 -6 639 -34T611 -100T557 -165T481 -194Q399 -194 399 -87V-80ZM636 468Q636 523 621 564T580 625T530 655T477 665Q429 665 379 640Q277 591 215 464T153 216Q153 110 207 59Q231 38 236 38V46Q236 86 269 120T347 155Q372 155 390 144T417 114T429 82T435 55L448 64Q512 108 557 185T619 334T636 468ZM314 18Q362 18 404 39L403 49Q399 104 366 115Q354 117 347 117Q344 117 341 117T337 118Q317 118 296 98T274 52Q274 18 314 18Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D458\" xlink:href=\"#MJX-640-TEX-I-1D458\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(521,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-640-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(965.7,0)\"><use data-c=\"1D444\" xlink:href=\"#MJX-640-TEX-I-1D444\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">k,Q<\/script> are constants.<\/p>\n<p>It can be noticed that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.166ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3167.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-641-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-641-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-641-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-641-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-641-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(389,0)\"><use data-c=\"30\" xlink:href=\"#MJX-641-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-641-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1333.7,0)\"><use data-c=\"30\" xlink:href=\"#MJX-641-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1833.7,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-641-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2278.3,0)\"><use data-c=\"30\" xlink:href=\"#MJX-641-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2778.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-641-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(0,0,0)<\/script> is a singularity of it, and when integrating this function, we always choose an integration path or integration surface that bypasses the singularity. Moreover, from Maxwell&#39;s equations (or Stokes&#39; theorem), we know that if we choose a closed surface in space for integration, the value of the integration only relates to the singularities inside. Here, the singularities can be considered as holes in the space defined by the function. This is why we are interested in the holes in space and consequently study their properties.<\/p>\n<p>Homology was initially defined as closed curves or surfaces with the same integral values, but this definition cannot adapt to general topological spaces. From a geometric intuition, a hole should be a type of topological invariant that remains unchanged under homeomorphism. Therefore, we need to find some new methods to define homology, and thereby study the properties of these holes. Next, we will begin to learn a definition method of homology, which is the singular homology.<\/p>\n<h2 id='1-definition-of-singular-homology'>1. Definition of Singular Homology<\/h2>\n<p>Let&#39;s begin with some basic definitions.<\/p>\n<blockquote><p><strong>1.1 Definition.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.697ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 750 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-828-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D434\" xlink:href=\"#MJX-828-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">A<\/script> be a set and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"38.605ex\" height=\"2.452ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 17063.5 1083.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-643-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 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data-c=\"73\" xlink:href=\"#MJX-643-TEX-N-73\" transform=\"translate(528,0)\"><\/use><use data-c=\"20\" xlink:href=\"#MJX-643-TEX-N-20\" transform=\"translate(922,0)\"><\/use><use data-c=\"66\" xlink:href=\"#MJX-643-TEX-N-66\" transform=\"translate(1172,0)\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-643-TEX-N-69\" transform=\"translate(1478,0)\"><\/use><use data-c=\"6E\" xlink:href=\"#MJX-643-TEX-N-6E\" transform=\"translate(1756,0)\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-643-TEX-N-69\" transform=\"translate(2312,0)\"><\/use><use data-c=\"74\" xlink:href=\"#MJX-643-TEX-N-74\" transform=\"translate(2590,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-643-TEX-N-65\" transform=\"translate(2979,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16563.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-643-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">F=\\{f:A\\to \\mathbb Z;f^{-1}(\\mathbb Z-\\{0\\}) \\text{ is finite}\\}<\/script>. 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data-c=\"5B\" xlink:href=\"#MJX-5-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1833.6,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-5-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2640.3,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-5-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3918.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-5-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-5-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4844.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-5-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5233.7,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-5-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5762.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-5-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6373.9,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-5-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7374.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-5-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-5-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8300.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-5-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8689.7,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-5-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9218.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-5-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9607.7,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-5-TEX-N-5D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9885.7,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-5-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>It&#39;s easy to check that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.221ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2749.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-644-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-644-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-644-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-644-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-644-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-644-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D439\" xlink:href=\"#MJX-644-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1138,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-644-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1582.7,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-644-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2360.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-644-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(F,+)<\/script> is an abelian group. And we call it the <strong>free abelian group<\/strong> on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.697ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 750 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-828-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" 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434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-646-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-646-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-646-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-646-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1772.6,0)\"><use data-c=\"1D439\" xlink:href=\"#MJX-646-TEX-I-1D439\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f\\in F<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.465ex\" height=\"2.406ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5067.7 1063.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.71ex;\"><defs><path id=\"MJX-647-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-647-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-647-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-647-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-647-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-647-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-647-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-647-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(1089,-285.4) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-647-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(529,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-647-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1196,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-647-TEX-I-1D434\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(2681.7,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-647-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3231.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-647-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3620.7,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-647-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4149.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-647-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4538.7,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-647-TEX-I-1D44E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum_{a\\in A} f(a)a<\/script>. <\/p>\n<p>For example, we can use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.266ex\" height=\"1.846ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 3653.6 816\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-648-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path id=\"MJX-648-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-648-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-648-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"32\" xlink:href=\"#MJX-648-TEX-N-32\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-648-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-648-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1687.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-648-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2688,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-648-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-648-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">2a_1-a_2<\/script> to denote <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"33.59ex\" height=\"7.692ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1950 14846.7 3400\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -3.281ex;\"><defs><path id=\"MJX-649-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-649-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-649-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-649-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-649-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><path id=\"MJX-649-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-649-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-649-TEX-N-21A6\" d=\"M95 155V109Q95 83 92 73T75 63Q61 63 58 74T54 130Q54 140 54 180T55 250Q55 421 57 425Q61 437 75 437Q88 437 91 428T95 393V345V270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><path id=\"MJX-649-TEX-S4-23A7\" d=\"M712 899L718 893V876V865Q718 854 704 846Q627 793 577 710T510 525Q510 524 509 521Q505 493 504 349Q504 345 504 334Q504 277 504 240Q504 -2 503 -4Q502 -8 494 -9T444 -10Q392 -10 390 -9Q387 -8 386 -5Q384 5 384 230Q384 262 384 312T383 382Q383 481 392 535T434 656Q510 806 664 892L677 899H712Z\"><\/path><path id=\"MJX-649-TEX-S4-23A9\" d=\"M718 -893L712 -899H677L666 -893Q542 -825 468 -714T385 -476Q384 -466 384 -282Q384 3 385 5L389 9Q392 10 444 10Q486 10 494 9T503 4Q504 2 504 -239V-310V-366Q504 -470 508 -513T530 -609Q546 -657 569 -698T617 -767T661 -812T699 -843T717 -856T718 -876V-893Z\"><\/path><path id=\"MJX-649-TEX-S4-23A8\" d=\"M389 1159Q391 1160 455 1160Q496 1160 498 1159Q501 1158 502 1155Q504 1145 504 924Q504 691 503 682Q494 549 425 439T243 259L229 250L243 241Q349 175 421 66T503 -182Q504 -191 504 -424Q504 -600 504 -629T499 -659H498Q496 -660 444 -660T390 -659Q387 -658 386 -655Q384 -645 384 -425V-282Q384 -176 377 -116T342 10Q325 54 301 92T255 155T214 196T183 222T171 232Q170 233 170 250T171 268Q171 269 191 284T240 331T300 407T354 524T383 679Q384 691 384 925Q384 1152 385 1155L389 1159Z\"><\/path><path id=\"MJX-649-TEX-S4-23AA\" d=\"M384 150V266Q384 304 389 309Q391 310 455 310Q496 310 498 309Q502 308 503 298Q504 283 504 150Q504 32 504 12T499 -9H498Q496 -10 444 -10T390 -9Q386 -8 385 2Q384 17 384 150Z\"><\/path><path id=\"MJX-649-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path id=\"MJX-649-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-649-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-649-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-649-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-649-TEX-N-2260\" d=\"M166 -215T159 -215T147 -212T141 -204T139 -197Q139 -190 144 -183L306 133H70Q56 140 56 153Q56 168 72 173H327L406 327H72Q56 332 56 347Q56 360 70 367H426Q597 702 602 707Q605 716 618 716Q625 716 630 712T636 703T638 696Q638 692 471 367H707Q722 359 722 347Q722 336 708 328L451 327L371 173H708Q722 163 722 153Q722 140 707 133H351Q175 -210 170 -212Q166 -215 159 -215Z\"><\/path><path id=\"MJX-649-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-649-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" 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xlink:href=\"#MJX-649-TEX-S4-23A7\" transform=\"translate(0,1051)\"><\/use><use data-c=\"23A9\" xlink:href=\"#MJX-649-TEX-S4-23A9\" transform=\"translate(0,-551)\"><\/use><use data-c=\"23A8\" xlink:href=\"#MJX-649-TEX-S4-23A8\" transform=\"translate(0,0)\"><\/use><svg width=\"889\" height=\"81\" y=\"1060\" x=\"0\" viewBox=\"0 14.3 889 81\"><use data-c=\"23AA\" xlink:href=\"#MJX-649-TEX-S4-23AA\" transform=\"scale(1,0.398)\"><\/use><\/svg><svg width=\"889\" height=\"81\" y=\"-641\" x=\"0\" viewBox=\"0 14.3 889 81\"><use data-c=\"23AA\" xlink:href=\"#MJX-649-TEX-S4-23AA\" transform=\"scale(1,0.398)\"><\/use><\/svg><\/g><g data-mml-node=\"mtable\" transform=\"translate(889,0)\"><g data-mml-node=\"mtr\" transform=\"translate(0,1200)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mn\"><use data-c=\"32\" xlink:href=\"#MJX-649-TEX-N-32\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2556,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(806.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-649-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1862.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-649-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2828.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,0)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-649-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-649-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1278,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2556,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(806.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-649-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1862.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-649-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2828.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-1200)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-649-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2556,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(806.8,0)\"><use data-c=\"2260\" xlink:href=\"#MJX-649-TEX-N-2260\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1862.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-649-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2828.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-649-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3272.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-649-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-649-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4238.3,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-649-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7961.3,0) translate(0 250)\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:A\\to \\mathbb Z,a\\mapsto\\begin{cases}2,&a=a_1,\\\\-1,&a=a_2,\\\\0,&a\\ne a_1,a_2.\\end{cases}<\/script><\/p>\n<p>We also use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"4.141ex\" height=\"1.967ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 1830.5 869.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-650-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><path id=\"MJX-650-TEX-N-2295\" d=\"M56 250Q56 394 156 488T384 583Q530 583 626 485T722 250Q722 110 625 14T390 -83Q249 -83 153 14T56 250ZM364 542Q308 539 251 509T148 418T96 278V270H369V542H364ZM681 278Q675 338 650 386T592 462T522 509T458 535T412 542H409V270H681V278ZM96 222Q104 150 139 95T219 12T302 -29T366 -42H369V230H96V222ZM681 222V230H409V-42H412Q429 -42 456 -36T521 -10T590 37T649 113T681 222Z\"><\/path><path id=\"MJX-650-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-650-TEX-D-2124\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(700,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2295\" xlink:href=\"#MJX-650-TEX-N-2295\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(778,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-650-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbb Z^{\\oplus A}<\/script> to denote the free abelian group on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.697ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 750 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-828-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D434\" xlink:href=\"#MJX-828-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">A<\/script>.<\/p>\n<\/blockquote>\n<p>The free abelian group has a universal property.<\/p>\n<blockquote><p><strong>1.2 Theorem (Universal Property).<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.697ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 750 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-828-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D434\" xlink:href=\"#MJX-828-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">A<\/script> be a set and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.695ex\" height=\"1.538ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -680 749 680\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-653-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-653-TEX-I-1D439\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">F<\/script> be the free abelian group on it.<\/p>\n<p><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.778ex\" height=\"1.645ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 786 727\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.05ex;\"><defs><path id=\"MJX-654-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D43A\" xlink:href=\"#MJX-654-TEX-I-1D43A\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">G<\/script> is an abelian group and there is a function <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.125ex\" height=\"2.084ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 4475.1 921\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-655-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-655-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-655-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-655-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-655-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-655-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-655-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-655-TEX-I-1D434\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2411.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-655-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3689.1,0)\"><use data-c=\"1D43A\" xlink:href=\"#MJX-655-TEX-I-1D43A\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:A\\to G<\/script>. Then there exists a unique group homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.17ex\" height=\"1.645ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4495.1 727\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.05ex;\"><defs><path id=\"MJX-656-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-656-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-656-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-656-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-656-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-656-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(848.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-656-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1404.6,0)\"><use data-c=\"1D439\" xlink:href=\"#MJX-656-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2431.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-656-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3709.1,0)\"><use data-c=\"1D43A\" xlink:href=\"#MJX-656-TEX-I-1D43A\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma:F\\to G<\/script> making diagram<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n36\" cid=\"n36\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.41ex\" height=\"13.106ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1408 6369.3 5793\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -9.921ex;\"><defs><path id=\"MJX-6-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 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310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-6-TEX-N-2203\" d=\"M56 661T56 674T70 694H487Q497 686 500 679V15Q497 10 487 1L279 0H70Q56 7 56 20T70 40H460V327H84Q70 334 70 347T84 367H460V654H70Q56 661 56 674Z\"><\/path><path id=\"MJX-6-TEX-N-21\" d=\"M78 661Q78 682 96 699T138 716T180 700T199 661Q199 654 179 432T158 206Q156 198 139 198Q121 198 119 206Q118 209 98 431T78 661ZM79 61Q79 89 97 105T141 121Q164 119 181 104T198 61Q198 31 181 16T139 1Q114 1 97 16T79 61Z\"><\/path><path id=\"MJX-6-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 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rotate(90) \"><path d=\"M0,0 Q-3.55,0.32 -7.82,2.35\"><\/path><path d=\"M0,0 Q-3.55,-0.32 -7.82,-2.35\"><\/path><\/g><g transform=\"translate(14.21,0) \"><\/g><g transform=\"translate(0,61.14) \"><\/g><g transform=\"translate(61.89,61.14) \"><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"-0.37499999999999994\" data-y=\"0.358\" data-xypic-id=\"0\" transform=\"translate(400,-108)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D434\" xlink:href=\"#MJX-6-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"1.8120240802453205\" data-y=\"-0.3991995308303615\" data-xypic-id=\"1\" transform=\"translate(2587,649.2)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-6-TEX-I-1D456\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"1.1663737986093012\" data-y=\"2.6676728849685167\" data-xypic-id=\"2\" transform=\"translate(1941.4,-2417.7)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-6-TEX-I-1D453\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"3.4935\" data-y=\"0.3400000000000001\" data-xypic-id=\"3\" transform=\"translate(4268.5,-90)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-6-TEX-I-1D439\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"4.2594213562373096\" data-y=\"2.160005140368258\" data-xypic-id=\"4\" transform=\"translate(5034.4,-1910)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"2203\" xlink:href=\"#MJX-6-TEX-N-2203\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(556,0)\"><use data-c=\"21\" xlink:href=\"#MJX-6-TEX-N-21\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(834,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-6-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"3.475\" data-y=\"4.162999999999999\" data-xypic-id=\"6\" transform=\"translate(4250,-3913)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D43A\" xlink:href=\"#MJX-6-TEX-I-1D43A\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commute, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"0.781ex\" height=\"1.52ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 345 672\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-839-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-839-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i<\/script>\u200b is the inclusion. And <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> is called <strong>extending by linearity<\/strong>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32.023ex\" height=\"2.36ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 14154.4 1043.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.663ex;\"><defs><path id=\"MJX-659-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-659-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-659-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-659-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-659-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><path id=\"MJX-659-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-659-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-659-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-659-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><path 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scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-659-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8383.1,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-659-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(9660.9,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-659-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-659-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(11210.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-659-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-659-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(11970.4,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-659-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12520.4,0)\"><use data-c=\"28\" xlink:href=\"#MJX-659-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(12909.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-659-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-659-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(13765.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-659-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma:F\\to G,\\sum_i c_ia_i\\mapsto \\sum_i c_if(a_i)<\/script>. It&#39;s easy to check that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>\u200b is a group homomorphism.<\/p>\n<p>Then let&#39;s prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> is unique.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.28ex\" height=\"1.35ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 1007.6 596.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-662-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-662-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-662-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-662-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_0<\/script> is another function fit the theorem. 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data-mml-node=\"mo\" transform=\"translate(4711.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-7-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5100.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-7-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5956.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-7-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,371.1)\"><g data-mml-node=\"mtd\" transform=\"translate(5012.1,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(5012.1,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-7-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-7-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-7-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(3704.2,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-7-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4254.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-7-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4643.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-7-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5499.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-7-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2071.1)\"><g data-mml-node=\"mtd\" transform=\"translate(5012.1,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(5012.1,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-7-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-7-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1904.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-7-TEX-N-28\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(2293.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-7-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(3904.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-7-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4664.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-7-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-7-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5520.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-7-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5909.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-7-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.588ex\" height=\"1.694ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -583 2912.1 748.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-663-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-663-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-663-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-663-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-663-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1285.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-663-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2341.1,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-663-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_0=\\sigma<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> is unique. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script>\u200b<\/p>\n<\/blockquote>\n<blockquote><p><strong>1.3 Definition.<\/strong><\/p>\n<p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.757ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2544.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-719-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-719-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-719-TEX-D-2115\" d=\"M20 664Q20 666 31 683H142Q256 683 258 681Q259 680 279 653T342 572T422 468L582 259V425Q582 451 582 490T583 541Q583 611 573 628T522 648Q500 648 493 654Q484 665 493 679L500 683H691Q702 676 702 666Q702 657 698 652Q688 648 680 648Q633 648 627 612Q624 601 624 294V-8Q616 -20 607 -20Q601 -20 596 -15Q593 -13 371 270L156 548L153 319Q153 284 153 234T152 167Q152 103 156 78T172 44T213 34Q236 34 242 28Q253 17 242 3L236 -1H36Q24 6 24 16Q24 34 56 34Q58 35 69 36T86 40T100 50T109 72Q111 83 111 345V603L96 619Q72 643 44 648Q20 648 20 664ZM413 419L240 648H120L136 628Q137 626 361 341T587 54L589 68Q589 78 589 121V192L413 419Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-719-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-719-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1822.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"2115\" xlink:href=\"#MJX-719-TEX-D-2115\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\in \\mathbb N<\/script>, the <strong>standard <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>\u200b-simplex<\/strong> is <\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n47\" cid=\"n47\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"56.293ex\" height=\"6.972ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1749.5 24881.4 3081.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -3.014ex;\"><defs><path id=\"MJX-8-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-8-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-8-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-8-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-8-TEX-S4-7B\" d=\"M661 -1243L655 -1249H622L604 -1240Q503 -1190 434 -1107T348 -909Q346 -897 346 -499L345 -98L343 -82Q335 3 287 87T157 223Q146 232 145 236Q144 240 144 250Q144 265 145 268T157 278Q242 333 288 417T343 583L345 600L346 1001Q346 1398 348 1410Q379 1622 600 1739L622 1750H655L661 1744V1727V1721Q661 1712 661 1710T657 1705T648 1700T630 1690T602 1668Q589 1659 574 1643T531 1593T484 1508T459 1398Q458 1389 458 1001Q458 614 457 605Q441 435 301 316Q254 277 202 251L250 222Q260 216 301 185Q443 66 457 -104Q458 -113 458 -501Q458 -888 459 -897Q463 -944 478 -988T509 -1060T548 -1114T580 -1149T602 -1167Q620 -1183 634 -1192T653 -1202T659 -1207T661 -1220V-1226V-1243Z\"><\/path><path id=\"MJX-8-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-8-TEX-I-1D461\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path id=\"MJX-8-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-8-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-8-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-8-TEX-N-2026\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z\"><\/path><path id=\"MJX-8-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-8-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-8-TEX-D-211D\" d=\"M17 665Q17 672 28 683H221Q415 681 439 677Q461 673 481 667T516 654T544 639T566 623T584 607T597 592T607 578T614 565T618 554L621 548Q626 530 626 497Q626 447 613 419Q578 348 473 326L455 321Q462 310 473 292T517 226T578 141T637 72T686 35Q705 30 705 16Q705 7 693 -1H510Q503 6 404 159L306 310H268V183Q270 67 271 59Q274 42 291 38Q295 37 319 35Q344 35 353 28Q362 17 353 3L346 -1H28Q16 5 16 16Q16 35 55 35Q96 38 101 52Q106 60 106 341T101 632Q95 645 55 648Q17 648 17 665ZM241 35Q238 42 237 45T235 78T233 163T233 337V621L237 635L244 648H133Q136 641 137 638T139 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data-c=\"2211\" xlink:href=\"#MJX-8-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(124.5,-1087.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-8-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(412,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-8-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1190,0)\"><use data-c=\"30\" xlink:href=\"#MJX-8-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(509.9,1150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-8-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(18276.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-8-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"1D457\" xlink:href=\"#MJX-8-TEX-I-1D457\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(19289.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-8-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(20345.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-8-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(20845.6,0) translate(0 -0.5)\"><use data-c=\"7D\" xlink:href=\"#MJX-8-TEX-S4-7D\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(24603.4,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-8-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>We can see their graphs in this picture: <\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/ncatlab.org\/nlab\/files\/TopologicalSimplices.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/ncatlab.org\/nlab\/files\/TopologicalSimplices.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=60%\/><\/div><\/p>\n<p>We can denote <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.032ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 1340.3 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1036-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 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353Z\"><\/path><path id=\"MJX-669-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-669-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-669-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-669-TEX-N-2026\" d=\"M78 60Q78 84 95 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fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"5B\" xlink:href=\"#MJX-669-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(278,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-669-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-669-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1180.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-669-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1625.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-669-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-669-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2527.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-669-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2972.4,0)\"><use data-c=\"2026\" xlink:href=\"#MJX-669-TEX-N-2026\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4311.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-669-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4755.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-669-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-669-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5729,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-669-TEX-N-5D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">[e_0,e_1,\\dots,e_n]<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.333ex\" height=\"1.439ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 5451 636\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-670-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-670-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-670-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-670-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-670-TEX-N-2026\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z\"><\/path><path id=\"MJX-670-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-670-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-670-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(902.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-670-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1347.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-670-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-670-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2249.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-670-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2694.4,0)\"><use data-c=\"2026\" xlink:href=\"#MJX-670-TEX-N-2026\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4033.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-670-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4477.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-670-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-670-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">e_0,e_1,\\dots,e_n<\/script> are vertices of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.032ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 1340.3 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1036-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1036-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1036-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1036-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n<\/script>\u200b.<\/p>\n<p>Sometimes, we will see <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.872ex\" height=\"1.887ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 1269.6 833.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-964-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-964-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-964-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-964-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^1<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.14ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 504 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-965-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D43C\" xlink:href=\"#MJX-965-TEX-I-1D43C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">I<\/script> with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.633ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5583.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-674-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-674-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-674-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-674-TEX-I-1D461\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path id=\"MJX-674-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-674-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-674-TEX-N-21A6\" d=\"M95 155V109Q95 83 92 73T75 63Q61 63 58 74T54 130Q54 140 54 180T55 250Q55 421 57 425Q61 437 75 437Q88 437 91 428T95 393V345V270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-674-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(389,0)\"><use data-c=\"31\" xlink:href=\"#MJX-674-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1111.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-674-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2111.4,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-674-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2472.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-674-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2917.1,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-674-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3278.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-674-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3944.9,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-674-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5222.7,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-674-TEX-I-1D461\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(1-t,t)\\mapsto t<\/script>.<\/p>\n<\/blockquote>\n<p>When we perform integrations on some geometric shapes, these shapes often have an orientation. Similarly, we can also define an orientation for simplices.<\/p>\n<blockquote><p><strong>1.4 Definition.<\/strong><\/p>\n<p>An <strong>orientation<\/strong> of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"19.64ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8680.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-675-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-675-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-675-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-675-TEX-N-5B\" d=\"M118 -250V750H255V710H158V-210H255V-250H118Z\"><\/path><path id=\"MJX-675-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-675-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-675-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-675-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-675-TEX-N-2026\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z\"><\/path><path id=\"MJX-675-TEX-N-5D\" d=\"M22 710V750H159V-250H22V-210H119V710H22Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-675-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-675-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1618,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-675-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2673.8,0)\"><use data-c=\"5B\" xlink:href=\"#MJX-675-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2951.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-675-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-675-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3854.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-675-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4299,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-675-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-675-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5201.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-675-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5646.3,0)\"><use data-c=\"2026\" xlink:href=\"#MJX-675-TEX-N-2026\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6984.9,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-675-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7429.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-675-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-675-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8402.9,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-675-TEX-N-5D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n=[e_0,e_1,\\dots,e_n]<\/script> is a linear ordering of its vertices.<\/p>\n<p>An orientation thus gives a tour of the vertices. For example, the orientation <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.16ex\" height=\"1.596ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -540 5374.8 705.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-676-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-676-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-676-TEX-N-3C\" d=\"M694 -11T694 -19T688 -33T678 -40Q671 -40 524 29T234 166L90 235Q83 240 83 250Q83 261 91 266Q664 540 678 540Q681 540 687 534T694 519T687 505Q686 504 417 376L151 250L417 124Q686 -4 687 -5Q694 -11 694 -19Z\"><\/path><path id=\"MJX-676-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-676-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-676-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-676-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1180.3,0)\"><use data-c=\"3C\" xlink:href=\"#MJX-676-TEX-N-3C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2236.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-676-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-676-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3416.4,0)\"><use data-c=\"3C\" xlink:href=\"#MJX-676-TEX-N-3C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4472.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-676-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-676-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">e_0<e_1<e_2<\/script> of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.872ex\" height=\"1.887ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 1269.6 833.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1116-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1116-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1116-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-1116-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^2<\/script> gives a  counterclockwise tour.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/orientation.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/orientation.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=25%\/><\/div><\/p>\n<p>Two orientations of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.032ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 1340.3 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1036-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1036-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1036-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1036-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n<\/script> are the <strong>same<\/strong> if, as permutations of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.595ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6451 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-679-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-679-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-679-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-679-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-679-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-679-TEX-N-2026\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z\"><\/path><path id=\"MJX-679-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-679-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-679-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-679-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-679-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1402.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-679-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1847.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-679-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-679-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2749.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-679-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3194.4,0)\"><use data-c=\"2026\" xlink:href=\"#MJX-679-TEX-N-2026\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4533.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-679-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4977.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-679-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-679-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5951,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-679-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{e_0,e_1,\\dots,e_n\\}<\/script>, they have the same parity (i.e., both are even or both are odd); otherwise the orientations are <strong>opposite<\/strong>.<\/p>\n<\/blockquote>\n<blockquote><p><strong>1.5 Definition.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> be a topological space, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-982-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-982-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-982-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-982-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-982-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-982-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 0<\/script>. A <strong>(singular) <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex<\/strong> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is a continuous function <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.609ex\" height=\"2.084ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 5131.4 921\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-684-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-684-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-684-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-684-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-684-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-684-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-684-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-684-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1383.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-684-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-684-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3001.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-684-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4279.4,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-684-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:\\Delta^n\\to X<\/script>.<\/p>\n<p><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.222ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2750.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-693-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-693-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-693-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-693-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-693-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-693-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-693-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-693-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-693-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2361.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-693-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n(X)<\/script> denotes the free abelian group generated by all singular <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplices in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>\u200b; and we define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.815ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4780.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-688-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-688-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-688-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-688-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-688-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-688-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-688-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-688-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45A\" xlink:href=\"#MJX-688-TEX-I-1D45A\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1316.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-688-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1705.8,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-688-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2557.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-688-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3224.6,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-688-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4280.4,0)\"><use data-c=\"30\" xlink:href=\"#MJX-688-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_m(X)=0<\/script> for all integers <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.135ex\" height=\"1.597ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2711.6 706\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-689-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-689-TEX-N-3C\" d=\"M694 -11T694 -19T688 -33T678 -40Q671 -40 524 29T234 166L90 235Q83 240 83 250Q83 261 91 266Q664 540 678 540Q681 540 687 534T694 519T687 505Q686 504 417 376L151 250L417 124Q686 -4 687 -5Q694 -11 694 -19Z\"><\/path><path id=\"MJX-689-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-689-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1155.8,0)\"><use data-c=\"3C\" xlink:href=\"#MJX-689-TEX-N-3C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2211.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-689-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">m<0<\/script>.<\/p>\n<p>And we call an element in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.222ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2750.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-693-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-693-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-693-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-693-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-693-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-693-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-693-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-693-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-693-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2361.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-693-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n(X)<\/script> is an <strong><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-chain<\/strong> on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>.<\/p>\n<\/blockquote>\n<p>Let&#39;s consider what the elements in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.222ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2750.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-693-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-693-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-693-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-693-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-693-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-693-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-693-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-693-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-693-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2361.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-693-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n(X)<\/script> are.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.264ex\" height=\"2.36ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3652.5 1043.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.663ex;\"><defs><path id=\"MJX-703-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-703-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-703-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-703-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-703-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1549.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-703-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2754.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-703-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum_i m_i\\sigma_i<\/script> be an <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-chain, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.001ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 3094.5 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-780-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-780-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-780-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-780-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-780-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-780-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1482.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-780-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(2427.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-780-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">m_i\\in \\mathbb Z<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.397ex\" height=\"1.977ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 5479.3 873.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-697-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-697-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-697-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-697-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-697-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-697-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-697-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-697-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-697-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1175.7,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-697-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1731.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-697-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-697-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3349.5,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-697-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4627.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-697-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i:\\Delta^n\\to X<\/script> is continuous. We can regard <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.032ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 898 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1183-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1183-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1183-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1183-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i<\/script> as a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-dimensional geometric shape on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> (this may not be accurate), and the sign of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.726ex\" height=\"1.357ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1205 599.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-701-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-701-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-701-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-701-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">m_i<\/script> denote the orientation of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.912ex\" height=\"1.486ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -441 845 657\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-702-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-702-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-702-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-702-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma_i<\/script>. Then we can consider <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.264ex\" height=\"2.36ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3652.5 1043.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.663ex;\"><defs><path id=\"MJX-703-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-703-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-703-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-703-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-703-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1549.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-703-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2754.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-703-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-703-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum_i m_i\\sigma_i<\/script> as a combination of some <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-dimensional geometric shapes on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>.<\/p>\n<p>How to use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-chains to describe holes in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>?<\/p>\n<p>When X is a plane with some holes, we can notice that the holes in the plane can be surrounded by a 1-chain, whose simplices precisely form some &quot;closed curves&quot;.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/1-chain.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/1-chain.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=25%\/><\/div><\/p>\n<p>Therefore, we need a method to find &quot;closed curves&quot; and try to use them to describe holes.<\/p>\n<p>As we can see, &quot;closed curves&quot; have no boundary while &quot;open curves&quot; always have at least two points as its boundary.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/open_curves.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/open_curves.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=35%\/><\/div><\/p>\n<p>Thus, we need to describe the boundary of an <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path 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<strong><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"0.781ex\" height=\"1.52ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 345 672\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-839-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" 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xlink:href=\"#MJX-9-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(7006.4,0)\"><use data-c=\"30\" xlink:href=\"#MJX-9-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7506.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-9-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7951.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-9-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-9-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8639,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-9-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9083.7,0)\"><use data-c=\"2026\" xlink:href=\"#MJX-9-TEX-N-2026\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10422.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-9-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(10867,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-9-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(394,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-9-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-9-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-9-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12639,0)\"><use data-c=\"29\" xlink:href=\"#MJX-9-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(13028,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-9-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<p>We can consider that the usage of these maps is to take out the face opposite to the <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"0.781ex\" height=\"1.52ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 345 672\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-839-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-839-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i<\/script>-th vertex in the n-simplex. With these maps, we can define the boundary of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-chains.<\/p>\n<blockquote><p><strong>1.7 Definition.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.657ex\" height=\"1.645ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 5152.4 727\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-713-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-713-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-713-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-713-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-713-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-713-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-713-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(848.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-713-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1404.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-713-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-713-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3022.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-713-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4300.4,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-713-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma:\\Delta^n\\to X<\/script> is continuous and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.597ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 706\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-1085-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1085-TEX-N-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path id=\"MJX-1085-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1085-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3E\" xlink:href=\"#MJX-1085-TEX-N-3E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1085-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n>0<\/script>, then its <strong>boundary<\/strong> is<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n81\" cid=\"n81\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"30.472ex\" height=\"6.354ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1562.5 13468.5 2808.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.819ex;\"><defs><path id=\"MJX-10-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-10-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-10-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-10-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-10-TEX-LO-2211\" d=\"M60 948Q63 950 665 950H1267L1325 815Q1384 677 1388 669H1348L1341 683Q1320 724 1285 761Q1235 809 1174 838T1033 881T882 898T699 902H574H543H251L259 891Q722 258 724 252Q725 250 724 246Q721 243 460 -56L196 -356Q196 -357 407 -357Q459 -357 548 -357T676 -358Q812 -358 896 -353T1063 -332T1204 -283T1307 -196Q1328 -170 1348 -124H1388Q1388 -125 1381 -145T1356 -210T1325 -294L1267 -449L666 -450Q64 -450 61 -448Q55 -446 55 -439Q55 -437 57 -433L590 177Q590 178 557 222T452 366T322 544L56 909L55 924Q55 945 60 948Z\"><\/path><path id=\"MJX-10-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-10-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-10-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 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transform=\"translate(7340.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-10-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,413) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-10-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-247) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-10-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8591.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-10-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9536.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-10-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-10-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-10-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-10-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11560.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-10-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(11949.5,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-10-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12801.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-10-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(13190.5,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-10-TEX-N-3B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>if <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.692ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 748\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.186ex;\"><defs><path id=\"MJX-1042-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1042-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1042-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1042-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1042-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1042-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n=0<\/script>, define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.629ex\" height=\"1.992ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 3372.1 880.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-716-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-716-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-716-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-716-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-716-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-716-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(967.6,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-716-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1816.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-716-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2872.1,0)\"><use data-c=\"30\" xlink:href=\"#MJX-716-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_0\\sigma=0<\/script>\u200b\u200b.<\/p>\n<p>As shown in the following figure, defining the boundary in this way is consistent with our geometric intuition.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/boundary.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/boundary.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=80%\/><\/div><\/p>\n<p>Then we extend <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.349ex\" height=\"1.975ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 1038.3 872.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-766-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-766-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-766-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-766-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n<\/script> by linearity, and hence we get a group homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.243ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9831.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-718-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-718-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-718-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-718-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-718-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-718-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-718-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-718-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-718-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-718-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-718-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-718-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1316,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-718-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1871.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-718-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-718-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2992.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-718-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3381.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-718-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4233.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-718-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4899.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-718-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6177.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-718-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-718-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-718-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-718-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8201.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-718-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8590.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-718-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9442.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-718-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n:S_n(X)\\to S_{n-1}(X)<\/script>, for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.757ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2544.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-719-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-719-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-719-TEX-D-2115\" d=\"M20 664Q20 666 31 683H142Q256 683 258 681Q259 680 279 653T342 572T422 468L582 259V425Q582 451 582 490T583 541Q583 611 573 628T522 648Q500 648 493 654Q484 665 493 679L500 683H691Q702 676 702 666Q702 657 698 652Q688 648 680 648Q633 648 627 612Q624 601 624 294V-8Q616 -20 607 -20Q601 -20 596 -15Q593 -13 371 270L156 548L153 319Q153 284 153 234T152 167Q152 103 156 78T172 44T213 34Q236 34 242 28Q253 17 242 3L236 -1H36Q24 6 24 16Q24 34 56 34Q58 35 69 36T86 40T100 50T109 72Q111 83 111 345V603L96 619Q72 643 44 648Q20 648 20 664ZM413 419L240 648H120L136 628Q137 626 361 341T587 54L589 68Q589 78 589 121V192L413 419Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-719-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-719-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1822.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"2115\" xlink:href=\"#MJX-719-TEX-D-2115\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\in \\mathbb N<\/script>. The homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.349ex\" height=\"1.975ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 1038.3 872.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-766-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-766-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-766-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-766-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n<\/script>\u200b are called <strong>boundary operators<\/strong>.<\/p>\n<p>Strictly speaking, we ought to write <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.948ex\" height=\"2.49ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 1303.2 1100.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path id=\"MJX-721-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-721-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-721-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-721-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(650.8,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-721-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-721-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n^X<\/script> instead of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.349ex\" height=\"1.975ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 1038.3 872.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-766-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-766-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-766-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-766-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n<\/script> since these homomorphisms do depend on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>\u200b\u200b; however, this is rarely done.<\/p>\n<p>For each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, we have constructed a sequence of free abelia groups and homomorphisms<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n88\" cid=\"n88\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container 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xlink:href=\"#MJX-11-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-11-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-11-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"29.68434725549422\" data-y=\"-0.5084873734152917\" data-xypic-id=\"8\" transform=\"translate(30670.3,758.5)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-11-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-11-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"32.12131738496681\" data-y=\"0.32200000000000006\" data-xypic-id=\"9\" transform=\"translate(33107.3,-72)\"><g 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643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>; it is denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.109ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4468.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-726-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-726-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-726-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-726-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-726-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-726-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-726-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-726-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-726-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-726-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1438.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-726-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1827.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-726-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2679.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-726-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3068.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-726-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3513.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-726-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4079.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-726-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(S_*(X),\\partial)<\/script> or, more simply, by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.062ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2679.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-856-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-856-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-856-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-856-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-856-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-856-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-856-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-856-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-856-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-856-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*(X)<\/script>.<\/p>\n<\/blockquote>\n<p>Then, we can find all &quot;closed curves&quot;.<\/p>\n<blockquote><p><strong>1.8 Definition.<\/strong><\/p>\n<p>The group of <strong>(singular) <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-cycles<\/strong> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.381ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2820.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-730-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-730-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-730-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-730-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-730-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-730-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-730-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-730-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1579.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-730-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2431.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-730-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_n(X)<\/script>, is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.812ex\" height=\"1.975ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 2568.9 872.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-731-TEX-N-6B\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T97 124T98 167T98 217T98 272T98 329Q98 366 98 407T98 482T98 542T97 586T97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V463L180 233L240 287Q300 341 304 347Q310 356 310 364Q310 383 289 385H284V431H293Q308 428 412 428Q475 428 484 431H489V385H476Q407 380 360 341Q286 278 286 274Q286 273 349 181T420 79Q434 60 451 53T500 46H511V0H505Q496 3 418 3Q322 3 307 0H299V46H306Q330 48 330 65Q330 72 326 79Q323 84 276 153T228 222L176 176V120V84Q176 65 178 59T189 49Q210 46 238 46H254V0H246Q231 3 137 3T28 0H20V46H36Z\"><\/path><path id=\"MJX-731-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-731-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-731-TEX-N-2061\" d=\"\"><\/path><path id=\"MJX-731-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-731-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"6B\" xlink:href=\"#MJX-731-TEX-N-6B\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-731-TEX-N-65\" transform=\"translate(528,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-731-TEX-N-72\" transform=\"translate(972,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1364,0)\"><use data-c=\"2061\" xlink:href=\"#MJX-731-TEX-N-2061\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1530.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-731-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-731-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\ker \\partial_n<\/script>.<\/p>\n<\/blockquote>\n<p>Although we can find all &quot;closed curves&quot; in a plane <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, we still can&#39;t describe holes in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>. We can note that the holes in the plane can be surrounded by 1-chains, but cannot be covered by 2-chains.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/circles.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/circles.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=70%\/><\/div><\/p>\n<p>Therefore, we know that there are some &quot;closed curves&quot;, boundaries of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1167-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"32\" xlink:href=\"#MJX-1167-TEX-N-32\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">2<\/script>-chains, surrounding no holes!<\/p>\n<blockquote><p><strong>1.9 Definition.<\/strong><\/p>\n<p>The group of <strong>(singular) <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-boundaries<\/strong> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.553ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2896.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-737-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-737-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-737-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-737-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-737-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-737-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-737-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-737-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1655.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-737-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2507.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-737-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_n(X)<\/script>, is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.284ex\" height=\"2.088ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 3219.6 923\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.471ex;\"><defs><path id=\"MJX-738-TEX-N-69\" d=\"M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z\"><\/path><path id=\"MJX-738-TEX-N-6D\" d=\"M41 46H55Q94 46 102 60V68Q102 77 102 91T102 122T103 161T103 203Q103 234 103 269T102 328V351Q99 370 88 376T43 385H25V408Q25 431 27 431L37 432Q47 433 65 434T102 436Q119 437 138 438T167 441T178 442H181V402Q181 364 182 364T187 369T199 384T218 402T247 421T285 437Q305 442 336 442Q351 442 364 440T387 434T406 426T421 417T432 406T441 395T448 384T452 374T455 366L457 361L460 365Q463 369 466 373T475 384T488 397T503 410T523 422T546 432T572 439T603 442Q729 442 740 329Q741 322 741 190V104Q741 66 743 59T754 49Q775 46 803 46H819V0H811L788 1Q764 2 737 2T699 3Q596 3 587 0H579V46H595Q656 46 656 62Q657 64 657 200Q656 335 655 343Q649 371 635 385T611 402T585 404Q540 404 506 370Q479 343 472 315T464 232V168V108Q464 78 465 68T468 55T477 49Q498 46 526 46H542V0H534L510 1Q487 2 460 2T422 3Q319 3 310 0H302V46H318Q379 46 379 62Q380 64 380 200Q379 335 378 343Q372 371 358 385T334 402T308 404Q263 404 229 370Q202 343 195 315T187 232V168V108Q187 78 188 68T191 55T200 49Q221 46 249 46H265V0H257L234 1Q210 2 183 2T145 3Q42 3 33 0H25V46H41Z\"><\/path><path id=\"MJX-738-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-738-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-738-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-738-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"69\" xlink:href=\"#MJX-738-TEX-N-69\"><\/use><use data-c=\"6D\" xlink:href=\"#MJX-738-TEX-N-6D\" transform=\"translate(278,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1277.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-738-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(564,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-738-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-738-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-738-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\operatorname{im} \\partial_{n+1}<\/script>.<\/p>\n<\/blockquote>\n<p>Wait, are <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-boundaries really <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-cycles?<\/p>\n<blockquote><p><strong>1.10 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"4.73ex\" height=\"1.957ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 2090.6 865\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-741-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-741-TEX-N-3C\" d=\"M694 -11T694 -19T688 -33T678 -40Q671 -40 524 29T234 166L90 235Q83 240 83 250Q83 261 91 266Q664 540 678 540Q681 540 687 534T694 519T687 505Q686 504 417 376L151 250L417 124Q686 -4 687 -5Q694 -11 694 -19Z\"><\/path><path id=\"MJX-741-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-741-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(689.8,0)\"><use data-c=\"3C\" xlink:href=\"#MJX-741-TEX-N-3C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1745.6,0)\"><use data-c=\"1D456\" xlink:href=\"#MJX-741-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j<i<\/script>, the face maps satisfy<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n104\" cid=\"n104\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"33.738ex\" height=\"2.988ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -883.9 14912.4 1320.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.988ex;\"><defs><path id=\"MJX-12-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-12-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-12-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-12-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-12-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-12-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-12-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-12-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-12-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-12-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-12-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-12-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-12-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(499,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-12-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-12-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-292.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-12-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1876.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-12-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,413) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-247) scale(0.707)\"><use data-c=\"1D457\" xlink:href=\"#MJX-12-TEX-I-1D457\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3128,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-12-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(4183.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-12-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(499,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-12-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-12-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-292.4) scale(0.707)\"><use data-c=\"1D457\" xlink:href=\"#MJX-12-TEX-I-1D457\"><\/use><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6060.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-12-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,413) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(499,-247) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-12-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-12-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"31\" xlink:href=\"#MJX-12-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8035.1,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-12-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(8590.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-12-TEX-N-394\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(866,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-12-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-12-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11112.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-12-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(12390.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-12-TEX-N-394\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(866,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-12-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-12-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-12-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14634.4,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-12-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>It&#39;s easy to prove by using the definition of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.202ex\" height=\"2.207ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -675.5 973.3 975.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.679ex;\"><defs><path id=\"MJX-742-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-742-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-742-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-742-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-742-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-292.2) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-742-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varepsilon_i^n<\/script>.<\/p>\n<\/blockquote>\n<blockquote><p><strong>1.11 Theorem.<\/strong><\/p>\n<p>For all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.891ex\" height=\"2.088ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 4813.8 923\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.471ex;\"><defs><path id=\"MJX-764-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-764-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-764-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-764-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-764-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-764-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-764-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-764-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1038.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-764-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(564,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-764-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-764-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-764-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3258,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-764-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4313.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-764-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n\\partial_{n+1}=0<\/script>; and thus <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.95ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7050.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-745-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-745-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-745-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-745-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-745-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-745-TEX-N-2282\" d=\"M84 250Q84 372 166 450T360 539Q361 539 370 539T395 539T430 540T475 540T524 540H679Q694 532 694 520Q694 511 681 501L522 500H470H441Q366 500 338 496T266 472Q244 461 224 446T179 404T139 337T124 250V245Q124 157 185 89Q244 25 328 7Q348 2 366 2T522 0H681Q694 -10 694 -20Q694 -32 679 -40H526Q510 -40 480 -40T434 -41Q350 -41 289 -25T172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-745-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-745-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-745-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-745-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1655.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-745-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2507.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-745-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3174,0)\"><use data-c=\"2282\" xlink:href=\"#MJX-745-TEX-N-2282\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4229.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-745-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-745-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5420.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-745-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5809.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-745-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6661.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-745-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_n(X)\\subset Z_n(X)<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.267ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3653.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-746-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-746-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-746-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-746-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-746-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-746-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-746-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-746-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-746-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-746-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-746-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2023.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-746-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2412.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-746-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3264.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-746-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_{n+1}(X)<\/script> is generated by all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.015ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3100.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-747-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-747-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 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749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-747-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-747-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1211.2,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-747-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2211.4,0)\"><use data-c=\"31\" xlink:href=\"#MJX-747-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2711.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-747-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(n+1)<\/script>-simplices <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>, it suffices to show that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg 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401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-749-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-749-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-749-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-749-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1132,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-749-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1980.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-749-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3036.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-749-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\partial\\sigma=0<\/script> for each such <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path 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xlink:href=\"#MJX-13-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(21191.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-13-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-13-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(21984.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-13-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D457\" xlink:href=\"#MJX-13-TEX-I-1D457\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(22825,0)\"><use data-c=\"29\" xlink:href=\"#MJX-13-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-13167.8)\"><g data-mml-node=\"mtd\" transform=\"translate(1703,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(1703,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-13-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1333.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-13-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(1833.6,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-13-TEX-N-A0\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2083.6,0)\"><use data-c=\"25FB\" xlink:href=\"#MJX-13-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<p>Eventually, we can describe holes by using the quotient group.<\/p>\n<blockquote><p><strong>1.12 Definition.<\/strong><\/p>\n<p>For each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>, the <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-th <strong>(singular) homology group<\/strong> of a space <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 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xlink:href=\"#MJX-14-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>The coset <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.518ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5091 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-754-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-754-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-754-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-754-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 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284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-754-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-754-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1194.5,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-754-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2194.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-754-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-754-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3461,0)\"><use data-c=\"28\" xlink:href=\"#MJX-754-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3850,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-754-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4702,0)\"><use data-c=\"29\" xlink:href=\"#MJX-754-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z_n+B_n(X)<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.2ex\" height=\"1.357ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 972.3 599.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-757-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-757-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-757-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-757-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z_n<\/script> is an <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-cycle, is called the <strong>homology class<\/strong> of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.2ex\" height=\"1.357ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 972.3 599.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-757-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-757-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-757-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-757-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z_n<\/script>, and it is denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.102ex\" height=\"1.927ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 2254.9 851.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-758-TEX-N-63\" d=\"M370 305T349 305T313 320T297 358Q297 381 312 396Q317 401 317 402T307 404Q281 408 258 408Q209 408 178 376Q131 329 131 219Q131 137 162 90Q203 29 272 29Q313 29 338 55T374 117Q376 125 379 127T395 129H409Q415 123 415 120Q415 116 411 104T395 71T366 33T318 2T249 -11Q163 -11 99 53T34 214Q34 318 99 383T250 448T370 421T404 357Q404 334 387 320Z\"><\/path><path id=\"MJX-758-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-758-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><path id=\"MJX-758-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-758-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"63\" xlink:href=\"#MJX-758-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-758-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-758-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1282.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-758-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-758-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\operatorname{cls} z_n<\/script>.<\/p>\n<\/blockquote>\n<h2 id='2-functorialities-of--\ud835\udc46-\u2217--and--\ud835\udc3b-\ud835\udc5b'>2. Functorialities of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.375ex\" height=\"1.878ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1049.6 830.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-851-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-851-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-851-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-851-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 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130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script><\/h2>\n<p>When we view <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.375ex\" height=\"1.878ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1049.6 830.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-851-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-851-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 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type=\"math\/tex\">S_*<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script>\u200b from the perspective of category theory, we can find that they are actually functors.<\/p>\n<blockquote><p><strong>2.1 Definition.<\/strong><\/p>\n<p>A <strong>(chain) complex<\/strong> is a sequence of abelian groups and homomorphisms<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n123\" cid=\"n123\" 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stroke=\"currentColor\" fill=\"currentColor\" data-x=\"8.911946535068335\" data-y=\"0.273610912703474\" data-xypic-id=\"3\" transform=\"translate(9897.9,-23.6)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-15-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-15-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"11.543049438545095\" data-y=\"-0.5029873734152918\" data-xypic-id=\"4\" transform=\"translate(12529,753)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-15-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-15-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"13.234210603780264\" data-y=\"0.24850862197135157\" data-xypic-id=\"5\" transform=\"translate(14220.2,1.5)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-15-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-15-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-15-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-15-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"18.460157138848597\" data-y=\"0.25\" data-xypic-id=\"6\" transform=\"translate(19446.2,0)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"22EF\" xlink:href=\"#MJX-15-TEX-N-22EF\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.632ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2489.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-765-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-765-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-765-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-765-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-765-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1822.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-765-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\in \\mathbb Z<\/script>, such that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.891ex\" height=\"2.088ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 4813.8 923\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.471ex;\"><defs><path id=\"MJX-764-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-764-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-764-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-764-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-764-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-764-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-764-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-764-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1038.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-764-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(564,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-764-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-764-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-764-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3258,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-764-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4313.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-764-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n\\partial_{n+1}=0<\/script> for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.632ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2489.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-765-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-765-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-765-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-765-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-765-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1822.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-765-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\in \\mathbb Z<\/script>. The homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.349ex\" height=\"1.975ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 1038.3 872.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-766-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-766-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-766-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-766-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_n<\/script> is called the <strong>differentiation<\/strong> of <strong>degree<\/strong> <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.765ex\" height=\"1.952ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1222.3 862.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-768-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-768-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-768-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-768-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">C_n<\/script> is called the <strong>term<\/strong> of <strong>degree<\/strong> <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>.<\/p>\n<p>The complex above is denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.652ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2940.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-807-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-807-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-807-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-807-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-807-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-807-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-807-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-807-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-807-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1540.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-807-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1985.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-807-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2551.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-807-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(C_*,\\partial)<\/script> or, more simply, by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.605ex\" height=\"1.878ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1151.6 830.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-771-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-771-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-771-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-771-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">C_*<\/script>. <\/p>\n<\/blockquote>\n<blockquote><p><strong>2.2 Definition.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.652ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2940.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-807-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-807-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-807-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-807-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-807-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-807-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-807-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-807-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-807-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1540.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-807-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1985.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-807-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2551.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-807-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(C_*,\\partial)<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.397ex\" height=\"2.283ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 3269.4 1009\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-773-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-773-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-773-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><path id=\"MJX-773-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-773-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-773-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-773-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-773-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(389,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-773-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-773-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-773-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1540.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-773-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1985.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-773-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(650.8,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-773-TEX-V-2032\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2880.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-773-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(C'_*,\\partial')<\/script> are complexes, a <strong>chain map<\/strong> <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.699ex\" height=\"2.283ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 9148.8 1009\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-774-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-774-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-774-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-774-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-774-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-774-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-774-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-774-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-774-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-774-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-774-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-774-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1383.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-774-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1772.6,0)\"><g data-mml-node=\"mi\"><use 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data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-774-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-774-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7419.9,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-774-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(7864.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-774-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(650.8,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-774-TEX-V-2032\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8759.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-774-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:(C_*,\\partial)\\to(C_*',\\partial')<\/script> is a sequence of homomorphisms <mjx-container class=\"MathJax\" 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data-mml-node=\"mi\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-775-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3830.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-775-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(5108.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-775-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-775-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-775-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6330.9,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-775-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{f_n:C_n\\to C_n'\\}<\/script> such that the diagram<\/p>\n<div contenteditable=\"false\" 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data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-16-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-16-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-257.5) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-16-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-16-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-16-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"18.460157138848597\" data-y=\"4.343736417129139\" data-xypic-id=\"16\" transform=\"translate(19446.2,-4093.7)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"22EF\" xlink:href=\"#MJX-16-TEX-N-22EF\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commutes.<\/p>\n<\/blockquote>\n<blockquote><p><strong>2.3 Theorem.<\/strong><\/p>\n<p>All complexes and chain maps form a category, denoted by <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.794ex\" height=\"2.016ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -697 3003 891\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-776-TEX-B-1D402\" d=\"M64 343Q64 502 174 599T468 697Q502 697 533 691T586 674T623 655T647 639T657 632L694 663Q703 670 711 677T723 687T730 692T735 695T740 696T746 697Q759 697 762 692T766 668V627V489V449Q766 428 762 424T742 419H732H720Q699 419 697 436Q690 498 657 545Q611 618 532 632Q522 634 496 634Q356 634 286 553Q232 488 232 343T286 133Q355 52 497 52Q597 52 650 112T704 237Q704 248 709 251T729 254H735Q750 254 755 253T763 248T766 234Q766 136 680 63T469 -11Q285 -11 175 86T64 343Z\"><\/path><path id=\"MJX-776-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-776-TEX-B-1D426\" d=\"M40 442Q217 450 218 450H224V365Q226 367 235 378T254 397T278 416T314 435T362 448Q376 450 400 450H406Q503 450 534 393Q545 376 545 370Q545 368 555 379Q611 450 716 450Q774 450 809 434Q850 414 861 379T873 276V213V198V62H942V0H933Q915 3 809 3Q702 3 684 0H675V62H744V194V275Q744 348 735 373T690 399Q645 399 607 370T557 290Q555 281 554 171V62H623V0H614Q596 3 489 3Q374 3 365 0H356V62H425V194V275Q425 348 416 373T371 399Q326 399 288 370T238 290Q236 281 235 171V62H304V0H295Q277 3 171 3Q64 3 46 0H37V62H106V210V303Q106 353 104 363T91 376Q77 380 50 380H37V442H40Z\"><\/path><path id=\"MJX-776-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D402\" xlink:href=\"#MJX-776-TEX-B-1D402\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-776-TEX-B-1D428\" transform=\"translate(831,0)\"><\/use><use data-c=\"1D426\" xlink:href=\"#MJX-776-TEX-B-1D426\" transform=\"translate(1406,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-776-TEX-B-1D429\" transform=\"translate(2364,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbf{Comp}<\/script>, when one defines composition of chain maps coordinatewise: <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"23.673ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 10463.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-777-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 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-122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-777-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-777-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 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transform=\"translate(4426,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-777-TEX-N-7D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5203.8,0)\"><g data-mml-node=\"text\"><use data-c=\"3A\" xlink:href=\"#MJX-777-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"text\" transform=\"translate(278,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-777-TEX-N-3D\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6537.5,0)\"><use data-c=\"7B\" xlink:href=\"#MJX-777-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7037.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-777-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-777-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8244,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-777-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8966.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-777-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-777-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9963.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-777-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{g_n\\}\\circ\\{f_n\\}:=\\{g_n\\circ f_n\\}<\/script>.<\/p>\n<p>It&#39;s easy to prove this is a category.<\/p>\n<\/blockquote>\n<blockquote><p><strong>2.4 Theorem.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.303ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4554.1 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1074-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1074-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1074-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1074-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1074-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1074-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2513.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1074-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3791.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1074-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:X\\to Y<\/script> be a continuous function and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"17.252ex\" height=\"2.36ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7625.3 1043.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.663ex;\"><defs><path id=\"MJX-779-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-779-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-779-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-779-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-779-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 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488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-779-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-779-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-779-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1549.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-779-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-779-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2754.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-779-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-779-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3930.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-779-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4875.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-779-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-779-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5995.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-779-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6384.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-779-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7236.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-779-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum_im_i\\sigma_i\\in S_n(X)<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.001ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 3094.5 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-780-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-780-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-780-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-780-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-780-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-780-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1482.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-780-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(2427.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-780-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">m_i\\in \\mathbb Z<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.032ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 898 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1183-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1183-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1183-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1183-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i<\/script> is an <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"0.781ex\" height=\"1.52ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 345 672\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-839-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-839-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i<\/script>. Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"36.102ex\" height=\"2.36ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 15956.9 1043.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.663ex;\"><defs><path id=\"MJX-784-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 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443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-784-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-784-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-784-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-784-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-784-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-784-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-784-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-784-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-784-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-784-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-784-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-784-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-784-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1162,0)\"><use data-c=\"28\" xlink:href=\"#MJX-784-TEX-N-28\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1551,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-784-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(3100.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-784-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4305.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-784-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5203.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-784-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5870.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-784-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(6926.1,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-784-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,-285.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(8475.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-784-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(9680.7,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-784-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10452.9,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-784-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(11175.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-784-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-784-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12350.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-784-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(13295.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-784-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-784-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14415.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-784-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(14804.9,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-784-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(15567.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-784-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_\\#(\\sum_im_i\\sigma_i)=\\sum_i m_if\\circ\\sigma_i\\in S_n(Y)<\/script>, and then we get a sequence of homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.54ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9962.7 1037.2\" 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236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-785-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-785-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-785-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 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-247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-785-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-785-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-785-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1939.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-785-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2495.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-785-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-785-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3615.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-785-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4004.8,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-785-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4856.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-785-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5523.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-785-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6801.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-785-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-785-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7921.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-785-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8310.7,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-785-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9073.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-785-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9462.7,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-785-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{f_\\#:S_n(X)\\to S_n(Y)\\}<\/script>. (Note: <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.629ex\" height=\"2.245ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1162 992.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-786-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-786-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-786-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-786-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_\\#<\/script> does depend on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>, but we usually don&#39;t give it a subscript.)<\/p>\n<p>Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.654ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5151.1 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-788-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-788-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-788-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-788-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-788-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-788-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-788-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-788-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-788-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-788-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-788-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-788-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1988.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-788-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2655.3,0)\"><g data-mml-node=\"text\"><use data-c=\"3A\" xlink:href=\"#MJX-788-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"text\" transform=\"translate(278,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-788-TEX-N-3D\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(3989.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-788-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-788-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*(f):=f_\\#<\/script>. And then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"36.045ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 15931.7 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-789-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-789-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-789-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-789-TEX-B-1D413\" d=\"M41 425Q41 426 51 545T62 669V675H737V669Q738 665 748 546T758 425V419H696V425Q687 517 669 555T595 607Q578 612 522 613H478V62H631V0H615Q585 3 399 3Q214 3 184 0H168V62H321V613H277H263Q164 613 134 561Q113 527 103 425V419H41V425Z\"><\/path><path id=\"MJX-789-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-789-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><path id=\"MJX-789-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-789-TEX-B-1D400\" d=\"M296 0Q278 3 164 3Q58 3 49 0H40V62H92Q144 62 144 64Q388 682 397 689Q403 698 434 698Q463 698 471 689Q475 686 538 530T663 218L724 64Q724 62 776 62H828V0H817Q796 3 658 3Q509 3 485 0H472V62H517Q561 62 561 63L517 175H262L240 120Q218 65 217 64Q217 62 261 62H306V0H296ZM390 237L492 238L440 365Q390 491 388 491Q287 239 287 237H390Z\"><\/path><path id=\"MJX-789-TEX-B-1D41B\" d=\"M32 686L123 690Q214 694 215 694H221V409Q289 450 378 450Q479 450 539 387T600 221Q600 122 535 58T358 -6H355Q272 -6 203 53L160 1L129 0H98V301Q98 362 98 435T99 525Q99 591 97 604T83 620Q69 624 42 624H29V686H32ZM227 105L232 99Q237 93 242 87T258 73T280 59T306 49T339 45Q380 45 411 66T451 131Q457 160 457 230Q457 264 456 284T448 329T430 367T396 389T343 398Q282 398 235 355L227 348V105Z\"><\/path><path id=\"MJX-789-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-789-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-789-TEX-B-1D402\" d=\"M64 343Q64 502 174 599T468 697Q502 697 533 691T586 674T623 655T647 639T657 632L694 663Q703 670 711 677T723 687T730 692T735 695T740 696T746 697Q759 697 762 692T766 668V627V489V449Q766 428 762 424T742 419H732H720Q699 419 697 436Q690 498 657 545Q611 618 532 632Q522 634 496 634Q356 634 286 553Q232 488 232 343T286 133Q355 52 497 52Q597 52 650 112T704 237Q704 248 709 251T729 254H735Q750 254 755 253T763 248T766 234Q766 136 680 63T469 -11Q285 -11 175 86T64 343Z\"><\/path><path id=\"MJX-789-TEX-B-1D426\" d=\"M40 442Q217 450 218 450H224V365Q226 367 235 378T254 397T278 416T314 435T362 448Q376 450 400 450H406Q503 450 534 393Q545 376 545 370Q545 368 555 379Q611 450 716 450Q774 450 809 434Q850 414 861 379T873 276V213V198V62H942V0H933Q915 3 809 3Q702 3 684 0H675V62H744V194V275Q744 348 735 373T690 399Q645 399 607 370T557 290Q555 281 554 171V62H623V0H614Q596 3 489 3Q374 3 365 0H356V62H425V194V275Q425 348 416 373T371 399Q326 399 288 370T238 290Q236 281 235 171V62H304V0H295Q277 3 171 3Q64 3 46 0H37V62H106V210V303Q106 353 104 363T91 376Q77 380 50 380H37V442H40Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-789-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-789-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1398,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-789-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1953.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D413\" xlink:href=\"#MJX-789-TEX-B-1D413\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-789-TEX-B-1D428\" transform=\"translate(800,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-789-TEX-B-1D429\" transform=\"translate(1375,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4245.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-789-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(5523.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D400\" xlink:href=\"#MJX-789-TEX-B-1D400\"><\/use><use data-c=\"1D41B\" xlink:href=\"#MJX-789-TEX-B-1D41B\" transform=\"translate(869,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7031.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-789-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7476,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-789-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-789-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8803.4,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-789-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(9359.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D413\" xlink:href=\"#MJX-789-TEX-B-1D413\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-789-TEX-B-1D428\" transform=\"translate(800,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-789-TEX-B-1D429\" transform=\"translate(1375,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11650.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-789-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(12928.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D402\" xlink:href=\"#MJX-789-TEX-B-1D402\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-789-TEX-B-1D428\" transform=\"translate(831,0)\"><\/use><use data-c=\"1D426\" xlink:href=\"#MJX-789-TEX-B-1D426\" transform=\"translate(1406,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-789-TEX-B-1D429\" transform=\"translate(2364,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n:\\mathbf{Top}\\to \\mathbf{Ab},S_*:\\mathbf{Top}\\to \\mathbf{Comp}<\/script> are functors.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.303ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4554.1 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1074-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1074-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1074-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1074-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1074-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1074-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2513.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1074-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3791.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1074-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:X\\to Y<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.846ex\" height=\"2.009ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 4352.1 888\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path 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xlink:href=\"#MJX-791-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2351.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-791-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3629.1,0)\"><use data-c=\"1D44D\" xlink:href=\"#MJX-791-TEX-I-1D44D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g:Y\\to Z<\/script> are continuous functions. Then, for any <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, we have<\/p>\n<div 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transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-17-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-17-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2495.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-17-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2884.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-17-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3583.8,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-17-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4306,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-17-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4877,0)\"><use data-c=\"29\" xlink:href=\"#MJX-17-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-1318.6)\"><g data-mml-node=\"mtd\" transform=\"translate(4770.5,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(4770.5,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-17-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-17-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-17-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2717.8,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-17-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3440,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-17-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-17-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4589,0)\"><use data-c=\"28\" xlink:href=\"#MJX-17-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4978,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-17-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5549,0)\"><use data-c=\"29\" xlink:href=\"#MJX-17-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5938,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-17-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>By the universal property of free abelian groups, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.123ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8010.5 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-795-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-795-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-795-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-795-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-795-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-795-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-795-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-795-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-795-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1161.2,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-795-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.4,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-795-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2360.4,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-795-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-795-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3699.2,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-795-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4755,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-795-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-795-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6139.3,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-795-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6861.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-795-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-795-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(f\\circ g)_\\#=f_\\#\\circ g_\\#<\/script>.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.682ex\" height=\"1.846ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 1185.5 816\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-796-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-796-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-796-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(533,-150) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-796-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1_X<\/script> be the identity map of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>. Then, for any <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n144\" cid=\"n144\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.451ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9923.5 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-18-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-18-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-18-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-18-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-18-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-18-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-18-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-18-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-18-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-18-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(533,-150) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-18-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1574.5,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-18-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-18-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2635.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-18-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3024.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-18-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3595.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-18-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4262.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-18-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5318,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-18-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(533,-150) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-18-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6725.7,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-18-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7447.9,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-18-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8296.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-18-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9352.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-18-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Similarly, because of the universal property of free abelian groups, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.699ex\" height=\"2.497ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6496.8 1103.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.8ex;\"><defs><path id=\"MJX-801-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-801-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-801-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-801-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-801-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-801-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-801-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-801-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-801-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-801-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(533,-150) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-801-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1574.5,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-801-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-801-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2913.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-801-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3969,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-801-TEX-N-31\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(533,-176.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-801-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-801-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-801-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-801-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2361.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-801-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(1_X)_\\#=1_{S_n(X)}<\/script>\u200b. <\/p>\n<p>Consequently, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.535ex\" height=\"1.952ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1120.3 862.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-802-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-802-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-802-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-802-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n<\/script> is a functor.<\/p>\n<p>Next, to check <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.375ex\" height=\"1.878ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1049.6 830.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-851-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-851-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-851-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-851-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*<\/script> is a functor, we need to verity the commutation of diagram<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n148\" cid=\"n148\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"29.421ex\" height=\"14.95ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1454 13004.2 6608\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -11.661ex;\"><defs><path id=\"MJX-19-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-19-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 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transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-19-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2023.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-19-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2412.9,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-19-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-19-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>; for any <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 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width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>\u200b, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n150\" cid=\"n150\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"26.112ex\" 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data-mml-node=\"mtr\" transform=\"translate(0,-1300)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-21-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-21-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-21-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-21-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-21-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2878.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-21-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3267.8,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><g data-mml-node=\"text\"><use data-c=\"3A\" xlink:href=\"#MJX-21-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"text\" transform=\"translate(278,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-21-TEX-N-3D\"><\/use><\/g><\/g><g data-mml-node=\"mfrac\" transform=\"translate(1611.6,0)\"><g data-mml-node=\"mrow\" transform=\"translate(258,710)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-21-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-21-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-21-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1579.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-21-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-21-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2730.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-21-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mrow\" transform=\"translate(220,-710)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-21-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-21-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-21-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1655.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-21-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-21-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2806.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-21-TEX-N-29\"><\/use><\/g><\/g><rect width=\"3395.8\" height=\"60\" x=\"120\" y=\"220\"><\/rect><\/g><g data-mml-node=\"mo\" transform=\"translate(5247.4,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-21-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Similarly, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.058ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3119.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-808-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-808-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-808-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-808-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-808-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-808-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-808-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-808-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-808-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1579.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-808-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-808-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2730.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-808-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_n(C_*)<\/script> is called the group of <strong><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-cycles<\/strong>, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.23ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3195.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-810-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-810-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-810-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-810-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-810-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-810-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-810-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-810-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-810-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1655.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-810-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-810-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2806.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-810-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_n(C_*)<\/script> is called the group of <strong><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-boundaries<\/strong>, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.393ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3267.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-886-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-886-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-886-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-886-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-886-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-886-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-886-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-886-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-886-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-886-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-886-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2878.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-886-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(C_*)<\/script> is called <strong><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-th homology group<\/strong>.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.699ex\" height=\"2.283ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 9148.8 1009\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-814-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-814-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-814-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-814-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-814-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-814-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-814-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-814-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-814-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-814-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><path id=\"MJX-814-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-814-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-814-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1383.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-814-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1772.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-814-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-814-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2924.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-814-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3368.8,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-814-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3934.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-814-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4601.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-814-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5879.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-814-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6268.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-814-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-814-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-814-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7419.9,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-814-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(7864.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-814-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(650.8,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-814-TEX-V-2032\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8759.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-814-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:(C_*,\\partial)\\to (C_*'.\\partial')<\/script> be a chain map. Define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n157\" cid=\"n157\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"28.201ex\" height=\"5.337ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1429.5 12464.7 2359\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.103ex;\"><defs><path id=\"MJX-22-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-22-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-22-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-22-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-22-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-22-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-22-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-22-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 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transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-22-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1282.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-22-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-22-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(6767.6,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-22-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1555.6,0)\"><use data-c=\"63\" xlink:href=\"#MJX-22-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-22-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-22-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2671.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-22-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3060.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-22-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-22-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4057.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-22-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-22-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5030.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-22-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5419.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-22-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>We also denote <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.032ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2666.3 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-815-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 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xlink:href=\"#MJX-815-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-815-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-815-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(f)<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.096ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 926.6 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-816-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-816-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-816-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-816-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_*<\/script>. If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.138ex\" height=\"2.009ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 4481.1 888\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-817-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-817-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-817-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-817-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-817-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-817-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(754.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-817-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1310.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-817-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2440.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-817-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3718.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-817-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g:X\\to Y<\/script> is continuous. We denote <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.002ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4420.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-818-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-818-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-818-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-818-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-818-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-818-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-818-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-818-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-818-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-818-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-818-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-818-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2776.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-818-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3165.8,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-818-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3642.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-818-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4031.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-818-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(S_*(g))<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.067ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 913.6 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-819-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-819-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-819-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-819-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g_*<\/script>, too.<\/p>\n<\/blockquote>\n<blockquote><p><strong>2.6 Theorem.<\/strong><\/p>\n<p><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.639ex\" height=\"2.018ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -698 8238.4 892\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-820-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-820-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-820-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-820-TEX-B-1D402\" d=\"M64 343Q64 502 174 599T468 697Q502 697 533 691T586 674T623 655T647 639T657 632L694 663Q703 670 711 677T723 687T730 692T735 695T740 696T746 697Q759 697 762 692T766 668V627V489V449Q766 428 762 424T742 419H732H720Q699 419 697 436Q690 498 657 545Q611 618 532 632Q522 634 496 634Q356 634 286 553Q232 488 232 343T286 133Q355 52 497 52Q597 52 650 112T704 237Q704 248 709 251T729 254H735Q750 254 755 253T763 248T766 234Q766 136 680 63T469 -11Q285 -11 175 86T64 343Z\"><\/path><path id=\"MJX-820-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-820-TEX-B-1D426\" d=\"M40 442Q217 450 218 450H224V365Q226 367 235 378T254 397T278 416T314 435T362 448Q376 450 400 450H406Q503 450 534 393Q545 376 545 370Q545 368 555 379Q611 450 716 450Q774 450 809 434Q850 414 861 379T873 276V213V198V62H942V0H933Q915 3 809 3Q702 3 684 0H675V62H744V194V275Q744 348 735 373T690 399Q645 399 607 370T557 290Q555 281 554 171V62H623V0H614Q596 3 489 3Q374 3 365 0H356V62H425V194V275Q425 348 416 373T371 399Q326 399 288 370T238 290Q236 281 235 171V62H304V0H295Q277 3 171 3Q64 3 46 0H37V62H106V210V303Q106 353 104 363T91 376Q77 380 50 380H37V442H40Z\"><\/path><path id=\"MJX-820-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><path id=\"MJX-820-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-820-TEX-B-1D400\" d=\"M296 0Q278 3 164 3Q58 3 49 0H40V62H92Q144 62 144 64Q388 682 397 689Q403 698 434 698Q463 698 471 689Q475 686 538 530T663 218L724 64Q724 62 776 62H828V0H817Q796 3 658 3Q509 3 485 0H472V62H517Q561 62 561 63L517 175H262L240 120Q218 65 217 64Q217 62 261 62H306V0H296ZM390 237L492 238L440 365Q390 491 388 491Q287 239 287 237H390Z\"><\/path><path id=\"MJX-820-TEX-B-1D41B\" d=\"M32 686L123 690Q214 694 215 694H221V409Q289 450 378 450Q479 450 539 387T600 221Q600 122 535 58T358 -6H355Q272 -6 203 53L160 1L129 0H98V301Q98 362 98 435T99 525Q99 591 97 604T83 620Q69 624 42 624H29V686H32ZM227 105L232 99Q237 93 242 87T258 73T280 59T306 49T339 45Q380 45 411 66T451 131Q457 160 457 230Q457 264 456 284T448 329T430 367T396 389T343 398Q282 398 235 355L227 348V105Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-820-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-820-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1616,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-820-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(2171.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D402\" xlink:href=\"#MJX-820-TEX-B-1D402\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-820-TEX-B-1D428\" transform=\"translate(831,0)\"><\/use><use data-c=\"1D426\" xlink:href=\"#MJX-820-TEX-B-1D426\" transform=\"translate(1406,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-820-TEX-B-1D429\" transform=\"translate(2364,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5452.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-820-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(6730.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D400\" xlink:href=\"#MJX-820-TEX-B-1D400\"><\/use><use data-c=\"1D41B\" xlink:href=\"#MJX-820-TEX-B-1D41B\" transform=\"translate(869,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n:\\mathbf{Comp}\\to \\mathbf{Ab}<\/script> is a functor. <\/p>\n<p>And thus, the composition <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.913ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 9243.4 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-821-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-821-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-821-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-821-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-821-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-821-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-821-TEX-B-1D413\" d=\"M41 425Q41 426 51 545T62 669V675H737V669Q738 665 748 546T758 425V419H696V425Q687 517 669 555T595 607Q578 612 522 613H478V62H631V0H615Q585 3 399 3Q214 3 184 0H168V62H321V613H277H263Q164 613 134 561Q113 527 103 425V419H41V425Z\"><\/path><path id=\"MJX-821-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-821-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><path id=\"MJX-821-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-821-TEX-B-1D400\" d=\"M296 0Q278 3 164 3Q58 3 49 0H40V62H92Q144 62 144 64Q388 682 397 689Q403 698 434 698Q463 698 471 689Q475 686 538 530T663 218L724 64Q724 62 776 62H828V0H817Q796 3 658 3Q509 3 485 0H472V62H517Q561 62 561 63L517 175H262L240 120Q218 65 217 64Q217 62 261 62H306V0H296ZM390 237L492 238L440 365Q390 491 388 491Q287 239 287 237H390Z\"><\/path><path id=\"MJX-821-TEX-B-1D41B\" d=\"M32 686L123 690Q214 694 215 694H221V409Q289 450 378 450Q479 450 539 387T600 221Q600 122 535 58T358 -6H355Q272 -6 203 53L160 1L129 0H98V301Q98 362 98 435T99 525Q99 591 97 604T83 620Q69 624 42 624H29V686H32ZM227 105L232 99Q237 93 242 87T258 73T280 59T306 49T339 45Q380 45 411 66T451 131Q457 160 457 230Q457 264 456 284T448 329T430 367T396 389T343 398Q282 398 235 355L227 348V105Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-821-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-821-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1560.5,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-821-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2282.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-821-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-821-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3610,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-821-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(4165.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D413\" xlink:href=\"#MJX-821-TEX-B-1D413\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-821-TEX-B-1D428\" transform=\"translate(800,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-821-TEX-B-1D429\" transform=\"translate(1375,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6457.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-821-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(7735.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D400\" xlink:href=\"#MJX-821-TEX-B-1D400\"><\/use><use data-c=\"1D41B\" xlink:href=\"#MJX-821-TEX-B-1D41B\" transform=\"translate(869,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n\\circ S_*:\\mathbf{Top}\\to \\mathbf{Ab}<\/script> is also a functor. We always write <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.539ex\" height=\"1.952ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 3332.3 862.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-822-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-822-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-822-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-822-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-822-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-822-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-822-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1560.5,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-822-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2282.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-822-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-822-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n\\circ S_*<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.128ex\" height=\"2.22ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 4476.6 981.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.503ex;\"><defs><path id=\"MJX-824-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-824-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-824-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-824-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-824-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-824-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1151.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-824-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1596.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-824-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-824-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-824-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2747.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-824-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(3192.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-824-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><g data-c=\"2033\"><use data-c=\"2032\" xlink:href=\"#MJX-824-TEX-V-2032\"><\/use><use data-c=\"2032\" xlink:href=\"#MJX-824-TEX-V-2032\" transform=\"translate(275,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-824-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">C_*,C_*',C_*''<\/script> be chain complexes, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"31.546ex\" height=\"2.283ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 13943.2 1009\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-825-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-825-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-825-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 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d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-825-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-825-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-825-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-825-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><path id=\"MJX-825-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-825-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" 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xlink:href=\"#MJX-825-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(5537.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-825-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-825-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-825-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6689.5,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-825-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7134.1,0)\"><use data-c=\"7B\" xlink:href=\"#MJX-825-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7634.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-825-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-825-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8618.4,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-825-TEX-N-7D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9396.2,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-825-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(9952,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-825-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-825-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-825-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11381.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-825-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(12659.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-825-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><g data-c=\"2033\"><use data-c=\"2032\" xlink:href=\"#MJX-825-TEX-V-2032\"><\/use><use data-c=\"2032\" xlink:href=\"#MJX-825-TEX-V-2032\" transform=\"translate(275,0)\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-825-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{f_n\\}:C_*\\to C_*',\\{g_n\\}:C_*\u2019\\to C_*''<\/script> be chain maps.<\/p>\n<p>Then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n166\" cid=\"n166\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"37.134ex\" height=\"8.145ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -2050 16413.3 3600\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -3.507ex;\"><defs><path id=\"MJX-23-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-23-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 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338Z\"><\/path><path id=\"MJX-24-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-24-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-24-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-24-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-24-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-24-TEX-N-31\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(533,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-24-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-24-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3124.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-24-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3680.2,0)\"><use data-c=\"63\" xlink:href=\"#MJX-24-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-24-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-24-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4962.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-24-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-24-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6212.9,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-24-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7268.7,0)\"><use data-c=\"63\" xlink:href=\"#MJX-24-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-24-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-24-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8551.4,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-24-TEX-N-31\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(533,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-24-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-24-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(9998.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-24-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-24-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11248.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-24-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(12304.4,0)\"><use data-c=\"63\" xlink:href=\"#MJX-24-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-24-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-24-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(13587.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-24-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-24-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14559.4,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-24-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script> is a functor. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>2.7 Lemma.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.697ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 750 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-828-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D434\" xlink:href=\"#MJX-828-TEX-I-1D434\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">A<\/script> be a subspace of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> with inclusion <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.247ex\" height=\"2.081ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 4529.1 920\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-830-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-830-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-830-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-830-TEX-N-21AA\" d=\"M55 347Q55 380 72 404T113 441T159 458T197 464Q222 464 222 444Q222 429 204 426T157 417T110 387Q95 369 95 347Q95 339 98 330T111 307T142 283T196 270H961Q845 357 818 493Q818 494 818 496T817 499Q817 511 834 511H837Q846 511 849 510T855 506T858 497T861 481T869 456Q891 389 942 336T1061 261Q1070 258 1070 250Q1070 244 1065 241T1041 231T1003 212Q962 186 932 152T887 85T866 35T858 4Q856 -6 853 -8T837 -11Q817 -11 817 0Q817 7 822 25Q854 151 961 230H196Q149 230 102 260T55 347Z\"><\/path><path id=\"MJX-830-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-830-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(689.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-830-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1245.6,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-830-TEX-I-1D434\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2273.3,0)\"><use data-c=\"21AA\" xlink:href=\"#MJX-830-TEX-N-21AA\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3677.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-830-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j:A\\hookrightarrow X<\/script>. Then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.072ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8871.7 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-831-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-831-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-831-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-831-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-831-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-831-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-831-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-831-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-831-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-831-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-831-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-831-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1361.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-831-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1917.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-831-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-831-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3037.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-831-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3426.8,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-831-TEX-I-1D434\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4176.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-831-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4843.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-831-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6121.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-831-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-831-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7241.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-831-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7630.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-831-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8482.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-831-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j_\\#:S_n(A)\\to S_n(X)<\/script> is an injection for every <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-982-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-982-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-982-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-982-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-982-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-982-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 0<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.451ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9039.4 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-833-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-833-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-833-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-833-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-833-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-833-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-833-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-833-TEX-N-6B\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T97 124T98 167T98 217T98 272T98 329Q98 366 98 407T98 482T98 542T97 586T97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V463L180 233L240 287Q300 341 304 347Q310 356 310 364Q310 383 289 385H284V431H293Q308 428 412 428Q475 428 484 431H489V385H476Q407 380 360 341Q286 278 286 274Q286 273 349 181T420 79Q434 60 451 53T500 46H511V0H505Q496 3 418 3Q322 3 307 0H299V46H306Q330 48 330 65Q330 72 326 79Q323 84 276 153T228 222L176 176V120V84Q176 65 178 59T189 49Q210 46 238 46H254V0H246Q231 3 137 3T28 0H20V46H36Z\"><\/path><path id=\"MJX-833-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-833-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-833-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-833-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-833-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-833-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1876.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-833-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3099.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-833-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-833-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4304.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-833-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-833-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5479.9,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-833-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6424.7,0)\"><use data-c=\"6B\" xlink:href=\"#MJX-833-TEX-N-6B\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-833-TEX-N-65\" transform=\"translate(528,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-833-TEX-N-72\" transform=\"translate(972,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7955.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-833-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-833-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma = \\sum m_i\\sigma_i\\in \\operatorname{ker} j_\\#<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.032ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 898 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1183-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1183-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1183-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1183-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i<\/script> are distinct <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplices.<\/p>\n<p>Then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.823ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 10087.7 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-836-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-836-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-836-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-836-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-836-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-836-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-836-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-836-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-836-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-836-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-836-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-836-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-836-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1084,0)\"><use data-c=\"28\" xlink:href=\"#MJX-836-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1473,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-836-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2016,0)\"><use data-c=\"29\" xlink:href=\"#MJX-836-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2682.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-836-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3738.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-836-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4961.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-836-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-836-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6166.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-836-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6555.2,0)\"><use data-c=\"1D457\" xlink:href=\"#MJX-836-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6967.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-836-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-836-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7865.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-836-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8531.9,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-836-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(9587.7,0)\"><use data-c=\"30\" xlink:href=\"#MJX-836-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j_\\#(\\gamma)=\\sum m_i (j\\sigma_i)=0<\/script>. <\/p>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.432ex\" height=\"1.957ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 9030.9 865\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-837-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-837-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-837-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-837-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-837-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><path id=\"MJX-837-TEX-N-21D2\" d=\"M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-837-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(412,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-837-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-837-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1587.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-837-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2643.5,0)\"><use data-c=\"1D457\" xlink:href=\"#MJX-837-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3055.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-837-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(604,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-837-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(378,289) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-837-TEX-V-2032\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4427.4,0)\"><use data-c=\"21D2\" xlink:href=\"#MJX-837-TEX-N-21D2\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5705.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-837-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-837-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6880.9,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-837-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7936.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-837-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(604,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-837-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(378,289) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-837-TEX-V-2032\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j\\sigma_i=j\\sigma_{i'}\\Rightarrow \\sigma_i=\\sigma_{i'}<\/script>, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.964ex\" height=\"1.957ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 1310 865\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-838-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-838-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-838-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-838-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(412,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-838-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-838-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j\\sigma_i<\/script> are distinct. Therefore, for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"0.781ex\" height=\"1.52ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 345 672\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-839-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-839-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i<\/script>, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.874ex\" height=\"1.864ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 3038.5 823.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-840-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-840-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-840-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-840-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-840-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-840-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1482.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-840-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2538.5,0)\"><use data-c=\"30\" xlink:href=\"#MJX-840-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">m_i=0<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<p><strong>Recall: Coproduct<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.853ex\" height=\"1.706ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -728 819 754\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.059ex;\"><defs><path id=\"MJX-842-TEX-S-1D49E\" d=\"M367 89Q367 84 353 77T334 70Q325 70 312 83T298 120Q298 169 364 233T496 298Q538 298 563 275T588 220V213Q588 132 501 53T306 -26Q251 -26 211 6T170 114Q171 148 181 184T205 248T232 298T255 334T265 349T246 350Q127 350 77 390T26 480Q26 533 71 581T178 656T295 683Q312 683 312 676Q312 674 311 672L302 660Q294 648 292 647L286 646Q280 646 276 646Q197 641 145 583T93 476Q93 387 265 387Q271 387 277 387T287 388T292 388T313 414T373 483T451 562Q618 712 732 727Q733 727 740 727T753 728Q790 727 804 708T819 665Q819 643 810 617T773 553T699 481T572 414T385 361Q381 361 367 341Q247 172 247 86Q247 11 325 11Q404 11 465 95Q518 165 528 208Q529 212 529 220Q529 237 518 249T480 261Q431 261 387 209T343 126Q343 111 355 101T367 89ZM777 658Q777 691 738 691Q704 691 658 662T570 590T491 504T432 432T410 400H411Q416 400 440 405T505 423T589 455T675 506T743 576Q777 627 777 658Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D49E\" xlink:href=\"#MJX-842-TEX-S-1D49E\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathscr C<\/script> be a category, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.258ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9838 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-843-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-843-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-843-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-843-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-843-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-843-TEX-N-39B\" d=\"M320 708Q326 716 340 716H348H355Q367 716 372 708Q374 706 423 547T523 226T575 62Q581 52 591 50T634 46H661V0H653Q644 3 532 3Q411 3 390 0H379V46H392Q464 46 464 65Q463 70 390 305T316 539L246 316Q177 95 177 84Q177 72 198 59T248 46H253V0H245Q230 3 130 3Q47 3 38 0H32V46H45Q112 51 127 91Q128 92 224 399T320 708Z\"><\/path><path id=\"MJX-843-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><path id=\"MJX-843-TEX-N-2282\" d=\"M84 250Q84 372 166 450T360 539Q361 539 370 539T395 539T430 540T475 540T524 540H679Q694 532 694 520Q694 511 681 501L522 500H470H441Q366 500 338 496T266 472Q244 461 224 446T179 404T139 337T124 250V245Q124 157 185 89Q244 25 328 7Q348 2 366 2T522 0H681Q694 -10 694 -20Q694 -32 679 -40H526Q510 -40 480 -40T434 -41Q350 -41 289 -25T172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-843-TEX-N-4F\" d=\"M56 340Q56 423 86 494T164 610T270 680T388 705Q521 705 621 601T722 341Q722 260 693 191T617 75T510 4T388 -22T267 3T160 74T85 189T56 340ZM467 647Q426 665 388 665Q360 665 331 654T269 620T213 549T179 439Q174 411 174 354Q174 144 277 61Q327 20 385 20H389H391Q474 20 537 99Q603 188 603 354Q603 411 598 439Q577 592 467 647Z\"><\/path><path id=\"MJX-843-TEX-N-62\" d=\"M307 -11Q234 -11 168 55L158 37Q156 34 153 28T147 17T143 10L138 1L118 0H98V298Q98 599 97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V543Q179 391 180 391L183 394Q186 397 192 401T207 411T228 421T254 431T286 439T323 442Q401 442 461 379T522 216Q522 115 458 52T307 -11ZM182 98Q182 97 187 90T196 79T206 67T218 55T233 44T250 35T271 29T295 26Q330 26 363 46T412 113Q424 148 424 212Q424 287 412 323Q385 405 300 405Q270 405 239 390T188 347L182 339V98Z\"><\/path><path id=\"MJX-843-TEX-N-6A\" d=\"M98 609Q98 637 116 653T160 669Q183 667 200 652T217 609Q217 579 200 564T158 549Q133 549 116 564T98 609ZM28 -163Q58 -168 64 -168Q124 -168 135 -77Q137 -65 137 141T136 353Q132 371 120 377T72 385H52V408Q52 431 54 431L58 432Q62 432 70 432T87 433T108 434T133 436Q151 437 171 438T202 441T214 442H218V184Q217 -36 217 -59T211 -98Q195 -145 153 -175T58 -205Q9 -205 -23 -179T-55 -117Q-55 -94 -40 -79T-2 -64T36 -79T52 -118Q52 -143 28 -163Z\"><\/path><path id=\"MJX-843-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-843-TEX-S-1D49E\" d=\"M367 89Q367 84 353 77T334 70Q325 70 312 83T298 120Q298 169 364 233T496 298Q538 298 563 275T588 220V213Q588 132 501 53T306 -26Q251 -26 211 6T170 114Q171 148 181 184T205 248T232 298T255 334T265 349T246 350Q127 350 77 390T26 480Q26 533 71 581T178 656T295 683Q312 683 312 676Q312 674 311 672L302 660Q294 648 292 647L286 646Q280 646 276 646Q197 641 145 583T93 476Q93 387 265 387Q271 387 277 387T287 388T292 388T313 414T373 483T451 562Q618 712 732 727Q733 727 740 727T753 728Q790 727 804 708T819 665Q819 643 810 617T773 553T699 481T572 414T385 361Q381 361 367 341Q247 172 247 86Q247 11 325 11Q404 11 465 95Q518 165 528 208Q529 212 529 220Q529 237 518 249T480 261Q431 261 387 209T343 126Q343 111 355 101T367 89ZM777 658Q777 691 738 691Q704 691 658 662T570 590T491 504T432 432T410 400H411Q416 400 440 405T505 423T589 455T675 506T743 576Q777 627 777 658Z\"><\/path><path id=\"MJX-843-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-843-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-843-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-843-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1823.2,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-843-TEX-N-3B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2267.9,0)\"><use data-c=\"1D706\" xlink:href=\"#MJX-843-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3128.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-843-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4073.5,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-843-TEX-N-39B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4767.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-843-TEX-N-7D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5545.2,0)\"><use data-c=\"2282\" xlink:href=\"#MJX-843-TEX-N-2282\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6601,0)\"><use data-c=\"4F\" xlink:href=\"#MJX-843-TEX-N-4F\"><\/use><use data-c=\"62\" xlink:href=\"#MJX-843-TEX-N-62\" transform=\"translate(778,0)\"><\/use><use data-c=\"6A\" xlink:href=\"#MJX-843-TEX-N-6A\" transform=\"translate(1334,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8241,0)\"><use data-c=\"28\" xlink:href=\"#MJX-843-TEX-N-28\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(8630,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D49E\" xlink:href=\"#MJX-843-TEX-S-1D49E\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9449,0)\"><use data-c=\"29\" xlink:href=\"#MJX-843-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{X_\\lambda;\\lambda\\in \\Lambda\\}\\subset \\operatorname{Obj}(\\mathscr C)<\/script> is a set of some objects.<\/p>\n<p>Then the <strong>coproduct<\/strong> is an object <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.627ex\" height=\"2.362ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2929.2 1043.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.665ex;\"><defs><path id=\"MJX-844-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 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683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-844-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-844-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1605.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-844-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-844-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\coprod_\\lambda X_\\lambda<\/script> with inclusions <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.927ex\" height=\"2.362ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7481.8 1043.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.665ex;\"><defs><path id=\"MJX-845-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-845-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-845-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-845-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-845-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-845-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-845-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(378,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-845-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1118,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-845-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1673.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-845-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-845-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3274.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-845-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(4552.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-845-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-845-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6158.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-845-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-845-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i_\\lambda:X_\\lambda\\to \\coprod_\\lambda X_\\lambda<\/script> such that for all morphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.431ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6378.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-846-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 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250Z\"><\/path><path id=\"MJX-846-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-846-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-846-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-846-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-846-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1763,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-846-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2318.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-846-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-846-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3919.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-846-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5197.6,0)\"><use data-c=\"1D43F\" xlink:href=\"#MJX-846-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5878.6,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-846-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{f_\\lambda:X_\\lambda\\to L\\}<\/script>, there is a unique morphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.448ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 640 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-847-TEX-I-1D6FC\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FC\" xlink:href=\"#MJX-847-TEX-I-1D6FC\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\alpha<\/script> make all diagrams like<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n180\" cid=\"n180\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.192ex\" height=\"21.794ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1075 8040.7 9633.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -19.362ex;\"><defs><path id=\"MJX-25-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 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data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-25-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(616,-312.4)\"><use data-c=\"30\" xlink:href=\"#MJX-25-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"3.9159665581351204\" data-y=\"4.325033008588991\" data-xypic-id=\"5\" transform=\"translate(5131.9,-4075)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-25-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(944,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-25-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-25-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"5.441009541088308\" data-y=\"6.295038148957249\" data-xypic-id=\"6\" transform=\"translate(6657,-6045)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"2203\" xlink:href=\"#MJX-25-TEX-N-2203\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(556,0)\"><use data-c=\"21\" xlink:href=\"#MJX-25-TEX-N-21\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(834,0)\"><use data-c=\"1D6FC\" xlink:href=\"#MJX-25-TEX-I-1D6FC\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"4.709088184850999\" data-y=\"8.358033008588992\" data-xypic-id=\"8\" transform=\"translate(5925.1,-8108)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-25-TEX-I-1D43F\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commute.<\/p>\n<p>Coproduct is a specific example of colimits (direct limits). Next, I will show you that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script>\u200b preserve coproduct. Actually, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script> is co-continuous; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script> preserve colimits. <\/p>\n<blockquote><p><strong>2.8 Lemma.<\/strong><\/p>\n<p>Functor <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.375ex\" height=\"1.878ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1049.6 830.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-851-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-851-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-851-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-851-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*<\/script> preserve coproduct; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.917ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5267.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-908-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-908-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-908-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-908-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-908-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-908-TEX-N-39B\" d=\"M320 708Q326 716 340 716H348H355Q367 716 372 708Q374 706 423 547T523 226T575 62Q581 52 591 50T634 46H661V0H653Q644 3 532 3Q411 3 390 0H379V46H392Q464 46 464 65Q463 70 390 305T316 539L246 316Q177 95 177 84Q177 72 198 59T248 46H253V0H245Q230 3 130 3Q47 3 38 0H32V46H45Q112 51 127 91Q128 92 224 399T320 708Z\"><\/path><path id=\"MJX-908-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-908-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-908-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-908-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1823.2,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-908-TEX-N-3B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2267.9,0)\"><use data-c=\"1D706\" xlink:href=\"#MJX-908-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3128.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-908-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4073.5,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-908-TEX-N-39B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4767.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-908-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{X_\\lambda;\\lambda\\in \\Lambda\\}<\/script> is a set of topological spaces and let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.451ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4619.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-853-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-853-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-853-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-853-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-853-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1129.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-853-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2185.6,0)\"><use data-c=\"2210\" xlink:href=\"#MJX-853-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3296.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-853-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-853-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X=\\coprod X_\\lambda<\/script>, and then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.721ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8274.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-854-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-854-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-854-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-854-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-854-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-854-TEX-N-2245\" d=\"M55 388Q55 463 101 526T222 589Q260 589 296 571T362 526T421 474T484 430T554 411Q616 411 655 458T694 560Q694 572 698 580T708 589Q722 589 722 556Q722 482 677 419T562 356H554Q517 356 481 374T414 418T355 471T292 515T223 533Q179 533 145 508Q109 479 96 440T80 378T69 355Q55 355 55 388ZM56 236Q56 249 70 256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><path id=\"MJX-854-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-854-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-854-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-854-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-854-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-854-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-854-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2957.3,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-854-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4013.1,0)\"><use data-c=\"2210\" xlink:href=\"#MJX-854-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5123.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-854-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-854-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6173.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-854-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6562.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-854-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-854-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7885.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-854-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*(X)\\cong \\coprod S_*(X_\\lambda)<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.379ex\" height=\"2.007ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 5471.6 887\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-855-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-855-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-855-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-855-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-855-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-855-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-855-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1185,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-855-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1740.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-855-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-855-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3341.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-855-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4619.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-855-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j_\\lambda:X_\\lambda\\to X<\/script> be inclusions.<\/p>\n<p>It&#39;s sufficient to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.062ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2679.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-856-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-856-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-856-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-856-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-856-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-856-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-856-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-856-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-856-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-856-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*(X)<\/script> has the same universal property as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.641ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4261.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-857-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-857-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-857-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-857-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-857-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-857-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-857-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-857-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-857-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-857-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1438.6,0)\"><use data-c=\"2210\" xlink:href=\"#MJX-857-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2549.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-857-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-857-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3872.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-857-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_*(\\coprod X_\\lambda)<\/script>; that is, for all complexes <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.528ex\" height=\"1.829ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1117.6 808.3\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.283ex;\"><defs><path id=\"MJX-858-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-858-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-858-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(714,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-858-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">L_*<\/script> and chain maps <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"17.291ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7642.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-859-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-859-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-859-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-859-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-859-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-859-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-859-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 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481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-859-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-859-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-859-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1263,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-859-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1818.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-859-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-859-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2868.4,0)\"><use data-c=\"28\" xlink:href=\"#MJX-859-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3257.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-859-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-859-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4580.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-859-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5247.4,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-859-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6525.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-859-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(714,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-859-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_\\lambda:S_*(X_\\lambda)\\to L_*<\/script>, there is a unique chain map <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script> such that the diagrams<\/p>\n<div 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data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-26-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-26-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-26-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-26-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-26-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"6.406596373546461\" data-y=\"6.278132404180068\" data-xypic-id=\"6\" transform=\"translate(8382,-6028.1)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"2203\" xlink:href=\"#MJX-26-TEX-N-2203\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(556,0)\"><use data-c=\"21\" xlink:href=\"#MJX-26-TEX-N-21\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(834,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-26-TEX-I-1D711\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"5.4563983220125145\" data-y=\"8.383000000000001\" data-xypic-id=\"8\" transform=\"translate(7431.8,-8133)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-26-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(714,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-26-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commute.<\/p>\n<ul>\n<li><p>Existence of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script>:<\/p>\n<p>For each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>, since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.032ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 1340.3 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1036-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1036-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1036-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1036-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n<\/script> is path connected, there is a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.655ex\" height=\"1.71ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 2499.6 756\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-865-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-865-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 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xlink:href=\"#MJX-865-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1805.6,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-865-TEX-N-39B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\lambda\\in \\Lambda<\/script> such that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.006ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6190.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-866-TEX-N-69\" d=\"M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 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55T200 49Q221 46 249 46H265V0H257L234 1Q210 2 183 2T145 3Q42 3 33 0H25V46H41Z\"><\/path><path id=\"MJX-866-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-866-TEX-N-2282\" d=\"M84 250Q84 372 166 450T360 539Q361 539 370 539T395 539T430 540T475 540T524 540H679Q694 532 694 520Q694 511 681 501L522 500H470H441Q366 500 338 496T266 472Q244 461 224 446T179 404T139 337T124 250V245Q124 157 185 89Q244 25 328 7Q348 2 366 2T522 0H681Q694 -10 694 -20Q694 -32 679 -40H526Q510 -40 480 -40T434 -41Q350 -41 289 -25T172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-866-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-866-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-866-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-866-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-866-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"69\" xlink:href=\"#MJX-866-TEX-N-69\"><\/use><use data-c=\"6D\" xlink:href=\"#MJX-866-TEX-N-6D\" transform=\"translate(278,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1277.7,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-866-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2126.4,0)\"><use data-c=\"2282\" xlink:href=\"#MJX-866-TEX-N-2282\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3182.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-866-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-866-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4089.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-866-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4478.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-866-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-866-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5801.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-866-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\operatorname{im}\\sigma\\subset j_\\lambda(X_\\lambda)<\/script>.<\/p>\n<p>Therefore, for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.758ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9174.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-867-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-867-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-867-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-867-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-867-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-867-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-867-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-867-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-867-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-867-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-867-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-867-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-867-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-867-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1876.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-867-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3099.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-867-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-867-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4304.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-867-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-867-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5479.9,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-867-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6424.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-867-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-867-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7544.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-867-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7933.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-867-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8785.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-867-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma=\\sum m_i \\sigma_i\\in S_n(X)<\/script> with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.032ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 898 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1183-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1183-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1183-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1183-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i<\/script> are <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplices, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.086ex\" height=\"3.024ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -882.5 9762 1336.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.028ex;\"><defs><path id=\"MJX-870-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-870-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-870-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-870-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-870-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-870-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-870-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 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xlink:href=\"#MJX-870-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-870-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4631.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-870-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-870-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-870-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-870-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6358.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-870-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,411.6) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-870-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-870-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-317.1) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-870-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-870-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-870-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8086,0)\"><use data-c=\"28\" xlink:href=\"#MJX-870-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8475,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-870-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-870-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9373,0)\"><use data-c=\"29\" xlink:href=\"#MJX-870-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma=\\sum_i m_ij_{\\lambda_i\\#}j_{\\lambda_i\\#}^{-1}(\\sigma_i)<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.901ex\" height=\"2.289ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5702.4 1011.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.592ex;\"><defs><path id=\"MJX-871-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 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transform=\"translate(3369.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-871-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3758.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-871-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(861,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-871-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-871-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5313.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-871-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i\\subset j_{\\lambda_i}(X_{\\lambda_i})<\/script>.<\/p>\n<p>Define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block 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data-c=\"28\" xlink:href=\"#MJX-27-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8093.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-27-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-27-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8991.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-27-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9380.7,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-27-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>It&#39;s easy to know <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.627ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1161.3 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-872-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-872-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-872-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(687,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-872-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi_n<\/script> are group homomorphisms. We should show that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.386ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4148.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-873-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-873-TEX-N-3D\" d=\"M56 347Q56 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731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-873-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(931.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-873-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1987.6,0)\"><use data-c=\"7B\" xlink:href=\"#MJX-873-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2487.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-873-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(687,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-873-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3648.8,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-873-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi=\\{\\varphi_n\\}<\/script>\u200b is a chain map.<\/p>\n<p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.229ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 985.2 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-874-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 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<mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.385ex\" height=\"2.145ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -661 1496.3 948.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-875-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-875-TEX-I-1D706\" d=\"M166 673Q166 685 183 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326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-875-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-875-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(583,0)\"><use data-c=\"23\" xlink:href=\"#MJX-875-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j_{\\lambda\\#}<\/script> are chain maps, we have commutative diagrams<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n200\" cid=\"n200\" 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xlink:href=\"#MJX-30-TEX-N-28\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(4353.5,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-30-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-30-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5964.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-30-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-30-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(7169.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-30-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-30-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8067.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-30-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8456.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-30-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/li>\n<li><p>Uniqueness of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script>:<\/p>\n<p>If there are <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> both satisfy the properties, then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n208\" cid=\"n208\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"47.874ex\" height=\"15.897ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3763.3 21160.5 7026.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -7.383ex;\"><defs><path id=\"MJX-31-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-31-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-31-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-31-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-31-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-31-TEX-LO-2211\" d=\"M60 948Q63 950 665 950H1267L1325 815Q1384 677 1388 669H1348L1341 683Q1320 724 1285 761Q1235 809 1174 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429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-31-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-31-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 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data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5305.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-31-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6510.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-31-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7408,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(7797,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-31-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1722.6,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-31-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2598.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3599,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-31-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4250,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4639,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(5028,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-31-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6638.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-31-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(7843.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-31-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-31-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-31-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(9571.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-31-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-31-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-315.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-31-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-31-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11298.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(11687.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-31-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12585.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12974.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,371.1)\"><g data-mml-node=\"mtd\" transform=\"translate(7797,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(7797,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-31-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-31-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-31-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4149.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4538.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4927.2,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-31-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5803.4,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6803.6,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-31-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7454.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7843.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-31-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-31-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-31-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9571.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(9960.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-31-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-31-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-315.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-31-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-31-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11687.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(12076.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-31-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12974.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2071.1)\"><g data-mml-node=\"mtd\" transform=\"translate(7797,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(7797,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-31-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-31-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(600,-1084.4) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-31-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4149.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4538.2,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-31-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5310.4,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6310.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-31-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6860.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(7249.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-31-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-31-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-31-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,-315.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-31-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(910,0)\"><use data-c=\"23\" xlink:href=\"#MJX-31-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8977.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-31-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9366.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-31-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-31-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10264,0)\"><use data-c=\"29\" xlink:href=\"#MJX-31-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10930.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-31-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(11986.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-31-TEX-N-30\"><\/use><use data-c=\"2E\" xlink:href=\"#MJX-31-TEX-N-2E\" transform=\"translate(500,0)\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.97ex\" height=\"2.063ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 2638.6 912\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-906-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-906-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-906-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-906-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(931.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-906-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1987.6,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-906-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi = \\psi<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/li>\n\n<\/ul>\n<\/blockquote>\n<blockquote><p><strong>2.9 Theorem.<\/strong><\/p>\n<p>Functor <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.028ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1338.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-881-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-881-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-881-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-881-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n<\/script> preserve coproduct; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.8ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2563.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-882-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-882-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-882-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-882-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-882-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-882-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-882-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-882-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-882-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2063.8,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-882-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{C_{\\lambda*}\\}<\/script> is a set of chain complexes, and then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"26.936ex\" height=\"2.362ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 11905.5 1043.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.665ex;\"><defs><path id=\"MJX-883-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-883-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-883-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-883-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-883-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-883-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-883-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-883-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-883-TEX-N-2245\" d=\"M55 388Q55 463 101 526T222 589Q260 589 296 571T362 526T421 474T484 430T554 411Q616 411 655 458T694 560Q694 572 698 580T708 589Q722 589 722 556Q722 482 677 419T562 356H554Q517 356 481 374T414 418T355 471T292 515T223 533Q179 533 145 508Q109 479 96 440T80 378T69 355Q55 355 55 388ZM56 236Q56 249 70 256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-883-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-883-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-883-TEX-N-28\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-883-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-883-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(3333.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-883-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-883-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-883-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4897,0)\"><use data-c=\"29\" xlink:href=\"#MJX-883-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5563.7,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-883-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(6619.5,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-883-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-883-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(8225.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-883-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-883-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9563.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-883-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9952.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-883-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-883-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-883-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11516.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-883-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(\\coprod_\\lambda C_{\\lambda*})\\cong\\coprod_\\lambda H_n(C_{\\lambda*})<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.794ex\" height=\"2.362ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5654.8 1043.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.665ex;\"><defs><path id=\"MJX-884-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-884-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-884-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-884-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-884-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-884-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-884-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1429.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-884-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(2485.1,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-884-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-884-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4091,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-884-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-884-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-884-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">C_*=\\coprod_\\lambda C_{\\lambda*}<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.601ex\" height=\"2.057ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 6011.7 909\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.462ex;\"><defs><path id=\"MJX-885-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 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663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-885-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-885-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-885-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-885-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1185,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-885-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1740.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-885-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-885-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-885-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3582.4,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-885-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4860.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-885-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-885-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">j_\\lambda:C_{\\lambda*}\\to C_*<\/script> be inclusions.<\/p>\n<p>It&#39;s sufficient to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.393ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3267.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-886-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-886-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-886-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-886-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-886-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-886-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-886-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-886-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-886-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-886-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-886-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2878.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-886-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(C_*)<\/script> has the same universal property as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.959ex\" height=\"2.362ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5286 1043.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.665ex;\"><defs><path id=\"MJX-887-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-887-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-887-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-887-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-887-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-887-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-887-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-887-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"munder\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-887-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(977,-285.4) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-887-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1605.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-887-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-887-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2944.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-887-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3333.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-887-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-887-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-887-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4897,0)\"><use data-c=\"29\" xlink:href=\"#MJX-887-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\coprod_\\lambda H_n(C_{\\lambda*})<\/script>; that is, for all abelian groups <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.541ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 681 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-888-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-888-TEX-I-1D43F\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">L<\/script> and homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"17.501ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7735.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-889-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-889-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-889-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 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637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-889-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-889-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1263,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-889-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1818.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-889-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-889-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3157.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-889-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3546.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-889-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-889-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-889-TEX-N-2217\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5109.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-889-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5776.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-889-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7054.4,0)\"><use data-c=\"1D43F\" xlink:href=\"#MJX-889-TEX-I-1D43F\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_\\lambda :H_n(C_{\\lambda*})\\to L<\/script>, there is a unique homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.819ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6991.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-890-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-890-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-890-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 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26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-890-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-890-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 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0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-890-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(931.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-890-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1487.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-890-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-890-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2825.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-890-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3214.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-890-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-890-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4366.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-890-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5033.2,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-890-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6310.9,0)\"><use data-c=\"1D43F\" xlink:href=\"#MJX-890-TEX-I-1D43F\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi:H_n(C_*)\\to L<\/script>, such that the diagrams<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n216\" cid=\"n216\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container 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data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-32-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2878.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-32-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"6.96536044225839\" data-y=\"6.24681958851545\" data-xypic-id=\"6\" transform=\"translate(9205.4,-5996.8)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"2203\" xlink:href=\"#MJX-32-TEX-N-2203\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(556,0)\"><use data-c=\"21\" xlink:href=\"#MJX-32-TEX-N-21\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(834,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-32-TEX-I-1D711\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"6.2334390860210815\" data-y=\"8.383\" data-xypic-id=\"8\" transform=\"translate(8473.5,-8133)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-32-TEX-I-1D43F\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commute.<\/p>\n<ul>\n<li>Existence of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 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157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1008-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1008-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 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fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"63\" xlink:href=\"#MJX-1008-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1008-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-1008-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1282.7,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-1008-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2025.4,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1008-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2970.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1008-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1008-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4308.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1008-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4697.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-1008-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1008-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5849,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1008-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\operatorname{cls} z\\in H_n(C_*)<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.876ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4807.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-893-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-893-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-893-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-893-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-893-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-893-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-893-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-893-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-893-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(742.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-893-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1687.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-893-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-893-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2877.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-893-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3266.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-893-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-893-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4418.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-893-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z\\in Z_n(C_*)<\/script>, can be write as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.008ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 3981.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-894-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-894-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-894-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-894-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-894-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(742.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-894-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1798.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-894-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3021.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-894-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-894-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z=\\sum z_\\lambda<\/script> with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.894ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5699.1 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-895-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-895-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-895-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-895-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-895-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-895-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 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xlink:href=\"#MJX-33-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(7221.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-33-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-33-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8182.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-33-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8571.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-33-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p> Next, let&#39;s show that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script> is well-defined.<\/p>\n<p> Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.967ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4847.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-897-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-897-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-897-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-897-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-897-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-897-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-897-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-897-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-897-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(706.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-897-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1651.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-897-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-897-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2917.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-897-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3306.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-897-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-897-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4458.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-897-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">b\\in B_n(C_*)<\/script>, and then there is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.804ex\" height=\"2.084ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 3891.5 921\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-898-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-898-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-898-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-898-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-898-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-898-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-898-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-898-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1765.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-898-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-898-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-898-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-898-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma\\in C_{n+1}<\/script> with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.497ex\" height=\"2.106ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 2871.6 931\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-899-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-899-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-899-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-899-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-899-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-899-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1386.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-899-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2442.6,0)\"><use data-c=\"1D44F\" xlink:href=\"#MJX-899-TEX-I-1D44F\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial \\gamma=b<\/script>\u200b.<\/p>\n<p> Because of the commutative diagram<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n227\" cid=\"n227\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"26.64ex\" height=\"14.918ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1454 11774.8 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transform=\"translate(861,0)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-34-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"8.749410134610626\" data-y=\"2.2044462838120875\" data-xypic-id=\"5\" transform=\"translate(10791.9,-1954.4)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-34-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-34-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"-1.062973267534168\" data-y=\"4.3342533905932745\" data-xypic-id=\"6\" transform=\"translate(979.5,-4084.3)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-34-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-34-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-34-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-34-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"3.9788831701108656\" data-y=\"4.982747473407614\" data-xypic-id=\"7\" transform=\"translate(6021.3,-4732.7)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-34-TEX-I-1D715\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"7.746856744017353\" data-y=\"4.359355681325397\" data-xypic-id=\"9\" transform=\"translate(9789.3,-4109.4)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-34-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-34-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p> , we have <\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n229\" cid=\"n229\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container 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data-mml-node=\"msub\" transform=\"translate(2517.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-35-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(462,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-35-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"1D44F\" xlink:href=\"#MJX-35-TEX-I-1D44F\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,1700)\"><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-35-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-35-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1899.6,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-35-TEX-I-1D6FE\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,200)\"><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-35-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-35-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2066.2,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-35-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3676.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-35-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4584.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-35-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-1500)\"><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-35-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-35-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2944.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-35-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3510.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-35-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4417.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-35-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-3200)\"><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(3442.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-35-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-35-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-35-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3851.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-35-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4240.5,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-35-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4806.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-35-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-35-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5819.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-35-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6208.7,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-35-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p> Thus, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"19.157ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8467.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-900-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-900-TEX-I-1D457\" d=\"M297 596Q297 627 318 644T361 661Q378 661 389 651T403 623Q403 595 384 576T340 557Q322 557 310 567T297 596ZM288 376Q288 405 262 405Q240 405 220 393T185 362T161 325T144 293L137 279Q135 278 121 278H107Q101 284 101 286T105 299Q126 348 164 391T252 441Q253 441 260 441T272 442Q296 441 316 432Q341 418 354 401T367 348V332L318 133Q267 -67 264 -75Q246 -125 194 -164T75 -204Q25 -204 7 -183T-12 -137Q-12 -110 7 -91T53 -71Q70 -71 82 -81T95 -112Q95 -148 63 -167Q69 -168 77 -168Q111 -168 139 -140T182 -74L193 -32Q204 11 219 72T251 197T278 308T289 365Q289 372 288 376Z\"><\/path><path id=\"MJX-900-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-900-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-900-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-900-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-900-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-900-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-900-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-900-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-900-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-900-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-900-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-900-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2129.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-900-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2518.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-900-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(462,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-900-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3665.4,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-900-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4665.6,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-900-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5231.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-900-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-900-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6244.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-900-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6911.6,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-900-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(7967.4,0)\"><use data-c=\"30\" xlink:href=\"#MJX-900-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum j_\\lambda(b_\\lambda-\\partial\\gamma_\\lambda)=0<\/script>\u200b.<\/p>\n<p> Consequently, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.681ex\" height=\"2.106ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 3837 931\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-901-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-901-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-901-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-901-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-901-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-901-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(462,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-901-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1202,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-901-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2257.8,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-901-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2823.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-901-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(551,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-901-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">b_\\lambda=\\partial\\gamma_\\lambda<\/script>; hence <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"26.026ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 11503.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-902-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-902-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-902-TEX-N-63\" d=\"M370 305T349 305T313 320T297 358Q297 381 312 396Q317 401 317 402T307 404Q281 408 258 408Q209 408 178 376Q131 329 131 219Q131 137 162 90Q203 29 272 29Q313 29 338 55T374 117Q376 125 379 127T395 129H409Q415 123 415 120Q415 116 411 104T395 71T366 33T318 2T249 -11Q163 -11 99 53T34 214Q34 318 99 383T250 448T370 421T404 357Q404 334 387 320Z\"><\/path><path id=\"MJX-902-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-902-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><path id=\"MJX-902-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-902-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 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xlink:href=\"#MJX-902-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2754.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-902-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3421.4,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-902-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4477.2,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-902-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5699.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-902-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-902-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6685.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-902-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7074.1,0)\"><use data-c=\"63\" xlink:href=\"#MJX-902-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-902-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-902-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8356.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-902-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(462,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-902-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9281,0)\"><use data-c=\"29\" xlink:href=\"#MJX-902-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9947.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-902-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(11003.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-902-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi(\\operatorname{cls} b)=\\sum f_\\lambda(\\operatorname{cls}b_\\lambda)=0<\/script>.<\/p>\n<ul>\n<li>Uniqueness of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script>:<\/li>\n\n<\/ul>\n<p> If there are <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> both satisfy the properties, then we have<\/p>\n<div contenteditable=\"false\" 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data-mml-node=\"mo\" transform=\"translate(1265.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-36-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2265.4,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-36-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2916.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-36-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3472.1,0)\"><use data-c=\"63\" xlink:href=\"#MJX-36-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-36-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-36-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4754.8,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-36-TEX-I-1D467\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(5219.8,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-36-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-36-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(515.9,-1107.7) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2777.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-36-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3166.6,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-36-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4042.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-36-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5043,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-36-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5694,0)\"><use data-c=\"29\" xlink:href=\"#MJX-36-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6083,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-36-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(445,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-36-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(7098.2,0)\"><use data-c=\"63\" xlink:href=\"#MJX-36-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-36-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-36-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(8380.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-36-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-36-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-36-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-315.7) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(9779.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-36-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-850)\"><g data-mml-node=\"mtd\" transform=\"translate(5219.8,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(5219.8,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-36-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-36-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(515.9,-1107.7) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2777.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-36-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3166.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-36-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3938.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-36-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4939,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-36-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5489,0)\"><use data-c=\"29\" xlink:href=\"#MJX-36-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6044.7,0)\"><use data-c=\"63\" xlink:href=\"#MJX-36-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-36-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-36-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(7327.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D457\" xlink:href=\"#MJX-36-TEX-I-1D457\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(445,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-36-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-36-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(445,-315.7) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(8726,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-36-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(498,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-36-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9964,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-36-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(11019.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-36-TEX-N-30\"><\/use><use data-c=\"2E\" xlink:href=\"#MJX-36-TEX-N-2E\" transform=\"translate(500,0)\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p> Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.97ex\" height=\"2.063ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 2638.6 912\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-906-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-906-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-906-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-906-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(931.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-906-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1987.6,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-906-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi = \\psi<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>2.10 Corollary.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.917ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5267.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-908-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-908-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-908-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-908-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-908-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-908-TEX-N-39B\" d=\"M320 708Q326 716 340 716H348H355Q367 716 372 708Q374 706 423 547T523 226T575 62Q581 52 591 50T634 46H661V0H653Q644 3 532 3Q411 3 390 0H379V46H392Q464 46 464 65Q463 70 390 305T316 539L246 316Q177 95 177 84Q177 72 198 59T248 46H253V0H245Q230 3 130 3Q47 3 38 0H32V46H45Q112 51 127 91Q128 92 224 399T320 708Z\"><\/path><path id=\"MJX-908-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-908-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-908-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-908-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1823.2,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-908-TEX-N-3B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2267.9,0)\"><use data-c=\"1D706\" xlink:href=\"#MJX-908-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3128.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-908-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4073.5,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-908-TEX-N-39B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4767.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-908-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{X_\\lambda;\\lambda\\in \\Lambda\\}<\/script> is the set of path components of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>, then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n241\" cid=\"n241\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21.412ex\" height=\"4.901ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -950 9464 2166.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.752ex;\"><defs><path id=\"MJX-37-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-37-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-37-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-37-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-37-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-37-TEX-N-2245\" d=\"M55 388Q55 463 101 526T222 589Q260 589 296 571T362 526T421 474T484 430T554 411Q616 411 655 458T694 560Q694 572 698 580T708 589Q722 589 722 556Q722 482 677 419T562 356H554Q517 356 481 374T414 418T355 471T292 515T223 533Q179 533 145 508Q109 479 96 440T80 378T69 355Q55 355 55 388ZM56 236Q56 249 70 256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><path id=\"MJX-37-TEX-LO-2210\" d=\"M220 812Q220 813 218 819T214 829T208 840T199 853T185 866T166 878T140 887T107 893T66 896H56V950H552V896H542Q411 896 389 812L388 208V-396H889V812Q889 813 887 819T883 829T877 840T868 853T854 866T835 878T809 887T776 893T735 896H725V950H1221V896H1211Q1080 896 1058 812V-311Q1076 -396 1211 -396H1221V-450H56V-396H66Q195 -396 219 -314Q220 -312 220 -311V812Z\"><\/path><path id=\"MJX-37-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-37-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-37-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-37-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-37-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-37-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-37-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-37-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(4301.8,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-37-TEX-LO-2210\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(432.9,-1107.7) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-37-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5746.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-37-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-37-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7084.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-37-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7473.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-37-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(861,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-37-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8797,0)\"><use data-c=\"29\" xlink:href=\"#MJX-37-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9186,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-37-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<h2 id='3-dimension-axiom-and-homotopy-axiom'>3. Dimension Axiom and Homotopy Axiom<\/h2>\n<p>In this section, we will introduce two axioms of homoblogy theory.<\/p>\n<blockquote><p><strong>3.1 Theorem (Dimension Axiom).<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is a one-point space, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script> for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-984-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-984-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-984-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-984-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-984-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 1<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>For each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-982-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-982-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-982-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-982-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-982-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-982-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 0<\/script>, there is only one singular <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.805ex\" height=\"1.977ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 5659.6 873.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-915-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-915-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-915-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-915-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-915-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-915-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-915-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-915-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1356,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-915-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1911.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-915-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-915-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3529.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-915-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4807.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-915-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_n:\\Delta^n\\to X<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.44ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 1078.3 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-916-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-916-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-916-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-916-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_n<\/script> is a constant map.<\/p>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.439ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5940.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-917-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-917-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-917-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-917-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-917-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-917-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-917-TEX-N-27E8\" d=\"M333 -232Q332 -239 327 -244T313 -250Q303 -250 296 -240Q293 -233 202 6T110 250T201 494T296 740Q299 745 306 749L309 750Q312 750 313 750Q331 750 333 732Q333 727 243 489Q152 252 152 250T243 11Q333 -227 333 -232Z\"><\/path><path id=\"MJX-917-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-917-TEX-N-27E9\" d=\"M55 732Q56 739 61 744T75 750Q85 750 92 740Q95 733 186 494T278 250T187 6T92 -240Q85 -250 75 -250Q67 -250 62 -245T55 -232Q55 -227 145 11Q236 248 236 250T145 489Q55 727 55 732Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-917-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-917-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-917-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-917-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2361.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-917-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3028,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-917-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mrow\" transform=\"translate(4083.8,0)\"><g data-mml-node=\"mo\"><use data-c=\"27E8\" xlink:href=\"#MJX-917-TEX-N-27E8\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(389,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-917-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-917-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1467.3,0)\"><use data-c=\"27E9\" xlink:href=\"#MJX-917-TEX-N-27E9\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_n(X)=\\left<\\sigma_n\\right><\/script>. Then, let&#39;s compute the boundary operators:<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n250\" cid=\"n250\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"37.486ex\" height=\"6.354ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1562.5 16568.7 2808.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.819ex;\"><defs><path id=\"MJX-38-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-38-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-38-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 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178 557 222T452 366T322 544L56 909L55 924Q55 945 60 948Z\"><\/path><path id=\"MJX-38-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-38-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-38-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-38-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-38-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-38-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-38-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-38-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-38-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1038.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-38-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2394.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-38-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munderover\" transform=\"translate(3450.1,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-38-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(148.2,-1087.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-38-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-38-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"30\" xlink:href=\"#MJX-38-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(509.9,1150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4894.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-38-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5283.1,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-38-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(6061.1,0)\"><use data-c=\"31\" xlink:href=\"#MJX-38-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(6561.1,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-38-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,413) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-38-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(7277,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-38-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(8355.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-38-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-38-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9426,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-38-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munderover\" transform=\"translate(10481.8,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-38-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(148.2,-1087.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-38-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-38-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"30\" xlink:href=\"#MJX-38-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(509.9,1150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11925.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-38-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12314.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-38-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(13092.8,0)\"><use data-c=\"31\" xlink:href=\"#MJX-38-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(13592.8,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-38-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,413) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-38-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(14308.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-38-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(604,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-38-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-38-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-38-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(16290.7,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-38-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>It follows that, for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-984-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 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1<\/script>,<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n252\" cid=\"n252\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"25.977ex\" height=\"5.428ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1449.5 11482 2399\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.148ex;\"><defs><path id=\"MJX-39-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-39-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-39-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 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id=\"MJX-39-TEX-N-69\" d=\"M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z\"><\/path><path id=\"MJX-39-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><path id=\"MJX-39-TEX-N-20\" d=\"\"><\/path><path id=\"MJX-39-TEX-N-6F\" d=\"M28 214Q28 309 93 378T250 448Q340 448 405 380T471 215Q471 120 407 55T250 -10Q153 -10 91 57T28 214ZM250 30Q372 30 372 193V225V250Q372 272 371 288T364 326T348 362T317 390T268 410Q263 411 252 411Q222 411 195 399Q152 377 139 338T126 246V226Q126 130 145 91Q177 30 250 30Z\"><\/path><path id=\"MJX-39-TEX-N-64\" d=\"M376 495Q376 511 376 535T377 568Q377 613 367 624T316 637H298V660Q298 683 300 683L310 684Q320 685 339 686T376 688Q393 689 413 690T443 693T454 694H457V390Q457 84 458 81Q461 61 472 55T517 46H535V0Q533 0 459 -5T380 -11H373V44L365 37Q307 -11 235 -11Q158 -11 96 50T34 215Q34 315 97 378T244 442Q319 442 376 393V495ZM373 342Q328 405 260 405Q211 405 173 369Q146 341 139 305T131 211Q131 155 138 120T173 59Q203 26 251 26Q322 26 373 103V342Z\"><\/path><path id=\"MJX-39-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-39-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-39-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-39-TEX-N-76\" d=\"M338 431Q344 429 422 429Q479 429 503 431H508V385H497Q439 381 423 345Q421 341 356 172T288 -2Q283 -11 263 -11Q244 -11 239 -2Q99 359 98 364Q93 378 82 381T43 385H19V431H25L33 430Q41 430 53 430T79 430T104 429T122 428Q217 428 232 431H240V385H226Q187 384 184 370Q184 366 235 234L286 102L377 341V349Q377 363 367 372T349 383T335 385H331V431H338Z\"><\/path><path id=\"MJX-39-TEX-N-6E\" d=\"M41 46H55Q94 46 102 60V68Q102 77 102 91T102 122T103 161T103 203Q103 234 103 269T102 328V351Q99 370 88 376T43 385H25V408Q25 431 27 431L37 432Q47 433 65 434T102 436Q119 437 138 438T167 441T178 442H181V402Q181 364 182 364T187 369T199 384T218 402T247 421T285 437Q305 442 336 442Q450 438 463 329Q464 322 464 190V104Q464 66 466 59T477 49Q498 46 526 46H542V0H534L510 1Q487 2 460 2T422 3Q319 3 310 0H302V46H318Q379 46 379 62Q380 64 380 200Q379 335 378 343Q372 371 358 385T334 402T308 404Q263 404 229 370Q202 343 195 315T187 232V168V108Q187 78 188 68T191 55T200 49Q221 46 249 46H265V0H257L234 1Q210 2 183 2T145 3Q42 3 33 0H25V46H41Z\"><\/path><path id=\"MJX-39-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-39-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-39-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1038.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-39-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-39-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2394.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-39-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mrow\" transform=\"translate(3450.1,0)\"><g data-mml-node=\"mo\" transform=\"translate(0 -0.5)\"><use data-c=\"7B\" xlink:href=\"#MJX-39-TEX-S3-7B\"><\/use><\/g><g data-mml-node=\"mtable\" transform=\"translate(750,0)\"><g data-mml-node=\"mtr\" transform=\"translate(0,600)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-39-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-39-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3259.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-39-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(600,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-39-TEX-N-A0\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-39-TEX-N-69\" transform=\"translate(250,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-39-TEX-N-73\" transform=\"translate(528,0)\"><\/use><use data-c=\"20\" xlink:href=\"#MJX-39-TEX-N-20\" transform=\"translate(922,0)\"><\/use><use data-c=\"6F\" xlink:href=\"#MJX-39-TEX-N-6F\" transform=\"translate(1172,0)\"><\/use><use data-c=\"64\" xlink:href=\"#MJX-39-TEX-N-64\" transform=\"translate(1672,0)\"><\/use><use data-c=\"64\" xlink:href=\"#MJX-39-TEX-N-64\" transform=\"translate(2228,0)\"><\/use><use data-c=\"2C\" xlink:href=\"#MJX-39-TEX-N-2C\" transform=\"translate(2784,0)\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-600)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-39-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(604,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-39-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-39-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-39-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1981.9,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-39-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3259.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-39-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(600,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-39-TEX-N-A0\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-39-TEX-N-69\" transform=\"translate(250,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-39-TEX-N-73\" transform=\"translate(528,0)\"><\/use><use data-c=\"20\" xlink:href=\"#MJX-39-TEX-N-20\" transform=\"translate(922,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-39-TEX-N-65\" transform=\"translate(1172,0)\"><\/use><use data-c=\"76\" xlink:href=\"#MJX-39-TEX-N-76\" transform=\"translate(1616,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-39-TEX-N-65\" transform=\"translate(2144,0)\"><\/use><use data-c=\"6E\" xlink:href=\"#MJX-39-TEX-N-6E\" transform=\"translate(2588,0)\"><\/use><use data-c=\"2E\" xlink:href=\"#MJX-39-TEX-N-2E\" transform=\"translate(3144,0)\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8031.9,0) translate(0 250)\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Thus, for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-984-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-984-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-984-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-984-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-984-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 1<\/script>,we have two conditions:<\/p>\n<ul>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script> is odd, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.113ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7122.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-921-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-921-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-921-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-921-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-921-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-921-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-921-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-921-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-921-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-921-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1579.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-921-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2431.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-921-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3098,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-921-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4153.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-921-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-921-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5492.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-921-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5881.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-921-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6733.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-921-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_n(X)=H_n(X)<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.758ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5197.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-922-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-922-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-922-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-922-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-922-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-922-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-922-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-922-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-922-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1356,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-922-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2300.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-922-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-922-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3567.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-922-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3956.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-922-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4808.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-922-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_n \\in B_n(X)<\/script>. Hence, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.95ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7050.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-923-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-923-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-923-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-923-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-923-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-923-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-923-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-923-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-923-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-923-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1579.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-923-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2431.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-923-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3098,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-923-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4153.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-923-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-923-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5420.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-923-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5809.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-923-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6661.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-923-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_n(X)=B_n(X)<\/script>.<\/li>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script> is even, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.529ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4653.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-925-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-925-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-925-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-925-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-925-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-925-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-925-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-925-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-925-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1190.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-925-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1579.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-925-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2431.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-925-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3098,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-925-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4153.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-925-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_n(X)=0<\/script>.<\/li>\n\n<\/ul>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>3.2 Definition.<\/strong><\/p>\n<p>A space <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is called <strong>acyclic<\/strong> if <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script> for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-984-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-984-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-984-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-984-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-984-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 1<\/script>.<\/p>\n<\/blockquote>\n<blockquote><p><strong>3.3 Proposition.<\/strong><\/p>\n<ul>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.076ex\" height=\"1.932ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -772 2685.6 854\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.186ex;\"><defs><path id=\"MJX-931-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-931-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-931-TEX-N-2205\" d=\"M331 696Q335 708 339 722T345 744T350 759T357 769T367 772Q374 772 381 767T388 754Q388 746 377 712L366 673L378 661Q460 575 460 344Q460 281 456 234T432 126T373 27Q319 -22 250 -22Q214 -22 180 -7Q168 -3 168 -4L159 -33Q148 -71 142 -75Q138 -78 132 -78Q124 -78 118 -72T111 -60Q111 -52 122 -18L133 21L125 29Q39 111 39 344Q39 596 137 675Q187 716 251 716Q265 716 278 714T296 710T315 703T331 696ZM276 676Q264 679 246 679Q196 679 159 631Q134 597 128 536T121 356Q121 234 127 174T151 80L234 366Q253 430 275 506T308 618L318 654Q318 656 294 669L276 676ZM181 42Q207 16 250 16Q291 16 324 47Q354 78 366 136T378 356Q378 470 372 528T349 616L348 613Q348 611 264 326L181 42Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-931-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1129.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-931-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2185.6,0)\"><use data-c=\"2205\" xlink:href=\"#MJX-931-TEX-N-2205\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X=\\emptyset<\/script>, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script> for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-982-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-982-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-982-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-982-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-982-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-982-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 0<\/script>.<\/li>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is a one-point space, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.082ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4898.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-935-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-935-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-935-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-935-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-935-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-935-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-935-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-935-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-935-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-935-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-935-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-935-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-935-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(4231.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-935-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_0(X)= \\mathbb Z<\/script>\u200b\u200b.<\/li>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is the Cantor set, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"28.573ex\" height=\"5.428ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1449.5 12629.4 2399\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.148ex;\"><defs><path id=\"MJX-937-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-937-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-937-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-937-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-937-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-937-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-937-TEX-S3-7B\" d=\"M618 -943L612 -949H582L568 -943Q472 -903 411 -841T332 -703Q327 -682 327 -653T325 -350Q324 -28 323 -18Q317 24 301 61T264 124T221 171T179 205T147 225T132 234Q130 238 130 250Q130 255 130 258T131 264T132 267T134 269T139 272T144 275Q207 308 256 367Q310 436 323 519Q324 529 325 851Q326 1124 326 1154T332 1205Q369 1358 566 1443L582 1450H612L618 1444V1429Q618 1413 616 1411L608 1406Q599 1402 585 1393T552 1372T515 1343T479 1305T449 1257T429 1200Q425 1180 425 1152T423 851Q422 579 422 549T416 498Q407 459 388 424T346 364T297 318T250 284T214 264T197 254L188 251L205 242Q290 200 345 138T416 3Q421 -18 421 -48T423 -349Q423 -397 423 -472Q424 -677 428 -694Q429 -697 429 -699Q434 -722 443 -743T465 -782T491 -816T519 -845T548 -868T574 -886T595 -899T610 -908L616 -910Q618 -912 618 -928V-943Z\"><\/path><path id=\"MJX-937-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><path id=\"MJX-937-TEX-N-2295\" d=\"M56 250Q56 394 156 488T384 583Q530 583 626 485T722 250Q722 110 625 14T390 -83Q249 -83 153 14T56 250ZM364 542Q308 539 251 509T148 418T96 278V270H369V542H364ZM681 278Q675 338 650 386T592 462T522 509T458 535T412 542H409V270H681V278ZM96 222Q104 150 139 95T219 12T302 -29T366 -42H369V230H96V222ZM681 222V230H409V-42H412Q429 -42 456 -36T521 -10T590 37T649 113T681 222Z\"><\/path><path id=\"MJX-937-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-937-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-937-TEX-N-6F\" d=\"M28 214Q28 309 93 378T250 448Q340 448 405 380T471 215Q471 120 407 55T250 -10Q153 -10 91 57T28 214ZM250 30Q372 30 372 193V225V250Q372 272 371 288T364 326T348 362T317 390T268 410Q263 411 252 411Q222 411 195 399Q152 377 139 338T126 246V226Q126 130 145 91Q177 30 250 30Z\"><\/path><path id=\"MJX-937-TEX-N-74\" d=\"M27 422Q80 426 109 478T141 600V615H181V431H316V385H181V241Q182 116 182 100T189 68Q203 29 238 29Q282 29 292 100Q293 108 293 146V181H333V146V134Q333 57 291 17Q264 -10 221 -10Q187 -10 162 2T124 33T105 68T98 100Q97 107 97 248V385H18V422H27Z\"><\/path><path id=\"MJX-937-TEX-N-68\" d=\"M41 46H55Q94 46 102 60V68Q102 77 102 91T102 124T102 167T103 217T103 272T103 329Q103 366 103 407T103 482T102 542T102 586T102 603Q99 622 88 628T43 637H25V660Q25 683 27 683L37 684Q47 685 66 686T103 688Q120 689 140 690T170 693T181 694H184V367Q244 442 328 442Q451 442 463 329Q464 322 464 190V104Q464 66 466 59T477 49Q498 46 526 46H542V0H534L510 1Q487 2 460 2T422 3Q319 3 310 0H302V46H318Q379 46 379 62Q380 64 380 200Q379 335 378 343Q372 371 358 385T334 402T308 404Q263 404 229 370Q202 343 195 315T187 232V168V108Q187 78 188 68T191 55T200 49Q221 46 249 46H265V0H257L234 1Q210 2 183 2T145 3Q42 3 33 0H25V46H41Z\"><\/path><path id=\"MJX-937-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-937-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-937-TEX-N-77\" d=\"M90 368Q84 378 76 380T40 385H18V431H24L43 430Q62 430 84 429T116 428Q206 428 221 431H229V385H215Q177 383 177 368Q177 367 221 239L265 113L339 328L333 345Q323 374 316 379Q308 384 278 385H258V431H264Q270 428 348 428Q439 428 454 431H461V385H452Q404 385 404 369Q404 366 418 324T449 234T481 143L496 100L537 219Q579 341 579 347Q579 363 564 373T530 385H522V431H529Q541 428 624 428Q692 428 698 431H703V385H697Q696 385 691 385T682 384Q635 377 619 334L559 161Q546 124 528 71Q508 12 503 1T487 -11H479Q460 -11 456 -4Q455 -3 407 133L361 267Q359 263 266 -4Q261 -11 243 -11H238Q225 -11 220 -3L90 368Z\"><\/path><path id=\"MJX-937-TEX-N-69\" d=\"M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z\"><\/path><path id=\"MJX-937-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><path id=\"MJX-937-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-937-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-937-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-937-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-937-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-937-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-937-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mrow\" transform=\"translate(4301.8,0)\"><g data-mml-node=\"mo\" transform=\"translate(0 -0.5)\"><use data-c=\"7B\" xlink:href=\"#MJX-937-TEX-S3-7B\"><\/use><\/g><g data-mml-node=\"mtable\" transform=\"translate(750,0)\"><g data-mml-node=\"mtr\" transform=\"translate(0,552)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msup\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-937-TEX-D-2124\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(700,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2295\" xlink:href=\"#MJX-937-TEX-N-2295\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(778,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-937-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1902.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-937-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3180.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-937-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-937-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-937-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2433.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-937-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-648)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-937-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-937-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3180.6,0)\"><g data-mml-node=\"mtext\"><use data-c=\"6F\" xlink:href=\"#MJX-937-TEX-N-6F\"><\/use><use data-c=\"74\" xlink:href=\"#MJX-937-TEX-N-74\" transform=\"translate(500,0)\"><\/use><use data-c=\"68\" xlink:href=\"#MJX-937-TEX-N-68\" transform=\"translate(889,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-937-TEX-N-65\" transform=\"translate(1445,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-937-TEX-N-72\" transform=\"translate(1889,0)\"><\/use><use data-c=\"77\" xlink:href=\"#MJX-937-TEX-N-77\" transform=\"translate(2281,0)\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-937-TEX-N-69\" transform=\"translate(3003,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-937-TEX-N-73\" transform=\"translate(3281,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-937-TEX-N-65\" transform=\"translate(3675,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4119,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-937-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8327.6,0) translate(0 250)\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=\\begin{cases}\\mathbb Z^{\\oplus X},&n=0,\\\\0,&\\text{otherwise}.\\end{cases}<\/script> <\/li>\n\n<\/ul>\n<\/blockquote>\n<blockquote><p><strong>3.4 Theorem.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is a non-empty path-connected space, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.082ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4898.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1086-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1086-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1086-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1086-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1086-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1086-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1086-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1086-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1086-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1086-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1086-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1086-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1086-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(4231.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-1086-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_0(X)=\\mathbb Z<\/script>.<\/p>\n<p>Hence, for any topological space <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.726ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 763 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1081-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1081-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Y<\/script>, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"29.314ex\" height=\"2.676ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 12956.6 1182.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.71ex;\"><defs><path id=\"MJX-941-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-941-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-941-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-941-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 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749Z\"><\/path><path id=\"MJX-941-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-941-TEX-SO-2210\" d=\"M158 656Q147 684 131 694Q110 707 69 710H55V750H373V710H359Q325 708 305 698T280 678T271 656L270 223V-210H673V656Q666 672 663 679T639 697T584 710H570V750H888V710H874Q840 708 820 698T795 678T786 656V-155Q798 -206 874 -210H888V-250H55V-210H69Q103 -208 123 -197T148 -178T158 -155V656Z\"><\/path><path id=\"MJX-941-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-941-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-941-TEX-N-39B\" d=\"M320 708Q326 716 340 716H348H355Q367 716 372 708Q374 706 423 547T523 226T575 62Q581 52 591 50T634 46H661V0H653Q644 3 532 3Q411 3 390 0H379V46H392Q464 46 464 65Q463 70 390 305T316 539L246 316Q177 95 177 84Q177 72 198 59T248 46H253V0H245Q230 3 130 3Q47 3 38 0H32V46H45Q112 51 127 91Q128 92 224 399T320 708Z\"><\/path><path id=\"MJX-941-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><path id=\"MJX-941-TEX-N-2295\" d=\"M56 250Q56 394 156 488T384 583Q530 583 626 485T722 250Q722 110 625 14T390 -83Q249 -83 153 14T56 250ZM364 542Q308 539 251 509T148 418T96 278V270H369V542H364ZM681 278Q675 338 650 386T592 462T522 509T458 535T412 542H409V270H681V278ZM96 222Q104 150 139 95T219 12T302 -29T366 -42H369V230H96V222ZM681 222V230H409V-42H412Q429 -42 456 -36T521 -10T590 37T649 113T681 222Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-941-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-941-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-941-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-941-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2419.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-941-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3086.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-941-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munder\" transform=\"translate(4142.1,0)\"><g data-mml-node=\"mo\"><use data-c=\"2210\" xlink:href=\"#MJX-941-TEX-SO-2210\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(977,-285.4) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-941-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(583,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-941-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1250,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-941-TEX-N-39B\"><\/use><\/g><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6710.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-941-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-941-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7977.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-941-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8366.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44C\" xlink:href=\"#MJX-941-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(614,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-941-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9443.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-941-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10110,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-941-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(11165.7,0)\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-941-TEX-D-2124\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(700,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2295\" xlink:href=\"#MJX-941-TEX-N-2295\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(778,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-941-TEX-N-39B\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_0(Y)=\\coprod_{\\lambda\\in\\Lambda} H_0(Y_\\lambda)=\\mathbb Z^{\\oplus\\Lambda}<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.359ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5020.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-942-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-942-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><path id=\"MJX-942-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-942-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-942-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-942-TEX-N-39B\" d=\"M320 708Q326 716 340 716H348H355Q367 716 372 708Q374 706 423 547T523 226T575 62Q581 52 591 50T634 46H661V0H653Q644 3 532 3Q411 3 390 0H379V46H392Q464 46 464 65Q463 70 390 305T316 539L246 316Q177 95 177 84Q177 72 198 59T248 46H253V0H245Q230 3 130 3Q47 3 38 0H32V46H45Q112 51 127 91Q128 92 224 399T320 708Z\"><\/path><path id=\"MJX-942-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-942-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44C\" xlink:href=\"#MJX-942-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(614,-150) scale(0.707)\"><use data-c=\"1D706\" xlink:href=\"#MJX-942-TEX-I-1D706\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1576.2,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-942-TEX-N-3B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2020.9,0)\"><use data-c=\"1D706\" xlink:href=\"#MJX-942-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2881.7,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-942-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3826.5,0)\"><use data-c=\"39B\" xlink:href=\"#MJX-942-TEX-N-39B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4520.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-942-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{Y_\\lambda;\\lambda\\in \\Lambda\\}<\/script> are path components of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.726ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 763 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1081-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1081-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Y<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.337ex\" height=\"1.992ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 2801.1 880.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-944-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-944-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-944-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-944-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(564,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-944-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1245.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-944-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2301.1,0)\"><use data-c=\"30\" xlink:href=\"#MJX-944-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial_0=0<\/script>, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.3ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6762.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-945-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-945-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-945-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-945-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-945-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-945-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-945-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-945-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-945-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1119.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-945-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1508.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-945-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2360.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-945-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3027.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-945-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4083.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-945-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-945-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5132.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-945-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5521.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-945-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6373.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-945-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Z_0(X)=S_0(X)<\/script>.<\/p>\n<p>(We will use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.988ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2646.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-1145-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1145-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1145-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1145-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(849.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1145-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1794.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1145-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x\\in X<\/script> to denote the map <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.181ex\" height=\"2.326ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 7151.9 1027.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-947-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-947-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-947-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-947-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 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xlink:href=\"#MJX-947-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1547.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-947-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2825.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-947-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3677.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-947-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4121.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-947-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-947-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5302.1,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-947-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6579.9,0)\"><use data-c=\"1D465\" xlink:href=\"#MJX-947-TEX-I-1D465\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^0\\to X,e_0\\mapsto x<\/script>.)<\/p>\n<p>Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"27.954ex\" height=\"2.858ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -919.7 12355.6 1263\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.777ex;\"><defs><path id=\"MJX-948-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 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61V578Z\"><\/path><path id=\"MJX-948-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-948-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-948-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-948-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-948-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-948-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1036.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-948-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2092.6,0)\"><use data-c=\"7B\" xlink:href=\"#MJX-948-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"munderover\" transform=\"translate(2592.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-948-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1089,477.1) scale(0.707)\"><use data-c=\"1D461\" xlink:href=\"#MJX-948-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(1089,-285.4) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-948-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-948-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"31\" xlink:href=\"#MJX-948-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5045.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-948-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-948-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6250.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-948-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-948-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7149.8,0)\"><use data-c=\"3B\" xlink:href=\"#MJX-948-TEX-N-3B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7594.4,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-948-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8817.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-948-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-948-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10299.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-948-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(11355.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-948-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11855.6,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-948-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B=\\{\\sum_{i=1}^t m_i x_i;\\sum m_i=0\\}<\/script>. It&#39;s obvious that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.717ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 759 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-949-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-949-TEX-I-1D435\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B<\/script> is a subgroup of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.062ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2679.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-950-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-950-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-950-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-950-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-950-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-950-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-950-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1049.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-950-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1438.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-950-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2290.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-950-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">S_0(X)<\/script>.<\/p>\n<p>Next, let&#39;s prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.127ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4918.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-951-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-951-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-951-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-951-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-951-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-951-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-951-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1036.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-951-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2092.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-951-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-951-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3288.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-951-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3677.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-951-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4529.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-951-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B=B_0(X)<\/script>.<\/p>\n<ul>\n<li><p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.685ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7374.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-952-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-952-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-952-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-952-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-952-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-952-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-952-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-952-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-952-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-952-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-952-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-952-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-952-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2427.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-952-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-952-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3604.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-952-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4549.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-952-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-952-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5744.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-952-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6133.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-952-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6985.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-952-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_i x_i\\in B_0(X)<\/script>, then there is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"19.808ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8755.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-953-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-953-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-953-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-953-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 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311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-953-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-953-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-953-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-953-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-953-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-953-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1876.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-953-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3099.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-953-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-953-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(3955.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-953-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-953-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5130.9,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-953-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6075.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-953-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-953-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7125.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-953-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7514.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-953-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8366.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-953-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma=\\sum a_i\\sigma_i\\in S_1(X)<\/script> with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.052ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5769.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-954-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-954-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-954-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-954-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-954-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-954-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-954-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-954-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-954-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1386.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-954-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2442.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-954-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3665.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-954-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-954-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4870.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-954-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-954-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\gamma=\\sum m_i x_i<\/script>.<\/p>\n<p>And then, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"35.005ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 15472 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-955-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-955-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-955-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-955-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-955-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-955-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-955-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-955-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-955-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-955-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-955-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-955-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-955-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-955-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-955-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-955-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-955-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1386.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-955-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2442.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-955-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3498.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-955-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3887.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-955-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4743.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-955-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5641.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-955-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-955-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6766.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-955-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7766.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-955-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(8622.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-955-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(9520.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-955-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-955-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10422.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-955-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11089.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-955-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12145.5,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-955-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(13368.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-955-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(14573.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-955-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-955-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\gamma=\\sum (a_i\\sigma_i\\varepsilon_0-a_i\\sigma_i\\varepsilon_1)=\\sum m_i x_i<\/script>.<\/p>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.193ex\" height=\"1.462ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -452 5389.3 646\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-956-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-956-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-956-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-956-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-956-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-956-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-956-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-956-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-956-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(899,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-956-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1343.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-956-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-956-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2241.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-956-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-956-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3144.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-956-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3588.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-956-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-956-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4486.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-956-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-956-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_i,\\sigma_i\\varepsilon_0,\\sigma_i\\varepsilon_1<\/script> are generators, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"23.446ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 10363.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-957-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-957-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-957-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-957-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-957-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-957-TEX-I-1D44E\" d=\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-957-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-957-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-957-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-957-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-957-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-957-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2705.4,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-957-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3761.2,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-957-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4817.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-957-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5206.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-957-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-957-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6284.3,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-957-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7284.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-957-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(562,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-957-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8140.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-957-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8807.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-957-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(9863.1,0)\"><use data-c=\"30\" xlink:href=\"#MJX-957-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_i=\\sum (a_i-a_i)=0<\/script>.<\/p>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.009ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5308.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-959-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-959-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-959-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-959-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-959-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-959-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-959-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-959-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-959-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2427.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-959-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-959-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3604.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-959-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4549.1,0)\"><use data-c=\"1D435\" xlink:href=\"#MJX-959-TEX-I-1D435\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_i x_i\\in B<\/script>.<\/p>\n<\/li>\n<li><p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.009ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5308.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-959-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-959-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-959-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-959-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-959-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-959-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-959-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-959-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-959-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2427.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-959-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-959-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3604.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-959-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4549.1,0)\"><use data-c=\"1D435\" xlink:href=\"#MJX-959-TEX-I-1D435\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_i x_i\\in B<\/script>, and fix a point <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.975ex\" height=\"1.92ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 3083.1 848.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1089-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1089-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1089-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1089-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1089-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1089-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1286.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1089-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2231.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1089-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0\\in X<\/script>.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.849ex\" height=\"2.244ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 5679.1 991.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-961-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-961-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-961-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-961-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-961-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-961-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-961-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-961-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(714,-150) scale(0.707)\"><use data-c=\"1D465\" xlink:href=\"#MJX-961-TEX-I-1D465\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1446.2,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-961-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(2002,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-961-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-961-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3549.4,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-961-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4827.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-961-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">L_x:\\Delta^1\\to X<\/script> be a path from <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.282ex\" height=\"1.375ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1008.6 607.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1201-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1201-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1201-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1201-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0<\/script> to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.294ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 572 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1148-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1148-TEX-I-1D465\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x<\/script> (consider <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.872ex\" height=\"1.887ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 1269.6 833.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-964-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-964-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-964-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-964-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^1<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.14ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 504 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-965-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D43C\" xlink:href=\"#MJX-965-TEX-I-1D43C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">I<\/script>).<\/p>\n<p>Then let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21.733ex\" height=\"2.289ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9605.9 1011.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.592ex;\"><defs><path id=\"MJX-966-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-966-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-966-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 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16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-966-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-966-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-966-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-966-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-966-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-966-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-966-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-966-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-966-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-966-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-966-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1876.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-966-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3099.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-966-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-966-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4304.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-966-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-966-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-966-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5981.6,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-966-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6926.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-966-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-966-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7975.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-966-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8364.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-966-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9216.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-966-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma=\\sum m_iL_{x_i}\\in S_1(X)<\/script>. We can find that<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n291\" cid=\"n291\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"28.868ex\" height=\"14.706ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3500 12759.7 6500\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -6.787ex;\"><defs><path id=\"MJX-40-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 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404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-40-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-40-TEX-N-28\" d=\"M94 250Q94 319 104 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data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-40-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-40-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-40-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4149.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-40-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4538.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-40-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" 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data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(9462.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-40-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-40-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10365,0)\"><use data-c=\"29\" xlink:href=\"#MJX-40-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,850)\"><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-40-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-40-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-40-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4149.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-40-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4538.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-40-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5659.3,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-40-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6659.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-40-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-40-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7668.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-40-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-850)\"><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-40-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-40-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2111.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-40-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2500.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-40-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4111.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-40-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5316.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-40-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5705.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-40-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-40-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6935.9,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-40-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7936.2,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-40-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9546.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-40-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(10751.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-40-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2550)\"><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(1109,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-40-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-40-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2944.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-40-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4149.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-40-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-40-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5048.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-40-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.685ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7374.7 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-967-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-967-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-967-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-967-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-967-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 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620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-967-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-967-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-967-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-967-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2427.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-967-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-967-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3604.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-967-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4549.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-967-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-967-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5744.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-967-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6133.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-967-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6985.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-967-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_ix_i\\in B_0(X)<\/script>.<\/p>\n<\/li>\n\n<\/ul>\n<p>Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32.159ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 14214.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-968-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-968-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-968-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-968-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-968-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-968-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-968-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-968-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-968-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><path id=\"MJX-968-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-968-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-968-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-968-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-968-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-968-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(931.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-968-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1487.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-968-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-968-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2607.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-968-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2996.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-968-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3848.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-968-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4514.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-968-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(5792.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-968-TEX-D-2124\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6459.7,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-968-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6904.3,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-968-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8127,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-968-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-968-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(9331.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-968-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-968-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10508.7,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-968-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11786.5,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-968-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(13009.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-968-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-968-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi:Z_0(X)\\to \\mathbb Z,\\sum m_ix_i\\to \\sum m_i<\/script>. It&#39;s trivial that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.48ex\" height=\"1.493ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 654 660\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-969-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D711\" xlink:href=\"#MJX-969-TEX-I-1D711\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\varphi<\/script> is a homomorphism with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.677ex\" height=\"2.063ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 4277.2 912\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.493ex;\"><defs><path id=\"MJX-970-TEX-N-6B\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T97 124T98 167T98 217T98 272T98 329Q98 366 98 407T98 482T98 542T97 586T97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V463L180 233L240 287Q300 341 304 347Q310 356 310 364Q310 383 289 385H284V431H293Q308 428 412 428Q475 428 484 431H489V385H476Q407 380 360 341Q286 278 286 274Q286 273 349 181T420 79Q434 60 451 53T500 46H511V0H505Q496 3 418 3Q322 3 307 0H299V46H306Q330 48 330 65Q330 72 326 79Q323 84 276 153T228 222L176 176V120V84Q176 65 178 59T189 49Q210 46 238 46H254V0H246Q231 3 137 3T28 0H20V46H36Z\"><\/path><path id=\"MJX-970-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-970-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-970-TEX-N-2061\" d=\"\"><\/path><path id=\"MJX-970-TEX-I-1D711\" d=\"M92 210Q92 176 106 149T142 108T185 85T220 72L235 70L237 71L250 112Q268 170 283 211T322 299T370 375T429 423T502 442Q547 442 582 410T618 302Q618 224 575 152T457 35T299 -10Q273 -10 273 -12L266 -48Q260 -83 252 -125T241 -179Q236 -203 215 -212Q204 -218 190 -218Q159 -215 159 -185Q159 -175 214 -2L209 0Q204 2 195 5T173 14T147 28T120 46T94 71T71 103T56 142T50 190Q50 238 76 311T149 431H162Q183 431 183 423Q183 417 175 409Q134 361 114 300T92 210ZM574 278Q574 320 550 344T486 369Q437 369 394 329T323 218Q309 184 295 109L286 64Q304 62 306 62Q423 62 498 131T574 278Z\"><\/path><path id=\"MJX-970-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-970-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"6B\" xlink:href=\"#MJX-970-TEX-N-6B\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-970-TEX-N-65\" transform=\"translate(528,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-970-TEX-N-72\" transform=\"translate(972,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1364,0)\"><use data-c=\"2061\" xlink:href=\"#MJX-970-TEX-N-2061\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1530.7,0)\"><use data-c=\"1D711\" xlink:href=\"#MJX-970-TEX-I-1D711\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2462.4,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-970-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3518.2,0)\"><use data-c=\"1D435\" xlink:href=\"#MJX-970-TEX-I-1D435\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\ker \\varphi=B<\/script>.<\/p>\n<p>Consequently, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"27.843ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 12306.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-971-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-971-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-971-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-971-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-971-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-971-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-971-TEX-I-1D44D\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path id=\"MJX-971-TEX-N-2F\" d=\"M423 750Q432 750 438 744T444 730Q444 725 271 248T92 -240Q85 -250 75 -250Q68 -250 62 -245T56 -231Q56 -221 230 257T407 740Q411 750 423 750Z\"><\/path><path id=\"MJX-971-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-971-TEX-N-2245\" d=\"M55 388Q55 463 101 526T222 589Q260 589 296 571T362 526T421 474T484 430T554 411Q616 411 655 458T694 560Q694 572 698 580T708 589Q722 589 722 556Q722 482 677 419T562 356H554Q517 356 481 374T414 418T355 471T292 515T223 533Q179 533 145 508Q109 479 96 440T80 378T69 355Q55 355 55 388ZM56 236Q56 249 70 256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><path id=\"MJX-971-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-971-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-971-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-971-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-971-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-971-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-971-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4231.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-971-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-971-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5350.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-971-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5739.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-971-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6591.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-971-TEX-N-29\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(6980.7,0)\"><g data-mml-node=\"mo\"><use data-c=\"2F\" xlink:href=\"#MJX-971-TEX-N-2F\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(7480.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-971-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-971-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8676.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-971-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9065.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-971-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9917.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-971-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10584,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-971-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(11639.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-971-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_0(X)=Z_0(X)\/B_0(X)\\cong \\mathbb Z<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<p>Next, we will learn the homotopy axiom; that is if <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.33ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 1471.7 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-973-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-973-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-973-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-973-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(550,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-973-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(994.7,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-973-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f,g<\/script> are two homotopic continuous maps, then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.18ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 3173.7 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-974-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-974-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-974-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-974-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-974-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-974-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1204.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-974-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2260.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-974-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-974-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f_*=g_*<\/script>. However, we will not prove this theorem directly. Let us prove it step by step.<\/p>\n<blockquote><p><strong>3.5 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> be a bounded convex subset of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.655ex\" height=\"1.932ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -853.7 1173.4 853.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-976-TEX-D-211D\" d=\"M17 665Q17 672 28 683H221Q415 681 439 677Q461 673 481 667T516 654T544 639T566 623T584 607T597 592T607 578T614 565T618 554L621 548Q626 530 626 497Q626 447 613 419Q578 348 473 326L455 321Q462 310 473 292T517 226T578 141T637 72T686 35Q705 30 705 16Q705 7 693 -1H510Q503 6 404 159L306 310H268V183Q270 67 271 59Q274 42 291 38Q295 37 319 35Q344 35 353 28Q362 17 353 3L346 -1H28Q16 5 16 16Q16 35 55 35Q96 38 101 52Q106 60 106 341T101 632Q95 645 55 648Q17 648 17 665ZM241 35Q238 42 237 45T235 78T233 163T233 337V621L237 635L244 648H133Q136 641 137 638T139 603T141 517T141 341Q141 131 140 89T134 37Q133 36 133 35H241ZM457 496Q457 540 449 570T425 615T400 634T377 643Q374 643 339 648Q300 648 281 635Q271 628 270 610T268 481V346H284Q327 346 375 352Q421 364 439 392T457 496ZM492 537T492 496T488 427T478 389T469 371T464 361Q464 360 465 360Q469 360 497 370Q593 400 593 495Q593 592 477 630L457 637L461 626Q474 611 488 561Q492 537 492 496ZM464 243Q411 317 410 317Q404 317 401 315Q384 315 370 312H346L526 35H619L606 50Q553 109 464 243Z\"><\/path><path id=\"MJX-976-TEX-I-1D458\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"211D\" xlink:href=\"#MJX-976-TEX-D-211D\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(755,363) scale(0.707)\"><use data-c=\"1D458\" xlink:href=\"#MJX-976-TEX-I-1D458\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbb R^k<\/script>, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script> for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-984-TEX-N-2265\" d=\"M83 616Q83 624 89 630T99 636Q107 636 253 568T543 431T687 361Q694 356 694 346T687 331Q685 329 395 192L107 56H101Q83 58 83 76Q83 77 83 79Q82 86 98 95Q117 105 248 167Q326 204 378 228L626 346L360 472Q291 505 200 548Q112 589 98 597T83 616ZM84 -118Q84 -108 99 -98H678Q694 -104 694 -118Q694 -130 679 -138H98Q84 -131 84 -118Z\"><\/path><path id=\"MJX-984-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-984-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-984-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-984-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 1<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Fix a point <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.664ex\" height=\"1.661ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 2503.6 734\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-979-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-979-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-979-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-979-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(706.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-979-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1651.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-979-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">b\\in X<\/script>. Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> be a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex.<\/p>\n<p>For all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-982-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 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transform=\"translate(1445,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-41-TEX-N-72\" transform=\"translate(1889,0)\"><\/use><use data-c=\"77\" xlink:href=\"#MJX-41-TEX-N-77\" transform=\"translate(2281,0)\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-41-TEX-N-69\" transform=\"translate(3003,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-41-TEX-N-73\" transform=\"translate(3281,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-41-TEX-N-65\" transform=\"translate(3675,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4119,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-41-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(19564.3,0) translate(0 250)\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>And then define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n304\" cid=\"n304\" mdtype=\"math_block\" data-math-tag-before=\"0\" 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data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-42-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-42-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4371.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-42-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4760.2,0)\"><use data-c=\"1D44F\" xlink:href=\"#MJX-42-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5189.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-42-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5633.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-42-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-42-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6531.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-42-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6920.8,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-42-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>It&#39;s easy to check <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.127ex\" height=\"1.357ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 940.3 599.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-983-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><path id=\"MJX-983-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-983-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-983-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">c_n<\/script>\u200b is a homomorphism.<\/p>\n<p>When <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.819ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 804\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.312ex;\"><defs><path id=\"MJX-984-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 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data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"2265\" xlink:href=\"#MJX-984-TEX-N-2265\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-984-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n\\ge 1<\/script>, we claim that, for a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-chain <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.229ex\" height=\"1.486ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -441 543 657\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-1179-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1179-TEX-I-1D6FE\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma<\/script>,<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n307\" cid=\"n307\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container 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transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-43-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(6992.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-43-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7558.2,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-43-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8101.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-43-TEX-N-2E\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(8379.2,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(10379.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-43-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-43-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-43-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 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transform=\"translate(2877.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-988-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3266.8,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-988-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4118.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-988-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z\\in Z_n(X)<\/script>,\u200b<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n309\" cid=\"n309\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.257ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 10721.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-44-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-44-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 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420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-44-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-44-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-44-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-44-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-44-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-44-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-44-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(566,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-44-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-44-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(1506.3,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-44-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2249,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-44-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3304.8,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-44-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3992,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-44-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4992.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-44-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(466,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-44-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-44-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-44-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6836.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-44-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7225.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-44-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7791.2,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-44-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8256.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-44-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8923,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-44-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9978.8,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-44-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10443.8,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-44-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Consequently, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.371ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4583.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-989-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-989-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-989-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-989-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-989-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-989-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-989-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D467\" xlink:href=\"#MJX-989-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(742.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-989-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1687.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-989-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-989-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2953.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-989-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3342.8,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-989-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4194.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-989-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">z\\in B_n(X)<\/script>; hence, the lemma has been proved.<\/p>\n<p>Next, we will prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1072-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-1072-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1072-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1072-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(*)<\/script>.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> be a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex. And then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n313\" cid=\"n313\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"27.663ex\" height=\"14.103ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3366.8 12227.1 6233.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -6.486ex;\"><defs><path id=\"MJX-45-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-45-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><path id=\"MJX-45-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-45-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-45-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-45-TEX-LO-2211\" d=\"M60 948Q63 950 665 950H1267L1325 815Q1384 677 1388 669H1348L1341 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data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-45-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(566,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-45-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-45-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(1506.3,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-45-TEX-I-1D70E\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2077.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-45-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"munderover\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-45-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(148.2,-1087.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g 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transform=\"translate(7174.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-45-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7563.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-45-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-45-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-1620.9)\"><g data-mml-node=\"mtd\" transform=\"translate(2077.3,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(2077.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-45-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-45-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2126.8,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-45-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"munderover\" transform=\"translate(3127,0)\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-45-TEX-LO-2211\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(148.2,-1087.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-45-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-45-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"31\" xlink:href=\"#MJX-45-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(58,1150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-45-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-45-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-45-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4571,0)\"><use data-c=\"28\" xlink:href=\"#MJX-45-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4960,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-45-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(5738,0)\"><use data-c=\"31\" xlink:href=\"#MJX-45-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(6238,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-45-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,413) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-45-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7134.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-45-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7523.3,0)\"><use data-c=\"1D44F\" xlink:href=\"#MJX-45-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7952.3,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-45-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8396.9,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-45-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8967.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-45-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9356.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-45-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-45-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>; and<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n315\" cid=\"n315\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"19.336ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8546.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-46-TEX-I-1D44F\" d=\"M73 647Q73 657 77 670T89 683Q90 683 161 688T234 694Q246 694 246 685T212 542Q204 508 195 472T180 418L176 399Q176 396 182 402Q231 442 283 442Q345 442 383 396T422 280Q422 169 343 79T173 -11Q123 -11 82 27T40 150V159Q40 180 48 217T97 414Q147 611 147 623T109 637Q104 637 101 637H96Q86 637 83 637T76 640T73 647ZM336 325V331Q336 405 275 405Q258 405 240 397T207 376T181 352T163 330L157 322L136 236Q114 150 114 114Q114 66 138 42Q154 26 178 26Q211 26 245 58Q270 81 285 114T318 219Q336 291 336 325Z\"><\/path><path id=\"MJX-46-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-46-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-46-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-46-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-46-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-46-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-46-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-46-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-46-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44F\" xlink:href=\"#MJX-46-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(429,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-46-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(873.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-46-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1262.7,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-46-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1833.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-46-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-46-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2626.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-46-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3293.4,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-46-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4349.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-46-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4738.2,0)\"><use data-c=\"1D44F\" xlink:href=\"#MJX-46-TEX-I-1D44F\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5167.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-46-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5611.8,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-46-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6182.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-46-TEX-N-29\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6571.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-46-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(499,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-46-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(345,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-46-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1123,0)\"><use data-c=\"31\" xlink:href=\"#MJX-46-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8268.5,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-46-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Thus, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.519ex\" height=\"2.088ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 8185.2 923\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.471ex;\"><defs><path id=\"MJX-993-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-993-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><path id=\"MJX-993-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-993-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-993-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-993-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-993-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-993-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(566,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-993-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(466,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-993-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(1506.3,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-993-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2355,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-993-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3410.8,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-993-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4204,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-993-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5204.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-993-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(466,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-993-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-993-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-993-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(7048.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-993-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7614.2,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-993-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial c_n\\sigma=\\sigma-c_{n-1}\\partial\\sigma<\/script>. <\/p>\n<p>By using the universal property of free abelian groups, we proved <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1072-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-1072-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1072-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1072-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(*)<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script>\u200b<\/p>\n<\/blockquote>\n<blockquote><p><strong>3.6 Definition.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.217ex\" height=\"2.22ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 2747.8 981.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.503ex;\"><defs><path id=\"MJX-996-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-996-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-996-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-996-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-996-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-996-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1151.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-996-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1596.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-996-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-996-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-996-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">C_*,C_*'<\/script> be two chain complexes, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script>\u200b be chain maps. We call <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script> are <strong>(chain) homotopic<\/strong> if there are homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.581ex\" height=\"2.431ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 6886.6 1074.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.714ex;\"><defs><path id=\"MJX-1001-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1001-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1001-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1001-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-1001-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1001-TEX-V-2032\" d=\"M79 43Q73 43 52 49T30 61Q30 68 85 293T146 528Q161 560 198 560Q218 560 240 545T262 501Q262 496 260 486Q259 479 173 263T84 45T79 43Z\"><\/path><path id=\"MJX-1001-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1001-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1001-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1001-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1427,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1001-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1982.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-1001-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1001-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3482.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1001-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(4760.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-1001-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-1001-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-257.5) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1001-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1001-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1001-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n:C_n\\to C_{n+1}'<\/script> such that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.838ex\" height=\"2.088ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 10094.2 923\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.471ex;\"><defs><path id=\"MJX-1002-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-1002-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1002-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1002-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1002-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1002-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1002-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1002-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1002-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-1002-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(566,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1002-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1002-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1937.5,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1002-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2937.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1002-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1002-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1002-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1002-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(4990.7,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-1002-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5834.4,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1002-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6890.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1002-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1002-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8109.7,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1002-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9109.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1002-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(510,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1002-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial P_{n}+P_{n-1}\\partial=f_n-g_n<\/script>\u200b\u200b for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>. <\/p>\n<p>The following diagram is NOT commutative.<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n322\" cid=\"n322\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"42.249ex\" height=\"14.936ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1454 18674.2 6601.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -11.646ex;\"><defs><path id=\"MJX-47-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-47-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-47-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-47-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-47-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 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630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-47-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-47-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 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data-c=\"2032\" xlink:href=\"#MJX-47-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(748,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-47-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"12.648210603780266\" data-y=\"4.315471175493114\" data-xypic-id=\"14\" transform=\"translate(13048.2,-4065.5)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-47-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(845.3,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-47-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(748,-257.5) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-47-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-47-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-47-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"17.874157138848602\" data-y=\"4.093736417129139\" data-xypic-id=\"15\" transform=\"translate(18274.2,-3843.7)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<blockquote><p><strong>3.7 Theorem.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script> are chain homotopic, then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.916ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6593.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1013-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1013-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1013-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1013-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1013-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1013-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1013-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1013-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1013-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1013-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1013-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1013-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2944,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1013-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3999.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1013-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1013-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5338.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1013-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5727.1,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1013-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6204.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1013-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(f)=H_n(g)<\/script> for each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.113ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6238 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1008-TEX-N-63\" d=\"M370 305T349 305T313 320T297 358Q297 381 312 396Q317 401 317 402T307 404Q281 408 258 408Q209 408 178 376Q131 329 131 219Q131 137 162 90Q203 29 272 29Q313 29 338 55T374 117Q376 125 379 127T395 129H409Q415 123 415 120Q415 116 411 104T395 71T366 33T318 2T249 -11Q163 -11 99 53T34 214Q34 318 99 383T250 448T370 421T404 357Q404 334 387 320Z\"><\/path><path id=\"MJX-1008-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-1008-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><path id=\"MJX-1008-TEX-I-1D467\" d=\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"><\/path><path id=\"MJX-1008-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1008-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1008-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1008-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1008-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-1008-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1008-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"63\" xlink:href=\"#MJX-1008-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1008-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-1008-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1282.7,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-1008-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2025.4,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1008-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2970.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1008-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1008-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4308.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1008-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4697.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D436\" xlink:href=\"#MJX-1008-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(748,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1008-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5849,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1008-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\operatorname{cls} z\\in H_n(C_*)<\/script>, and then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n328\" cid=\"n328\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"50.163ex\" height=\"14.027ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3350 22171.8 6200\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -6.448ex;\"><defs><path id=\"MJX-48-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-48-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-48-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 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xlink:href=\"#MJX-48-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-48-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10188.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-48-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(10577.2,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-48-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(11143.2,0)\"><use data-c=\"1D467\" xlink:href=\"#MJX-48-TEX-I-1D467\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11608.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-48-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11997.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-48-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2600)\"><g data-mml-node=\"mtd\" transform=\"translate(9785.6,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(9785.6,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-48-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1333.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-48-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(1833.6,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-48-TEX-N-A0\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2083.6,0)\"><use data-c=\"25FB\" xlink:href=\"#MJX-48-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<blockquote><p><strong>3.8 Lemma.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> be a space and, for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.066ex\" height=\"1.946ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 3123.2 860\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1010-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1010-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1010-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1010-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1010-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-1010-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(622.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1010-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1678.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1010-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2178.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1010-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2623.2,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1010-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i=0,1<\/script>, define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n332\" cid=\"n332\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.665ex\" height=\"5.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1475.4 7366 2450.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.207ex;\"><defs><path id=\"MJX-49-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-49-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-49-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-49-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-49-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-49-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-49-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-49-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-49-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-49-TEX-N-21A6\" d=\"M95 155V109Q95 83 92 73T75 63Q61 63 58 74T54 130Q54 140 54 180T55 250Q55 421 57 425Q61 437 75 437Q88 437 91 428T95 393V345V270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><path id=\"MJX-49-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-49-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-49-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,579.4)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-49-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-49-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,-247) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-49-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1546.2,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-49-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2102,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-49-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2954,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-49-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1555.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-49-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2629.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-49-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3630,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-49-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4134,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-49-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-725.4)\"><g data-mml-node=\"mtd\" transform=\"translate(2382,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-49-TEX-I-1D465\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2954,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-49-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1555.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-49-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1944.6,0)\"><use data-c=\"1D465\" xlink:href=\"#MJX-49-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2516.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-49-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2961.2,0)\"><use data-c=\"1D456\" xlink:href=\"#MJX-49-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3306.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-49-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3695.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-49-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.389ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 5475.8 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1020-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1020-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1020-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1020-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1020-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1020-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1020-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1020-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(550,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1020-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(994.7,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1020-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1749.4,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1020-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2305.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1020-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3435,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1020-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4712.8,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1020-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f,g:X\\to Y<\/script> be two homotopic continuous maps.<\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.333ex\" height=\"2.601ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 8103 1149.4\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.687ex;\"><defs><path id=\"MJX-1012-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1012-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1012-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1012-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-1012-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1012-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1012-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1012-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1012-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1012-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1012-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1012-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-1012-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1012-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(616,-287.9) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1012-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2995.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1012-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3662.5,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1012-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4718.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1012-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1012-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6056.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1012-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6445.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-1012-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1012-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(616,-287.9) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1012-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7714,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1012-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(\\lambda_0^X)=H_n(\\lambda_1^X)<\/script>, then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.916ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6593.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1013-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1013-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1013-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1013-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1013-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1013-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1013-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1013-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1013-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1013-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1013-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1013-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2944,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1013-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3999.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1013-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1013-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5338.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1013-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5727.1,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1013-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6204.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1013-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(f)=H_n(g)<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.921ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 3943.1 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1014-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-1014-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1014-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1014-TEX-N-2243\" d=\"M55 283Q55 356 103 409T217 463Q262 463 297 447T395 382Q431 355 446 344T493 320T554 307H558Q613 307 652 344T694 433Q694 464 708 464T722 432Q722 356 673 304T564 251H554Q510 251 465 275T387 329T310 382T223 407H219Q164 407 122 367Q91 333 85 295T76 253T69 250Q55 250 55 283ZM56 56Q56 71 72 76H706Q722 70 722 56Q722 44 707 36H70Q56 43 56 56Z\"><\/path><path id=\"MJX-1014-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-1014-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1026.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1014-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1582.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1014-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2410.3,0)\"><use data-c=\"2243\" xlink:href=\"#MJX-1014-TEX-N-2243\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3466.1,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1014-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">F:f\\simeq g<\/script> be the homotopy. Then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n337\" cid=\"n337\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"23.19ex\" height=\"15.405ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3654.5 10249.8 6808.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -7.137ex;\"><defs><path id=\"MJX-50-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-50-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-50-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-50-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-50-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-50-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-50-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-50-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-50-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-50-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-50-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-50-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-50-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-50-TEX-N-A0\" d=\"\"><\/path><path id=\"MJX-50-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,2758.5)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-50-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-50-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-50-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-50-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-50-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2666.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-50-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-50-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" 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data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-50-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-50-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5537.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-50-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(5926.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-50-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-50-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(616,-247) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-50-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7194.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-50-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-158.5)\"><g 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data-mml-node=\"mtd\" transform=\"translate(2666.3,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(2666.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-50-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-50-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-50-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2671.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-50-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3060.8,0)\"><use data-c=\"1D439\" xlink:href=\"#MJX-50-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(3809.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-50-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-50-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(616,-247) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-50-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5078.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-50-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2904.5)\"><g data-mml-node=\"mtd\" transform=\"translate(2666.3,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(2666.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-50-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-50-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-50-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2671.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-50-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3060.8,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-50-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3537.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-50-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3926.8,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-50-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(4371.5,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-50-TEX-N-A0\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4621.5,0)\"><use data-c=\"25FB\" xlink:href=\"#MJX-50-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<blockquote><p><strong>3.9 Definition.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"4.793ex\" height=\"2.086ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -728 2118.7 922\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1015-TEX-S-1D49E\" d=\"M367 89Q367 84 353 77T334 70Q325 70 312 83T298 120Q298 169 364 233T496 298Q538 298 563 275T588 220V213Q588 132 501 53T306 -26Q251 -26 211 6T170 114Q171 148 181 184T205 248T232 298T255 334T265 349T246 350Q127 350 77 390T26 480Q26 533 71 581T178 656T295 683Q312 683 312 676Q312 674 311 672L302 660Q294 648 292 647L286 646Q280 646 276 646Q197 641 145 583T93 476Q93 387 265 387Q271 387 277 387T287 388T292 388T313 414T373 483T451 562Q618 712 732 727Q733 727 740 727T753 728Q790 727 804 708T819 665Q819 643 810 617T773 553T699 481T572 414T385 361Q381 361 367 341Q247 172 247 86Q247 11 325 11Q404 11 465 95Q518 165 528 208Q529 212 529 220Q529 237 518 249T480 261Q431 261 387 209T343 126Q343 111 355 101T367 89ZM777 658Q777 691 738 691Q704 691 658 662T570 590T491 504T432 432T410 400H411Q416 400 440 405T505 423T589 455T675 506T743 576Q777 627 777 658Z\"><\/path><path id=\"MJX-1015-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1015-TEX-S-1D49F\" d=\"M251 272Q199 272 168 298T136 374Q136 432 175 496T267 603Q321 645 395 676T552 708Q610 708 655 694T724 659T763 618T784 584L790 569Q792 569 800 572T819 576T840 578Q855 578 855 571Q855 566 846 554T829 541Q824 541 817 539T804 533T799 529Q802 517 802 483Q802 376 742 256T585 53T392 -31Q353 -31 300 -7L289 -2L277 -6Q242 -17 192 -17Q141 -17 113 -13T77 -3T68 14Q68 20 73 28T93 45T131 58Q152 62 197 62Q241 62 272 48L282 44Q308 65 334 93Q380 145 467 266T622 454Q644 476 664 493T694 517T720 534T740 547Q699 671 540 671Q461 671 385 625T276 534Q265 520 251 499T219 438T202 368Q202 309 267 309Q325 309 396 383T491 545Q492 548 493 552Q494 558 496 559T511 564Q513 565 514 565Q523 568 527 568Q534 568 534 560Q534 554 529 537Q507 442 420 357T251 272ZM332 20Q332 19 341 15T368 6T400 2Q425 2 457 13T531 49T614 125T690 248Q750 376 750 476V490L738 479Q698 436 646 366T554 239T455 121T332 20ZM226 20Q226 25 186 25Q181 25 174 24H166Q161 24 158 23H152Q170 21 197 21Q205 21 213 21T223 20H226Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D49E\" xlink:href=\"#MJX-1015-TEX-S-1D49E\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(819,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1015-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(1263.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D49F\" xlink:href=\"#MJX-1015-TEX-S-1D49F\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathscr C,\\mathscr D<\/script> be two categories, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.671ex\" height=\"2.086ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -728 6042.8 922\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1016-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-1016-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1016-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><path id=\"MJX-1016-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1016-TEX-S-1D49E\" d=\"M367 89Q367 84 353 77T334 70Q325 70 312 83T298 120Q298 169 364 233T496 298Q538 298 563 275T588 220V213Q588 132 501 53T306 -26Q251 -26 211 6T170 114Q171 148 181 184T205 248T232 298T255 334T265 349T246 350Q127 350 77 390T26 480Q26 533 71 581T178 656T295 683Q312 683 312 676Q312 674 311 672L302 660Q294 648 292 647L286 646Q280 646 276 646Q197 641 145 583T93 476Q93 387 265 387Q271 387 277 387T287 388T292 388T313 414T373 483T451 562Q618 712 732 727Q733 727 740 727T753 728Q790 727 804 708T819 665Q819 643 810 617T773 553T699 481T572 414T385 361Q381 361 367 341Q247 172 247 86Q247 11 325 11Q404 11 465 95Q518 165 528 208Q529 212 529 220Q529 237 518 249T480 261Q431 261 387 209T343 126Q343 111 355 101T367 89ZM777 658Q777 691 738 691Q704 691 658 662T570 590T491 504T432 432T410 400H411Q416 400 440 405T505 423T589 455T675 506T743 576Q777 627 777 658Z\"><\/path><path id=\"MJX-1016-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1016-TEX-S-1D49F\" d=\"M251 272Q199 272 168 298T136 374Q136 432 175 496T267 603Q321 645 395 676T552 708Q610 708 655 694T724 659T763 618T784 584L790 569Q792 569 800 572T819 576T840 578Q855 578 855 571Q855 566 846 554T829 541Q824 541 817 539T804 533T799 529Q802 517 802 483Q802 376 742 256T585 53T392 -31Q353 -31 300 -7L289 -2L277 -6Q242 -17 192 -17Q141 -17 113 -13T77 -3T68 14Q68 20 73 28T93 45T131 58Q152 62 197 62Q241 62 272 48L282 44Q308 65 334 93Q380 145 467 266T622 454Q644 476 664 493T694 517T720 534T740 547Q699 671 540 671Q461 671 385 625T276 534Q265 520 251 499T219 438T202 368Q202 309 267 309Q325 309 396 383T491 545Q492 548 493 552Q494 558 496 559T511 564Q513 565 514 565Q523 568 527 568Q534 568 534 560Q534 554 529 537Q507 442 420 357T251 272ZM332 20Q332 19 341 15T368 6T400 2Q425 2 457 13T531 49T614 125T690 248Q750 376 750 476V490L738 479Q698 436 646 366T554 239T455 121T332 20ZM226 20Q226 25 186 25Q181 25 174 24H166Q161 24 158 23H152Q170 21 197 21Q205 21 213 21T223 20H226Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-1016-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(749,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1016-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1193.7,0)\"><use data-c=\"1D43A\" xlink:href=\"#MJX-1016-TEX-I-1D43A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2257.4,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1016-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(2813.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D49E\" xlink:href=\"#MJX-1016-TEX-S-1D49E\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3910,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1016-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(5187.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D49F\" xlink:href=\"#MJX-1016-TEX-S-1D49F\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">F,G:\\mathscr C\\to \\mathscr D<\/script> be two (covariant) functors. A <strong>natural transformation<\/strong>  <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.939ex\" height=\"1.645ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4393.1 727\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.05ex;\"><defs><path id=\"MJX-1017-TEX-I-1D703\" d=\"M35 200Q35 302 74 415T180 610T319 704Q320 704 327 704T339 705Q393 701 423 656Q462 596 462 495Q462 380 417 261T302 66T168 -10H161Q125 -10 99 10T60 63T41 130T35 200ZM383 566Q383 668 330 668Q294 668 260 623T204 521T170 421T157 371Q206 370 254 370L351 371Q352 372 359 404T375 484T383 566ZM113 132Q113 26 166 26Q181 26 198 36T239 74T287 161T335 307L340 324H145Q145 321 136 286T120 208T113 132Z\"><\/path><path id=\"MJX-1017-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1017-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-1017-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1017-TEX-I-1D43A\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q492 659 471 656T418 643T357 615T294 567T236 496T189 394T158 260Q156 242 156 221Q156 173 170 136T206 79T256 45T308 28T353 24Q407 24 452 47T514 106Q517 114 529 161T541 214Q541 222 528 224T468 227H431Q425 233 425 235T427 254Q431 267 437 273H454Q494 271 594 271Q634 271 659 271T695 272T707 272Q721 272 721 263Q721 261 719 249Q714 230 709 228Q706 227 694 227Q674 227 653 224Q646 221 643 215T629 164Q620 131 614 108Q589 6 586 3Q584 1 581 1Q571 1 553 21T530 52Q530 53 528 52T522 47Q448 -22 322 -22Q201 -22 126 55T50 252Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D703\" xlink:href=\"#MJX-1017-TEX-I-1D703\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(746.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1017-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1302.6,0)\"><use data-c=\"1D439\" xlink:href=\"#MJX-1017-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2329.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1017-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3607.1,0)\"><use data-c=\"1D43A\" xlink:href=\"#MJX-1017-TEX-I-1D43A\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\theta:F\\to G<\/script> is a collection of morphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg 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data-mml-node=\"mi\" transform=\"translate(1175,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-51-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1725,0)\"><use data-c=\"29\" xlink:href=\"#MJX-51-TEX-N-29\"><\/use><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"-1.145\" data-y=\"4.35\" data-xypic-id=\"5\" transform=\"translate(1056.5,-4100)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-51-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(749,0)\"><use data-c=\"28\" xlink:href=\"#MJX-51-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1138,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-51-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1901,0)\"><use data-c=\"29\" xlink:href=\"#MJX-51-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"2.362838528392513\" data-y=\"4.989931636973825\" data-xypic-id=\"6\" transform=\"translate(4564.3,-4739.9)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D703\" xlink:href=\"#MJX-51-TEX-I-1D703\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(502,-150) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-51-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"4.334\" data-y=\"4.35\" data-xypic-id=\"7\" transform=\"translate(6535.5,-4100)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D43A\" xlink:href=\"#MJX-51-TEX-I-1D43A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(786,0)\"><use data-c=\"28\" xlink:href=\"#MJX-51-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1175,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-51-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1938,0)\"><use data-c=\"29\" xlink:href=\"#MJX-51-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commute.<\/p>\n<\/blockquote>\n<blockquote><p><strong>3.10 Theorem (Homotopy Axiom).<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.389ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 5475.8 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1020-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1020-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1020-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1020-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1020-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1020-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1020-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1020-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(550,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1020-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(994.7,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1020-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1749.4,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1020-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2305.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1020-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3435,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1020-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4712.8,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1020-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f,g:X\\to Y<\/script> be two homotopic continuous maps, then<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n346\" cid=\"n346\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.545ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6871.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-52-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-52-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-52-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-52-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-52-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-52-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-52-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-52-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-52-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-52-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-52-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-52-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-52-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2944,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-52-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3999.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-52-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-52-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5338.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-52-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5727.1,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-52-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6204.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-52-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6593.1,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-52-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p><strong>Notations:<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21.147ex\" height=\"2.084ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 9346.9 921\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1021-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1021-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1021-TEX-I-1D434\" d=\"M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z\"><\/path><path id=\"MJX-1021-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1021-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1021-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1021-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1021-TEX-I-1D436\" d=\"M50 252Q50 367 117 473T286 641T490 704Q580 704 633 653Q642 643 648 636T656 626L657 623Q660 623 684 649Q691 655 699 663T715 679T725 690L740 705H746Q760 705 760 698Q760 694 728 561Q692 422 692 421Q690 416 687 415T669 413H653Q647 419 647 422Q647 423 648 429T650 449T651 481Q651 552 619 605T510 659Q484 659 454 652T382 628T299 572T226 479Q194 422 175 346T156 222Q156 108 232 58Q280 24 350 24Q441 24 512 92T606 240Q610 253 612 255T628 257Q648 257 648 248Q648 243 647 239Q618 132 523 55T319 -22Q206 -22 128 53T50 252Z\"><\/path><path id=\"MJX-1021-TEX-I-1D437\" d=\"M287 628Q287 635 230 637Q207 637 200 638T193 647Q193 655 197 667T204 682Q206 683 403 683Q570 682 590 682T630 676Q702 659 752 597T803 431Q803 275 696 151T444 3L430 1L236 0H125H72Q48 0 41 2T33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM703 469Q703 507 692 537T666 584T629 613T590 629T555 636Q553 636 541 636T512 636T479 637H436Q392 637 386 627Q384 623 313 339T242 52Q242 48 253 48T330 47Q335 47 349 47T373 46Q499 46 581 128Q617 164 640 212T683 339T703 469Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1021-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1021-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-1021-TEX-I-1D434\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2411.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1021-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3689.1,0)\"><use data-c=\"1D435\" xlink:href=\"#MJX-1021-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4448.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1021-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4892.8,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1021-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5647.6,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1021-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6203.3,0)\"><use data-c=\"1D436\" xlink:href=\"#MJX-1021-TEX-I-1D436\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7241.1,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1021-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8518.9,0)\"><use data-c=\"1D437\" xlink:href=\"#MJX-1021-TEX-I-1D437\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:A\\to B,g:C\\to D<\/script> are maps. Define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n349\" cid=\"n349\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"28.092ex\" height=\"5.204ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1400 12416.7 2300\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.036ex;\"><defs><path id=\"MJX-53-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-53-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-53-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 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xlink:href=\"#MJX-53-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.134ex\" height=\"1.645ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 4479.1 727\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1022-TEX-I-210E\" d=\"M137 683Q138 683 209 688T282 694Q294 694 294 685Q294 674 258 534Q220 386 220 383Q220 381 227 388Q288 442 357 442Q411 442 444 415T478 336Q478 285 440 178T402 50Q403 36 407 31T422 26Q450 26 474 56T513 138Q516 149 519 151T535 153Q555 153 555 145Q555 144 551 130Q535 71 500 33Q466 -10 419 -10H414Q367 -10 346 17T325 74Q325 90 361 192T398 345Q398 404 354 404H349Q266 404 205 306L198 293L164 158Q132 28 127 16Q114 -11 83 -11Q69 -11 59 -2T48 16Q48 30 121 320L195 616Q195 629 188 632T149 637H128Q122 643 122 645T124 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213Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"210E\" xlink:href=\"#MJX-1022-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(853.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1022-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1409.6,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-1022-TEX-I-1D434\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2437.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1022-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3715.1,0)\"><use data-c=\"1D438\" xlink:href=\"#MJX-1022-TEX-I-1D438\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">h:A\\to E<\/script> is a map. 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422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"><\/path><path id=\"MJX-54-TEX-N-21A6\" d=\"M95 155V109Q95 83 92 73T75 63Q61 63 58 74T54 130Q54 140 54 180T55 250Q55 421 57 425Q61 437 75 437Q88 437 91 428T95 393V345V270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><path id=\"MJX-54-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,650)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-54-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-54-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(939,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-54-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.7,0)\"><use data-c=\"210E\" xlink:href=\"#MJX-54-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1959.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-54-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2626.4,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-54-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3182.2,0)\"><use data-c=\"1D434\" xlink:href=\"#MJX-54-TEX-I-1D434\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3932.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-54-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1555.6,0)\"><use data-c=\"1D435\" xlink:href=\"#MJX-54-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2536.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-54-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3537,0)\"><use data-c=\"1D438\" xlink:href=\"#MJX-54-TEX-I-1D438\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4301,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-54-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-650)\"><g data-mml-node=\"mtd\" transform=\"translate(3403.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44E\" xlink:href=\"#MJX-54-TEX-I-1D44E\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(3932.2,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-54-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1555.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-54-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1944.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-54-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2494.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-54-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2883.6,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-54-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3412.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-54-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3801.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-54-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4246.2,0)\"><use data-c=\"210E\" xlink:href=\"#MJX-54-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4822.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-54-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5211.2,0)\"><use data-c=\"1D44E\" xlink:href=\"#MJX-54-TEX-I-1D44E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5740.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-54-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6129.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-54-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6518.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-54-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p><strong>Proof.<\/strong><\/p>\n<p>As what we discussed above (3.5, 3.6 and 3.7), it&#39;s sufficient to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.639ex\" height=\"2.921ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 1608.6 1290.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.007ex;\"><defs><path id=\"MJX-1023-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-1023-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1023-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1023-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-1023-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1023-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(616,-307.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-1023-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(500,0)\"><use data-c=\"23\" xlink:href=\"#MJX-1023-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\lambda_{0\\#}^X<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.639ex\" height=\"2.921ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 1608.6 1290.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.007ex;\"><defs><path id=\"MJX-1024-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-1024-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1024-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1024-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-1024-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1024-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(616,-307.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1024-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(500,0)\"><use data-c=\"23\" xlink:href=\"#MJX-1024-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\lambda_{1\\#}^X<\/script> are chain homotopic.<\/p>\n<p>Define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21.347ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9435.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1025-TEX-I-1D447\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path id=\"MJX-1025-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1025-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1025-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1025-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1025-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1025-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-1025-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1025-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1025-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1025-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D447\" xlink:href=\"#MJX-1025-TEX-I-1D447\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(617,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1025-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1091.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1025-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1480.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1025-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2332.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1025-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2999,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1025-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4054.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1025-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1025-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1025-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1025-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6078.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1025-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6467.8,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1025-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7542,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1025-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8542.2,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1025-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9046.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1025-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">T_n(X)=S_{n+1}(X\\times I)<\/script>, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"17.747ex\" height=\"2.347ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7844 1037.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.65ex;\"><defs><path id=\"MJX-1026-TEX-I-1D447\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path id=\"MJX-1026-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1026-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 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170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D447\" xlink:href=\"#MJX-1026-TEX-I-1D447\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(617,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1026-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1020.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1026-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1409.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1026-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1959.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1026-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2626.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1026-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3682.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1026-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4071.1,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1026-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4843.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1026-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5843.6,0)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1026-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(533,-150) scale(0.707)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1026-TEX-I-1D43C\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(6782.9,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-1026-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-1026-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">T_*(f)=(f\\times 1_I)_\\#<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> is a continuous map.<\/p>\n<p>It&#39;s easy to check <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.842ex\" height=\"2.018ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -698 7002.4 892\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1028-TEX-I-1D447\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path id=\"MJX-1028-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1028-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1028-TEX-B-1D413\" d=\"M41 425Q41 426 51 545T62 669V675H737V669Q738 665 748 546T758 425V419H696V425Q687 517 669 555T595 607Q578 612 522 613H478V62H631V0H615Q585 3 399 3Q214 3 184 0H168V62H321V613H277H263Q164 613 134 561Q113 527 103 425V419H41V425Z\"><\/path><path id=\"MJX-1028-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-1028-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><path id=\"MJX-1028-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 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data-mjx-texclass=\"ORD\" transform=\"translate(5494.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D400\" xlink:href=\"#MJX-1028-TEX-B-1D400\"><\/use><use data-c=\"1D41B\" xlink:href=\"#MJX-1028-TEX-B-1D41B\" transform=\"translate(869,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">T_n:\\mathbf{Top}\\to \\mathbf{Ab}<\/script> is a functor. <\/p>\n<p>Actually, we will construct natural transformations <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"29.039ex\" height=\"2.49ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 12835.4 1100.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path id=\"MJX-1029-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 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type=\"math\/tex\">P_n=\\{P^X_n:S_n(X)\\to T_n(X)\\}<\/script> such that<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n357\" cid=\"n357\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"34.453ex\" height=\"2.921ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -895.4 15228.4 1290.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.895ex;\"><defs><path id=\"MJX-55-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 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data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-55-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-55-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.6ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1149.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1075-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 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data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-56-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-56-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-56-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2023.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-56-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2412.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-56-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3264.9,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-56-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4042.9,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-56-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4546.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-56-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"10.034526658127444\" data-y=\"2.213632034355964\" data-xypic-id=\"5\" transform=\"translate(11809.7,-1963.6)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-56-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-56-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(939,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-56-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1717,0)\"><use data-c=\"31\" xlink:href=\"#MJX-56-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2217,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-56-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-56-TEX-N-23\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"-1.3306320343559643\" data-y=\"4.35\" data-xypic-id=\"6\" transform=\"translate(444.5,-4100)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-56-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-56-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1120.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-56-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1509.3,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-56-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2272.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-56-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"4.3163345876818795\" data-y=\"5.0896011178080265\" data-xypic-id=\"7\" transform=\"translate(6091.5,-4839.6)\"><g data-mml-node=\"mstyle\" transform=\"scale(0.707)\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-56-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-56-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-56-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"7.219632034355967\" data-y=\"4.35\" data-xypic-id=\"9\" transform=\"translate(8994.8,-4100)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-56-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-56-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-56-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-56-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2023.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-56-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2412.9,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-56-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.9,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-56-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3953.9,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-56-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4457.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-56-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>. Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.474ex\" height=\"1.647ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -717 5513.6 728\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1031-TEX-I-1D6FF\" d=\"M195 609Q195 656 227 686T302 717Q319 716 351 709T407 697T433 690Q451 682 451 662Q451 644 438 628T403 612Q382 612 348 641T288 671T249 657T235 628Q235 584 334 463Q401 379 401 292Q401 169 340 80T205 -10H198Q127 -10 83 36T36 153Q36 286 151 382Q191 413 252 434Q252 435 245 449T230 481T214 521T201 566T195 609ZM112 130Q112 83 136 55T204 27Q233 27 256 51T291 111T309 178T316 232Q316 267 309 298T295 344T269 400L259 396Q215 381 183 342T137 256T118 179T112 130Z\"><\/path><path id=\"MJX-1031-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1031-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1031-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1031-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1031-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(721.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1031-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1277.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1031-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1031-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2895.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1031-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(4173.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1031-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1031-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\delta:\\Delta^n\\to \\Delta^n<\/script> be the identity map and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> be a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script>. (We will use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.885ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 833 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1035-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1035-TEX-N-394\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta<\/script> in short for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.032ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 1340.3 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1036-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1036-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1036-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1036-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n<\/script> in the remaining part of this proof.)<\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.699ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 751 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1040-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1040-TEX-I-1D443\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P<\/script> exists, we can notice that<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n362\" 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scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-57-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-57-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1491.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-57-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1880.9,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-57-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2451.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-57-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(2840.9,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-57-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-57-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" 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transform=\"translate(2840.9,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(2840.9,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-57-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-57-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-57-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-57-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3047.7,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-57-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3769.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-57-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-57-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5012.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-57-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5401.9,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-57-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5845.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-57-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-1533)\"><g data-mml-node=\"mtd\" transform=\"translate(2840.9,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(2840.9,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-57-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-57-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1722.6,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-57-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2515.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-57-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3516,0)\"><use data-c=\"31\" xlink:href=\"#MJX-57-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4016,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-57-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-57-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(5077,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-57-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(839.5,413) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-57-TEX-N-394\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-57-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6555.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-57-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6944.5,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-57-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7388.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-57-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7777.5,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-57-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, in order to construct <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.427ex\" height=\"2.49ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 2840.9 1100.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path id=\"MJX-1038-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1038-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1038-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1038-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1038-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1038-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1038-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1038-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1038-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1491.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1038-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1880.9,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1038-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2451.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1038-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n^X(\\sigma)<\/script>, we only need to construct <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.11ex\" height=\"2.543ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 2700.5 1124.1\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path id=\"MJX-1039-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1039-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1039-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1039-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1039-TEX-I-1D6FF\" d=\"M195 609Q195 656 227 686T302 717Q319 716 351 709T407 697T433 690Q451 682 451 662Q451 644 438 628T403 612Q382 612 348 641T288 671T249 657T235 628Q235 584 334 463Q401 379 401 292Q401 169 340 80T205 -10H198Q127 -10 83 36T36 153Q36 286 151 382Q191 413 252 434Q252 435 245 449T230 481T214 521T201 566T195 609ZM112 130Q112 83 136 55T204 27Q233 27 256 51T291 111T309 178T316 232Q316 267 309 298T295 344T269 400L259 396Q215 381 183 342T137 256T118 179T112 130Z\"><\/path><path id=\"MJX-1039-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1039-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"394\" xlink:href=\"#MJX-1039-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1039-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1478.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1039-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1867.5,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1039-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2311.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1039-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n^\\Delta(\\delta)<\/script>.<\/p>\n<p>Next, let&#39;s construct <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.699ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 751 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1040-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1040-TEX-I-1D443\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P<\/script> by induction on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>.<\/p>\n<ul>\n<li><p>Base step for induction (<mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.692ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 748\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.186ex;\"><defs><path id=\"MJX-1042-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1042-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1042-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1042-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1042-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1042-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n=0<\/script>\u200b):<\/p>\n<p>We have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.833ex\" height=\"2.697ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 3462.2 1191.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.783ex;\"><defs><path id=\"MJX-1043-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1043-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1043-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1043-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1043-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1043-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1043-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1043-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-287.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1043-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1043-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1906.5,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1043-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2962.2,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1043-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_{-1}^X=0<\/script> for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.619ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6461.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1044-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1044-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1044-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 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732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1044-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1044-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-1044-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-1044-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(777.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1044-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2055.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1044-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1044-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3105.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1044-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3494.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1044-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4568.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1044-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5568.6,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1044-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6072.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1044-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">0\\to S_0(X\\times I)<\/script> only has one homomorphism.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.154ex\" height=\"1.912ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 5372.2 844.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1045-TEX-I-1D6FF\" d=\"M195 609Q195 656 227 686T302 717Q319 716 351 709T407 697T433 690Q451 682 451 662Q451 644 438 628T403 612Q382 612 348 641T288 671T249 657T235 628Q235 584 334 463Q401 379 401 292Q401 169 340 80T205 -10H198Q127 -10 83 36T36 153Q36 286 151 382Q191 413 252 434Q252 435 245 449T230 481T214 521T201 566T195 609ZM112 130Q112 83 136 55T204 27Q233 27 256 51T291 111T309 178T316 232Q316 267 309 298T295 344T269 400L259 396Q215 381 183 342T137 256T118 179T112 130Z\"><\/path><path id=\"MJX-1045-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1045-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1045-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1045-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1045-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(721.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1045-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1277.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1045-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1045-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2824.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1045-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(4102.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1045-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1045-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\delta:\\Delta^0\\to \\Delta^0<\/script>\u200b be the identity map.<\/p>\n<p>Define <\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n371\" cid=\"n371\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"23.406ex\" height=\"5.615ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1490.9 10345.4 2481.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -2.242ex;\"><defs><path id=\"MJX-58-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-58-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-58-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 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708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><path id=\"MJX-58-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,571.6)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use 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transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-58-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3680.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-58-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4069.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-58-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4513.8,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-58-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4874.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-58-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5263.8,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-58-TEX-N-2C\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>and, for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.557ex\" role=\"img\" focusable=\"false\" 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data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-59-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-59-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2251.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-59-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2640.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-59-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3085.2,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-59-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3446.2,0)\"><use data-c=\"29\" xlink:href=\"#MJX-59-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3835.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-59-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>By extending <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.375ex\" height=\"2.601ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 1491.9 1149.4\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.687ex;\"><defs><path id=\"MJX-1048-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1048-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1048-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1048-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1048-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-287.9) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1048-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_0^X<\/script> by linearity, we get homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.811ex\" height=\"2.601ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 10966.6 1149.4\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.687ex;\"><defs><path id=\"MJX-1049-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1049-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1049-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1049-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1049-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-1049-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1049-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1049-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1049-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1049-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1049-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1049-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1049-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-287.9) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1049-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1769.7,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1049-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2325.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1049-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1049-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3375,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1049-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3764,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1049-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4616,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1049-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5282.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1049-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6560.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1049-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1049-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7610.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1049-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7999.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1049-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9073.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1049-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(10073.6,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1049-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10577.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1049-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_0^X:S_0(X)\\to S_1(X\\times I)<\/script>.<\/p>\n<p>Then we should verify the inductive hypothesis.<\/p>\n<ul>\n<li><p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.557ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 688\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.05ex;\"><defs><path id=\"MJX-1050-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-1050-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">0<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n379\" cid=\"n379\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32.412ex\" height=\"13.215ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3170.6 14326.1 5841.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -6.042ex;\"><defs><path id=\"MJX-60-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 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transform=\"translate(2293.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-60-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2682.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-60-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-60-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3585.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-60-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3974.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-60-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4418.8,0)\"><use data-c=\"31\" xlink:href=\"#MJX-60-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4918.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-60-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5307.8,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-60-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Consequently,<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n381\" cid=\"n381\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"36.662ex\" height=\"2.921ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -896 16204.4 1290.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.893ex;\"><defs><path id=\"MJX-61-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-61-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-61-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 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transform=\"translate(6288.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-61-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6677.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-61-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7066.3,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-61-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7637.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-61-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8304.1,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-61-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9359.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-61-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(9748.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-61-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-61-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(616,-257.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-61-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(500,0)\"><use data-c=\"23\" xlink:href=\"#MJX-61-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11579.6,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-61-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(12579.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D706\" xlink:href=\"#MJX-61-TEX-I-1D706\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(616,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-61-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(616,-257.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-61-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(500,0)\"><use data-c=\"23\" xlink:href=\"#MJX-61-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14188.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-61-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(14577.4,0)\"><use data-c=\"28\" xlink:href=\"#MJX-61-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(14966.4,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-61-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(15537.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-61-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(15926.4,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-61-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>And by the universal property of the abelian groups, we know <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1072-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-1072-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1072-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1072-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(*)<\/script> is true.<\/p>\n<\/li>\n<li><p>(Naturality of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.6ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1149.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1075-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1075-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1075-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1075-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n<\/script>\u200b)<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.303ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4554.1 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1074-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1074-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1074-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1074-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1074-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1074-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2513.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1074-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3791.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1074-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:X\\to Y<\/script> be a continuous map. Then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n386\" cid=\"n386\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40.867ex\" height=\"12.793ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3077.3 18063.3 5654.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -5.831ex;\"><defs><path id=\"MJX-62-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-62-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-62-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-62-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-62-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-62-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-62-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 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47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-62-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-62-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-62-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-62-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-62-TEX-I-1D6FF\" d=\"M195 609Q195 656 227 686T302 717Q319 716 351 709T407 697T433 690Q451 682 451 662Q451 644 438 628T403 612Q382 612 348 641T288 671T249 657T235 628Q235 584 334 463Q401 379 401 292Q401 169 340 80T205 -10H198Q127 -10 83 36T36 153Q36 286 151 382Q191 413 252 434Q252 435 245 449T230 481T214 521T201 566T195 609ZM112 130Q112 83 136 55T204 27Q233 27 256 51T291 111T309 178T316 232Q316 267 309 298T295 344T269 400L259 396Q215 381 183 342T137 256T118 179T112 130Z\"><\/path><path id=\"MJX-62-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-62-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><path id=\"MJX-62-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,2158)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-62-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1161.2,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-62-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2161.4,0)\"><use data-c=\"31\" xlink:href=\"#MJX-62-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2661.4,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) 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data-mml-node=\"mn\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-62-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10278,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(10667,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-62-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11111,0)\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,651.5)\"><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-62-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1722.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2111.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-62-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2883.8,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-62-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3606,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-62-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4177,0)\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4788.2,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-62-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(5788.4,0)\"><use data-c=\"31\" xlink:href=\"#MJX-62-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6288.4,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-62-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(7349.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-62-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"394\" xlink:href=\"#MJX-62-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-62-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8827.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9216.9,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-62-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9660.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-831.6)\"><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-62-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-62-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-62-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-62-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2762.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3151.5,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-62-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3923.8,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-62-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4646,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-62-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5217,0)\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2290.1)\"><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-62-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-62-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-62-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-62-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2762.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-62-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-62-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3924.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-62-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4313.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-62-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4884.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-62-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5273.5,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-62-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Similarly, by the universal property, we know <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.44ex\" height=\"1.92ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1078.6 848.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1055-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1055-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1055-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(675,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1055-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_0<\/script> is a natural transformation. <\/p>\n<\/li>\n\n<\/ul>\n<\/li>\n<li><p>Assume that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.597ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 706\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-1085-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1085-TEX-N-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path id=\"MJX-1085-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1085-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3E\" xlink:href=\"#MJX-1085-TEX-N-3E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1085-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n>0<\/script>\u200b\u200b.<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.474ex\" height=\"1.647ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -717 5513.6 728\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1057-TEX-I-1D6FF\" d=\"M195 609Q195 656 227 686T302 717Q319 716 351 709T407 697T433 690Q451 682 451 662Q451 644 438 628T403 612Q382 612 348 641T288 671T249 657T235 628Q235 584 334 463Q401 379 401 292Q401 169 340 80T205 -10H198Q127 -10 83 36T36 153Q36 286 151 382Q191 413 252 434Q252 435 245 449T230 481T214 521T201 566T195 609ZM112 130Q112 83 136 55T204 27Q233 27 256 51T291 111T309 178T316 232Q316 267 309 298T295 344T269 400L259 396Q215 381 183 342T137 256T118 179T112 130Z\"><\/path><path id=\"MJX-1057-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1057-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1057-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1057-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1057-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(721.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1057-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1277.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1057-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1057-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2895.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1057-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(4173.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1057-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1057-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\delta:\\Delta^n\\to\\Delta^n<\/script>\u200b be the identity map.<\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1072-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-1072-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1072-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1072-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(*)<\/script> is true, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n392\" cid=\"n392\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"38.066ex\" height=\"2.973ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -919.3 16825 1314.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.893ex;\"><defs><path id=\"MJX-63-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 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transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-63-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-63-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(14759,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-63-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(15325,0)\"><use data-c=\"28\" xlink:href=\"#MJX-63-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(15714,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-63-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16158,0)\"><use data-c=\"29\" xlink:href=\"#MJX-63-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16547,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-63-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Therefore, we need to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg 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transform=\"translate(5050.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1065-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6051,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1065-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"394\" xlink:href=\"#MJX-1065-TEX-N-394\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-287.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1065-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1065-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1065-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(8104,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-1065-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8670,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1065-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9059,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1065-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9448,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1065-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9892,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1065-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10558.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1065-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(11503.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1065-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1065-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12769.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1065-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(13158.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1065-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1065-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14721.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1065-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(15721.5,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1065-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16225.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1065-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(\\lambda_{0\\#}^\\Delta-\\lambda_{1\\#}^\\Delta-P_{n-1}^\\Delta\\partial)(\\delta)\\in B_n(\\Delta^n\\times I)<\/script>.<\/p>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.938ex\" height=\"1.62ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -716 3066.7 716\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1060-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1060-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1060-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1060-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1060-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1060-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1562.5,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1060-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2562.7,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1060-TEX-I-1D43C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^n\\times I<\/script> is a bounded convex subset of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"4.826ex\" height=\"1.887ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 2132.9 833.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1061-TEX-D-211D\" d=\"M17 665Q17 672 28 683H221Q415 681 439 677Q461 673 481 667T516 654T544 639T566 623T584 607T597 592T607 578T614 565T618 554L621 548Q626 530 626 497Q626 447 613 419Q578 348 473 326L455 321Q462 310 473 292T517 226T578 141T637 72T686 35Q705 30 705 16Q705 7 693 -1H510Q503 6 404 159L306 310H268V183Q270 67 271 59Q274 42 291 38Q295 37 319 35Q344 35 353 28Q362 17 353 3L346 -1H28Q16 5 16 16Q16 35 55 35Q96 38 101 52Q106 60 106 341T101 632Q95 645 55 648Q17 648 17 665ZM241 35Q238 42 237 45T235 78T233 163T233 337V621L237 635L244 648H133Q136 641 137 638T139 603T141 517T141 341Q141 131 140 89T134 37Q133 36 133 35H241ZM457 496Q457 540 449 570T425 615T400 634T377 643Q374 643 339 648Q300 648 281 635Q271 628 270 610T268 481V346H284Q327 346 375 352Q421 364 439 392T457 496ZM492 537T492 496T488 427T478 389T469 371T464 361Q464 360 465 360Q469 360 497 370Q593 400 593 495Q593 592 477 630L457 637L461 626Q474 611 488 561Q492 537 492 496ZM464 243Q411 317 410 317Q404 317 401 315Q384 315 370 312H346L526 35H619L606 50Q553 109 464 243Z\"><\/path><path id=\"MJX-1061-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1061-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1061-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"211D\" xlink:href=\"#MJX-1061-TEX-D-211D\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(755,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1061-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1061-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"32\" xlink:href=\"#MJX-1061-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbb R^{n+2}<\/script>, by lemma 3.4, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15.874ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7016.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1062-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1062-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1062-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1062-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1062-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1062-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-1062-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1062-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1062-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1062-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1062-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1062-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1727.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1062-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1062-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3289.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1062-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4290,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1062-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4794,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1062-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5460.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1062-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(6516.5,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1062-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(\\Delta^n\\times I)=0<\/script>; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"25.972ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 11479.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1063-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1063-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1063-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 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458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1063-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1063-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1063-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1655.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1063-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1063-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3217.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1063-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4218,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1063-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4722,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1063-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5388.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1063-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6444.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-1063-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1063-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7634.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1063-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(8023.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1063-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1063-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9586.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1063-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(10586.5,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1063-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11090.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1063-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_n(\\Delta^n\\times I)=Z_n(\\Delta^n\\times I)<\/script>.<\/p>\n<p>Consequently, we only need to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"37.417ex\" height=\"2.973ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 16538.5 1314.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.007ex;\"><defs><path id=\"MJX-1064-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1064-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path id=\"MJX-1064-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1064-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1064-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 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48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1064-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 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xlink:href=\"#MJX-1064-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"394\" xlink:href=\"#MJX-1064-TEX-N-394\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-287.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1064-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1064-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1064-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(8104,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-1064-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8670,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1064-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9059,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1064-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9448,0)\"><use data-c=\"1D6FF\" xlink:href=\"#MJX-1064-TEX-I-1D6FF\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9892,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1064-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10558.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1064-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(11503.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D44D\" xlink:href=\"#MJX-1064-TEX-I-1D44D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(716,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1064-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12693.8,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1064-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(13082.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1064-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1064-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(14645.3,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1064-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(15645.5,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1064-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(16149.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1064-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(\\lambda_{0\\#}^\\Delta-\\lambda_{1\\#}^\\Delta-P_{n-1}^\\Delta\\partial)(\\delta)\\in Z_n(\\Delta^n\\times I)<\/script>.<\/p>\n<p>Since<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n397\" cid=\"n397\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" 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data-mml-node=\"TeXAtom\" transform=\"translate(675,-247) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-64-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-64-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-64-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(16419,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-64-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(16985,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-64-TEX-I-1D715\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-3228.4)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mo\"><use data-c=\"3D\" xlink:href=\"#MJX-64-TEX-N-3D\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(778,0)\"><g data-mml-node=\"mn\"><use data-c=\"30\" xlink:href=\"#MJX-64-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-64-TEX-N-2C\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"37.589ex\" height=\"2.973ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 16614.5 1314.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.007ex;\"><defs><path id=\"MJX-1065-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1065-TEX-I-1D706\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 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xlink:href=\"#MJX-1065-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(\\lambda_{0\\#}^\\Delta-\\lambda_{1\\#}^\\Delta-P_{n-1}^\\Delta\\partial)(\\delta)\\in B_n(\\Delta^n\\times I)<\/script>; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.626ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9116.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1066-TEX-N-2203\" d=\"M56 661T56 674T70 694H487Q497 686 500 679V15Q497 10 487 1L279 0H70Q56 7 56 20T70 40H460V327H84Q70 334 70 347T84 367H460V654H70Q56 661 56 674Z\"><\/path><path id=\"MJX-1066-TEX-I-1D6FD\" d=\"M29 -194Q23 -188 23 -186Q23 -183 102 134T186 465Q208 533 243 584T309 658Q365 705 429 705H431Q493 705 533 667T573 570Q573 465 469 396L482 383Q533 332 533 252Q533 139 448 65T257 -10Q227 -10 203 -2T165 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data-mml-node=\"mo\" transform=\"translate(5779.4,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1066-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6168.4,0)\"><use data-c=\"394\" xlink:href=\"#MJX-1066-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7223.7,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1066-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8223.9,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1066-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8727.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1066-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\exists \\beta_{n+1}\\in S_{n+1}(\\Delta\\times I)<\/script>, such that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32.031ex\" height=\"2.973ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -869.3 14157.5 1314.2\" 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data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1067-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"394\" xlink:href=\"#MJX-1067-TEX-N-394\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-287.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1067-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1067-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1067-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(11980.5,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-1067-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(12546.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1067-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" 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xlink:href=\"#MJX-66-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2515.8,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-66-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3516,0)\"><use data-c=\"31\" xlink:href=\"#MJX-66-TEX-N-31\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4016,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-66-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(422,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-66-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(5077,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D6FD\" xlink:href=\"#MJX-66-TEX-I-1D6FD\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(599,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-66-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-66-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-66-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7054,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-66-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>By extending <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.375ex\" height=\"2.49ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 1491.9 1100.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path id=\"MJX-1068-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1068-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1068-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1068-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1068-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1068-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n^X<\/script> by linearity, we get homomorphisms <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"27.176ex\" height=\"2.49ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 12011.7 1100.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.576ex;\"><defs><path 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485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1069-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1069-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1069-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-1069-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1069-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1069-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1069-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1069-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1069-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-1069-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1069-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1069-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1069-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1769.7,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1069-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2325.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1069-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(646,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1069-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3445.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1069-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3834.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1069-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4686.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1069-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5353.5,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1069-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6631.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1069-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(646,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1069-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1069-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1069-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8655.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1069-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9044.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1069-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10118.4,0)\"><use data-c=\"D7\" xlink:href=\"#MJX-1069-TEX-N-D7\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(11118.7,0)\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1069-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11622.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1069-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n^X:S_n(X)\\to S_{n+1}(X\\times I)<\/script>.<\/p>\n<p>Next, we need to verify inductive hypothesis.<\/p>\n<ul>\n<li><p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.357ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 600 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1070-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1070-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>\u200b, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n408\" cid=\"n408\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"42.455ex\" height=\"12.953ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -3112.7 18764.9 5725.4\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -5.911ex;\"><defs><path id=\"MJX-67-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-67-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-67-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 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26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-67-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-67-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 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scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-67-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(500,0)\"><use data-c=\"23\" xlink:href=\"#MJX-67-TEX-N-23\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6384.4,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-67-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(7384.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-67-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-67-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(675,-247) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-67-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(600,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-67-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1378,0)\"><use data-c=\"31\" xlink:href=\"#MJX-67-TEX-N-31\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(9437.5,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-67-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10003.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-67-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10392.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-67-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(10781.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-67-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11352.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-67-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>And by the universal property of the abelian groups, we know <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.891ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1278 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1072-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1072-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1072-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-1072-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(389,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1072-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(889,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1072-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">(*)<\/script> is true.<\/p>\n<\/li>\n<li><p>(Naturality of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.6ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1149.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1075-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1075-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1075-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1075-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n<\/script>)<\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.303ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 4554.1 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1074-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1074-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1074-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1074-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1074-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1074-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1383.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1074-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2513.3,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1074-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3791.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1074-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f:X\\to Y<\/script> be a continuous map. Then we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n413\" cid=\"n413\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"39.23ex\" height=\"12.34ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -2977.1 17339.8 5454.2\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -5.604ex;\"><defs><path id=\"MJX-68-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-68-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-68-TEX-N-D7\" d=\"M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587 475T609 491Q630 491 630 471Q630 464 620 453T522 355L418 250L522 145Q606 61 618 48T630 29Z\"><\/path><path id=\"MJX-68-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-68-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-68-TEX-N-23\" d=\"M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 367H543L585 524Q626 679 630 685Q636 694 646 694Q653 694 659 689T665 678Q665 668 626 522Q585 374 585 369L584 367H762Q777 359 777 347Q777 334 767 331T722 327H667H572L552 251L531 174Q531 173 647 173H720Q756 173 766 170T777 153T762 133H519L477 -24Q436 -179 432 -185Q426 -194 416 -194Q409 -194 403 -189T397 -177Q397 -167 436 -21Q477 125 477 131L478 133H289L247 -24Q206 -179 202 -185Q196 -194 186 -194Q179 -194 173 -189T167 -177Q167 -167 206 -21Q247 125 247 131L248 133H70Q56 140 56 153Q56 168 72 173H260L280 249L301 326Q301 327 186 327H72Q56 332 56 347ZM531 326Q531 327 437 327H342L322 251L301 174Q301 173 395 173H490L510 249L531 326Z\"><\/path><path id=\"MJX-68-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-68-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-68-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-68-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-68-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-68-TEX-I-1D6FD\" d=\"M29 -194Q23 -188 23 -186Q23 -183 102 134T186 465Q208 533 243 584T309 658Q365 705 429 705H431Q493 705 533 667T573 570Q573 465 469 396L482 383Q533 332 533 252Q533 139 448 65T257 -10Q227 -10 203 -2T165 17T143 40T131 59T126 65L62 -188Q60 -194 42 -194H29ZM353 431Q392 431 427 419L432 422Q436 426 439 429T449 439T461 453T472 471T484 495T493 524T501 560Q503 569 503 593Q503 611 502 616Q487 667 426 667Q384 667 347 643T286 582T247 514T224 455Q219 439 186 308T152 168Q151 163 151 147Q151 99 173 68Q204 26 260 26Q302 26 349 51T425 137Q441 171 449 214T457 279Q457 337 422 372Q380 358 347 358H337Q258 358 258 389Q258 396 261 403Q275 431 353 431Z\"><\/path><path id=\"MJX-68-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-68-TEX-N-2218\" d=\"M55 251Q55 328 112 386T249 444T386 388T444 249Q444 171 388 113T250 55Q170 55 113 112T55 251ZM245 403Q188 403 142 361T96 250Q96 183 141 140T250 96Q284 96 313 109T354 135T375 160Q403 197 403 250Q403 313 360 358T245 403Z\"><\/path><path id=\"MJX-68-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><path id=\"MJX-68-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mtable\"><g data-mml-node=\"mtr\" transform=\"translate(0,2081.1)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mo\"><use data-c=\"28\" xlink:href=\"#MJX-68-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(389,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-68-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" 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data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-68-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-68-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-68-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-68-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2762.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-68-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3151.5,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-68-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3923.8,0)\"><use data-c=\"2218\" xlink:href=\"#MJX-68-TEX-N-2218\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4646,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-68-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5217,0)\"><use data-c=\"29\" xlink:href=\"#MJX-68-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-2189.9)\"><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(6563.4,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-68-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(1333.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-68-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(839.5,413) scale(0.707)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-68-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-247) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-68-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(2762.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-68-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"23\" xlink:href=\"#MJX-68-TEX-N-23\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3924.5,0)\"><use data-c=\"28\" xlink:href=\"#MJX-68-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4313.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-68-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4884.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-68-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5273.5,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-68-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Similarly, by the universal property, we know <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.6ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1149.3 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1075-TEX-I-1D443\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path id=\"MJX-1075-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D443\" xlink:href=\"#MJX-1075-TEX-I-1D443\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(675,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1075-TEX-I-1D45B\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">P_n<\/script> is a natural transformation. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/li>\n\n<\/ul>\n<\/li>\n\n<\/ul>\n<\/blockquote>\n<p>Therefore, we can also see <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.868ex\" height=\"1.885ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1267.6 833\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1197-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1197-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1197-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1197-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1<\/script> as a functor from <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.002ex\" height=\"2.009ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 2653 888\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1078-TEX-B-1D421\" d=\"M40 686L131 690Q222 694 223 694H229V533L230 372L238 381Q248 394 264 407T317 435T398 450Q428 450 448 447T491 434T529 402T551 346Q553 335 554 198V62H623V0H614Q596 3 489 3Q374 3 365 0H356V62H425V194V275Q425 348 416 373T371 399Q326 399 288 370T238 290Q236 281 235 171V62H304V0H295Q277 3 171 3Q64 3 46 0H37V62H106V332Q106 387 106 453T107 534Q107 593 105 605T91 620Q77 624 50 624H37V686H40Z\"><\/path><path id=\"MJX-1078-TEX-B-1D413\" d=\"M41 425Q41 426 51 545T62 669V675H737V669Q738 665 748 546T758 425V419H696V425Q687 517 669 555T595 607Q578 612 522 613H478V62H631V0H615Q585 3 399 3Q214 3 184 0H168V62H321V613H277H263Q164 613 134 561Q113 527 103 425V419H41V425Z\"><\/path><path id=\"MJX-1078-TEX-B-1D428\" d=\"M287 -5Q228 -5 182 10T109 48T63 102T39 161T32 219Q32 272 50 314T94 382T154 423T214 446T265 452H279Q319 452 326 451Q428 439 485 376T542 221Q542 156 514 108T442 33Q384 -5 287 -5ZM399 230V250Q399 280 398 298T391 338T372 372T338 392T282 401Q241 401 212 380Q190 363 183 334T175 230Q175 202 175 189T177 153T183 118T195 91T215 68T245 56T287 50Q348 50 374 84Q388 101 393 132T399 230Z\"><\/path><path id=\"MJX-1078-TEX-B-1D429\" d=\"M32 442L123 446Q214 450 215 450H221V409Q222 409 229 413T251 423T284 436T328 446T382 450Q480 450 540 388T600 223Q600 128 539 61T361 -6H354Q292 -6 236 28L227 34V-132H296V-194H287Q269 -191 163 -191Q56 -191 38 -194H29V-132H98V113V284Q98 330 97 348T93 370T83 376Q69 380 42 380H29V442H32ZM457 224Q457 303 427 349T350 395Q282 395 235 352L227 345V104L233 97Q274 45 337 45Q383 45 420 86T457 224Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D421\" xlink:href=\"#MJX-1078-TEX-B-1D421\"><\/use><use data-c=\"1D413\" xlink:href=\"#MJX-1078-TEX-B-1D413\" transform=\"translate(639,0)\"><\/use><use data-c=\"1D428\" xlink:href=\"#MJX-1078-TEX-B-1D428\" transform=\"translate(1439,0)\"><\/use><use data-c=\"1D429\" xlink:href=\"#MJX-1078-TEX-B-1D429\" transform=\"translate(2014,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbf{hTop}<\/script> to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"3.412ex\" height=\"1.593ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -698 1508 704\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.014ex;\"><defs><path id=\"MJX-1079-TEX-B-1D400\" d=\"M296 0Q278 3 164 3Q58 3 49 0H40V62H92Q144 62 144 64Q388 682 397 689Q403 698 434 698Q463 698 471 689Q475 686 538 530T663 218L724 64Q724 62 776 62H828V0H817Q796 3 658 3Q509 3 485 0H472V62H517Q561 62 561 63L517 175H262L240 120Q218 65 217 64Q217 62 261 62H306V0H296ZM390 237L492 238L440 365Q390 491 388 491Q287 239 287 237H390Z\"><\/path><path id=\"MJX-1079-TEX-B-1D41B\" d=\"M32 686L123 690Q214 694 215 694H221V409Q289 450 378 450Q479 450 539 387T600 221Q600 122 535 58T358 -6H355Q272 -6 203 53L160 1L129 0H98V301Q98 362 98 435T99 525Q99 591 97 604T83 620Q69 624 42 624H29V686H32ZM227 105L232 99Q237 93 242 87T258 73T280 59T306 49T339 45Q380 45 411 66T451 131Q457 160 457 230Q457 264 456 284T448 329T430 367T396 389T343 398Q282 398 235 355L227 348V105Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D400\" xlink:href=\"#MJX-1079-TEX-B-1D400\"><\/use><use data-c=\"1D41B\" xlink:href=\"#MJX-1079-TEX-B-1D41B\" transform=\"translate(869,0)\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\mathbf{Ab}<\/script>.<\/p>\n<blockquote><p><strong>3.11 Corollary.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.726ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 763 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1081-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1081-TEX-I-1D44C\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">Y<\/script> have the same homotopic type, then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.247ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7181.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1082-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1082-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1082-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1082-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1082-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1082-TEX-N-2245\" d=\"M55 388Q55 463 101 526T222 589Q260 589 296 571T362 526T421 474T484 430T554 411Q616 411 655 458T694 560Q694 572 698 580T708 589Q722 589 722 556Q722 482 677 419T562 356H554Q517 356 481 374T414 418T355 471T292 515T223 533Q179 533 145 508Q109 479 96 440T80 378T69 355Q55 355 55 388ZM56 236Q56 249 70 256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><path id=\"MJX-1082-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1082-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1082-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1082-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1082-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1082-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-1082-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4301.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1082-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1082-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5640.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1082-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6029.1,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1082-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6792.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1082-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)\\cong H_n(Y)<\/script>.<\/p>\n<\/blockquote>\n<blockquote><p><strong>3.12 Corollary.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is contractible, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.864ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4801.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1084-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1084-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1084-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1084-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1084-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1084-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1084-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1084-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1084-TEX-I-1D45B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1338.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1084-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1727.3,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1084-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2579.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1084-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3246,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1084-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4301.8,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1084-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_n(X)=0<\/script> for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.506ex\" height=\"1.597ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 2433.6 706\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-1085-TEX-I-1D45B\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1085-TEX-N-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path id=\"MJX-1085-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D45B\" xlink:href=\"#MJX-1085-TEX-I-1D45B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(877.8,0)\"><use data-c=\"3E\" xlink:href=\"#MJX-1085-TEX-N-3E\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1933.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1085-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">n>0<\/script>, and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.082ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4898.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1086-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1086-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1086-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1086-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1086-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1086-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1086-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1086-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1086-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1086-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1086-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1086-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1086-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(4231.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-1086-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_0(X)=\\mathbb Z<\/script>.<\/p>\n<\/blockquote>\n<h2 id='4-hurewicz-theorem'>4. Hurewicz Theorem<\/h2>\n<p>In this section, let&#39;s talk about the relationship between <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"1.314ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 1006.6 581\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1196-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1196-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1196-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1196-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\pi_1<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.868ex\" height=\"1.885ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1267.6 833\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1197-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1197-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1197-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1197-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1<\/script>. Additionally, <strong>all the topological spaces in this section are path-connected<\/strong>, and we always choose a base point <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.975ex\" height=\"1.92ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 3083.1 848.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1089-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1089-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1089-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1089-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1089-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1089-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1286.3,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1089-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2231.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1089-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0\\in X<\/script>.<\/p>\n<p>We will denote the abelianized fundamental group of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> at <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.282ex\" height=\"1.375ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1008.6 607.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1201-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1201-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1201-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1201-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0<\/script> as <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"2.036ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1006.6 900\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1156-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 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xlink:href=\"#MJX-1156-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1156-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1156-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\tilde\\pi_1<\/script>; that is <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.931ex\" height=\"2.3ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 11019.7 1016.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.583ex;\"><defs><path id=\"MJX-1093-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 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transform=\"translate(1284.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1093-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2340.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1093-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1093-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3346.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1093-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3735.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1093-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4587.7,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1093-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5032.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1093-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1093-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6040.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1093-TEX-N-29\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(6429.9,0)\"><g data-mml-node=\"mo\"><use data-c=\"2F\" xlink:href=\"#MJX-1093-TEX-N-2F\"><\/use><\/g><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6929.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1093-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(603,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-1093-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-257.5) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1093-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7936.4,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1093-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(8325.4,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1093-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9177.4,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1093-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(9622.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1093-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1093-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10630.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1093-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\tilde \\pi_1=\\pi_1(X,x_0)\/\\pi_1'(X,x_0)<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.253ex\" height=\"2.3ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -759 4089.8 1016.5\" 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383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1094-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1094-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 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725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msubsup\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1094-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(603,363) scale(0.707)\"><use data-c=\"2032\" xlink:href=\"#MJX-1094-TEX-V-2032\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-257.5) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1094-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1006.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1094-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1395.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1094-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2247.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1094-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2692.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1094-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1094-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3700.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1094-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\pi_1'(X,x_0)<\/script> is the commutator subgroup of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.253ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4089.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1095-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1095-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1095-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1095-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1095-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1095-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1095-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1095-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1095-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1095-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1006.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1095-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1395.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1095-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2247.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1095-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2692.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1095-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1095-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3700.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1095-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\pi_1(X,x_0)<\/script>.<\/p>\n<p>We will use <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.502ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1106 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1098-TEX-N-5B\" d=\"M118 -250V750H255V710H158V-210H255V-250H118Z\"><\/path><path id=\"MJX-1098-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1098-TEX-N-5D\" d=\"M22 710V750H159V-250H22V-210H119V710H22Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"5B\" xlink:href=\"#MJX-1098-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(278,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1098-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(828,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-1098-TEX-N-5D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">[f]<\/script> stands for a homotopy class; <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.776ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1022 550 1227\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1097-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1097-TEX-N-2013\" d=\"M0 248V285H499V248H0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1097-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(25,637)\"><use data-c=\"2013\" xlink:href=\"#MJX-1097-TEX-N-2013\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\overline f<\/script> stands for the coset of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.502ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1106 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1098-TEX-N-5B\" d=\"M118 -250V750H255V710H158V-210H255V-250H118Z\"><\/path><path id=\"MJX-1098-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1098-TEX-N-5D\" d=\"M22 710V750H159V-250H22V-210H119V710H22Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"5B\" xlink:href=\"#MJX-1098-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(278,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1098-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(828,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-1098-TEX-N-5D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">[f]<\/script> in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"2.036ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1006.6 900\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1156-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1156-TEX-N-7E\" d=\"M179 251Q164 251 151 245T131 234T111 215L97 227L83 238Q83 239 95 253T121 283T142 304Q165 318 187 318T253 300T320 282Q335 282 348 288T368 299T388 318L402 306L416 295Q375 236 344 222Q330 215 313 215Q292 215 248 233T179 251Z\"><\/path><path id=\"MJX-1156-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1156-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1156-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1156-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\tilde\\pi_1<\/script>; and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.341ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 2360.6 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1100-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1100-TEX-N-2243\" d=\"M55 283Q55 356 103 409T217 463Q262 463 297 447T395 382Q431 355 446 344T493 320T554 307H558Q613 307 652 344T694 433Q694 464 708 464T722 432Q722 356 673 304T564 251H554Q510 251 465 275T387 329T310 382T223 407H219Q164 407 122 367Q91 333 85 295T76 253T69 250Q55 250 55 283ZM56 56Q56 71 72 76H706Q722 70 722 56Q722 44 707 36H70Q56 43 56 56Z\"><\/path><path id=\"MJX-1100-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1100-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"2243\" xlink:href=\"#MJX-1100-TEX-N-2243\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1100-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f\\simeq g<\/script> stands for &quot;<mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> is homotopic to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script>&quot;, while &quot;<mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.341ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 2360.6 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1130-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1130-TEX-N-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path id=\"MJX-1130-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1130-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"223C\" xlink:href=\"#MJX-1130-TEX-N-223C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1130-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f\\sim g<\/script> stands for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> is homologous to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script>\u200b&quot;.<\/p>\n<blockquote><p><strong>4.1 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script> are paths in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> such that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.123ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4916.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1109-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1109-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1109-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1109-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1109-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1109-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1109-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1109-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(550,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1109-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(939,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1109-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1439,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1109-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2105.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1109-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3161.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1109-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3638.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1109-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4027.6,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1109-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4527.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1109-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f(1)=g(0)<\/script> then the <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1184-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1184-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1<\/script>-chain <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12.315ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 5443.3 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1111-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1111-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1111-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1111-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1111-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(772.2,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1111-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1494.4,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1111-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2193.7,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1111-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3193.9,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1111-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3966.1,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1111-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4966.3,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1111-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f*g-f-g<\/script> is a boundary.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Define a continuous map <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.497ex\" height=\"1.912ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 5081.7 844.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1112-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1112-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1112-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1112-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path id=\"MJX-1112-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1112-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1112-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(848.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1112-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1404.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1112-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-1112-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2951.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1112-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4229.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1112-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma:\\Delta^2\\to X<\/script>\u200b as indicated by the following picture.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/fstarg-f-g.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/fstarg-f-g.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=30%\/><\/div><\/p>\n<p>In more detail, first define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> on <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.872ex\" height=\"1.887ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 1269.6 833.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1116-TEX-N-394\" d=\"M51 0Q46 4 46 7Q46 9 215 357T388 709Q391 716 416 716Q439 716 444 709Q447 705 616 357T786 7Q786 4 781 0H51ZM507 344L384 596L137 92L383 91H630Q630 93 507 344Z\"><\/path><path id=\"MJX-1116-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1116-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-1116-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^2<\/script>:<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n433\" cid=\"n433\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.169ex\" height=\"8.145ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -2050 10682.8 3600\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -3.507ex;\"><defs><path id=\"MJX-69-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-69-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-69-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-69-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-69-TEX-I-1D461\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path id=\"MJX-69-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-69-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-69-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-69-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-69-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-69-TEX-N-3B\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 85 94 103T137 121Q202 121 202 8Q202 -44 183 -94T144 -169T118 -194Q115 -194 106 -186T95 -174Q94 -171 107 -155T137 -107T160 -38Q161 -32 162 -22T165 -4T165 4Q165 5 161 4T142 0Q110 0 94 18T78 60Z\"><\/path><path id=\"MJX-69-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 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transform=\"translate(5182.8,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-69-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1333.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-69-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1722.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-69-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2494.8,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-69-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3217,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-69-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3694,0)\"><use data-c=\"29\" xlink:href=\"#MJX-69-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4083,0)\"><use data-c=\"28\" xlink:href=\"#MJX-69-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4472,0)\"><use data-c=\"1D461\" xlink:href=\"#MJX-69-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4833,0)\"><use data-c=\"29\" xlink:href=\"#MJX-69-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5222,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-69-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>Now define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 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d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"394\" xlink:href=\"#MJX-1116-TEX-N-394\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(866,363) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-1116-TEX-N-32\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\Delta^2<\/script> by setting it constant on the line segment with endpoints 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xlink:href=\"#MJX-1120-TEX-N-29\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(13347.3,0)\"><g data-mml-node=\"mo\"><use data-c=\"2F\" xlink:href=\"#MJX-1120-TEX-N-2F\"><\/use><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(13847.3,0)\"><use data-c=\"32\" xlink:href=\"#MJX-1120-TEX-N-32\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(14347.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1120-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">d=d(t)=((1-t)\/2,0,(1+t)\/2)<\/script>.<\/p>\n<p>Then we can find that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"17.905ex\" height=\"2.081ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 7913.9 920\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1121-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-1121-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1121-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1121-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1121-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1121-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1121-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1121-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-1121-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1121-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1414.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1121-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2470.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1121-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3242.8,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1121-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4243,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1121-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4942.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1121-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5942.4,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1121-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6714.7,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1121-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7436.9,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1121-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\sigma=f+g-f*g<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>4.2 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> is a constant, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> is a boundary.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>By lemma 3.1, we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18.667ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 8250.9 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1125-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1125-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1125-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1125-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1125-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(772.2,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1125-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1494.4,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1125-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2266.7,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1125-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3266.9,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1125-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4039.1,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1125-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5039.3,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1125-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5867.1,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1125-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6922.9,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1125-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7700.9,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1125-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f*f-f-f=-f<\/script> is a boundary. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>4.3 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.079ex\" height=\"1.464ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 477 647\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1128-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D454\" xlink:href=\"#MJX-1128-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">g<\/script> are paths with <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.132ex\" height=\"2.744ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1008 4478.6 1213\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1129-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1129-TEX-N-2243\" d=\"M55 283Q55 356 103 409T217 463Q262 463 297 447T395 382Q431 355 446 344T493 320T554 307H558Q613 307 652 344T694 433Q694 464 708 464T722 432Q722 356 673 304T564 251H554Q510 251 465 275T387 329T310 382T223 407H219Q164 407 122 367Q91 333 85 295T76 253T69 250Q55 250 55 283ZM56 56Q56 71 72 76H706Q722 70 722 56Q722 44 707 36H70Q56 43 56 56Z\"><\/path><path id=\"MJX-1129-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1129-TEX-N-A0\" d=\"\"><\/path><path id=\"MJX-1129-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-1129-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-1129-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-1129-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-1129-TEX-N-2D9\" d=\"M190 609Q190 637 208 653T252 669Q275 667 292 652T309 609Q309 579 292 564T250 549Q225 549 208 564T190 609Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1129-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"2243\" xlink:href=\"#MJX-1129-TEX-N-2243\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1129-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(2360.6,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-1129-TEX-N-A0\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-1129-TEX-N-72\" transform=\"translate(250,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-1129-TEX-N-65\" transform=\"translate(642,0)\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1129-TEX-N-6C\" transform=\"translate(1086,0)\"><\/use><use data-c=\"A0\" xlink:href=\"#MJX-1129-TEX-N-A0\" transform=\"translate(1364,0)\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(3974.6,0)\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1129-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(379,239) translate(-250 0)\"><use data-c=\"2D9\" xlink:href=\"#MJX-1129-TEX-N-2D9\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f\\simeq g\\text{ rel }\\dot{I}<\/script>, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.341ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 2360.6 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1130-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1130-TEX-N-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path id=\"MJX-1130-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1130-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"223C\" xlink:href=\"#MJX-1130-TEX-N-223C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.6,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1130-TEX-I-1D454\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f\\sim g<\/script>\u200b\u200b.<\/p>\n<p>And thus <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.978ex\" height=\"2.351ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 3084.1 1038.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1131-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1131-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1131-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1131-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1131-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(772.2,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1131-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1494.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1131-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(636,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1131-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1131-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f*f^{-1}<\/script> is a boundary; hence, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.607ex\" height=\"2.351ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 3362.1 1038.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1132-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1132-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1132-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1132-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1132-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(772.2,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1132-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1772.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1132-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(636,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1132-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1132-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f+f^{-1}<\/script> is a boundary by lemma 3.2. <\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.713ex\" height=\"2.744ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1008 6061.1 1213\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1133-TEX-I-1D439\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><path id=\"MJX-1133-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1133-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1133-TEX-N-2243\" d=\"M55 283Q55 356 103 409T217 463Q262 463 297 447T395 382Q431 355 446 344T493 320T554 307H558Q613 307 652 344T694 433Q694 464 708 464T722 432Q722 356 673 304T564 251H554Q510 251 465 275T387 329T310 382T223 407H219Q164 407 122 367Q91 333 85 295T76 253T69 250Q55 250 55 283ZM56 56Q56 71 72 76H706Q722 70 722 56Q722 44 707 36H70Q56 43 56 56Z\"><\/path><path id=\"MJX-1133-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1133-TEX-N-A0\" d=\"\"><\/path><path id=\"MJX-1133-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-1133-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-1133-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-1133-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-1133-TEX-N-2D9\" d=\"M190 609Q190 637 208 653T252 669Q275 667 292 652T309 609Q309 579 292 564T250 549Q225 549 208 564T190 609Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-1133-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1026.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1133-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1582.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1133-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2410.3,0)\"><use data-c=\"2243\" xlink:href=\"#MJX-1133-TEX-N-2243\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3466.1,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1133-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(3943.1,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-1133-TEX-N-A0\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-1133-TEX-N-72\" transform=\"translate(250,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-1133-TEX-N-65\" transform=\"translate(642,0)\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1133-TEX-N-6C\" transform=\"translate(1086,0)\"><\/use><use data-c=\"A0\" xlink:href=\"#MJX-1133-TEX-N-A0\" transform=\"translate(1364,0)\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(5557.1,0)\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1133-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(379,239) translate(-250 0)\"><use data-c=\"2D9\" xlink:href=\"#MJX-1133-TEX-N-2D9\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">F:f\\simeq g\\text{ rel }\\dot{I}<\/script> be the homotopy.<\/p>\n<p>Define<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n448\" cid=\"n448\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"41.719ex\" height=\"9.015ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -2242.4 18439.9 3984.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" 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data-mml-node=\"mtr\" transform=\"translate(0,775.4)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-70-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(550,0)\"><use data-c=\"28\" xlink:href=\"#MJX-70-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(939,0)\"><use data-c=\"30\" xlink:href=\"#MJX-70-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1439,0)\"><use data-c=\"29\" xlink:href=\"#MJX-70-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1828,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-70-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(7677.3,0)\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-70-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-70-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1075.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-70-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2131.1,0)\"><use data-c=\"30\" xlink:href=\"#MJX-70-TEX-N-30\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2631.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-70-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-563.3)\"><g data-mml-node=\"mtd\"><g data-mml-node=\"mi\"><use data-c=\"1D439\" xlink:href=\"#MJX-70-TEX-I-1D439\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(749,0)\"><use data-c=\"28\" xlink:href=\"#MJX-70-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1138,0)\"><use data-c=\"31\" xlink:href=\"#MJX-70-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1860.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-70-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2860.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-70-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-70-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3658,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-70-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mfrac\" transform=\"translate(4102.7,0)\"><g data-mml-node=\"msub\" transform=\"translate(671.8,446.1) scale(0.707)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-70-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-70-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mrow\" transform=\"translate(220,-345) scale(0.707)\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-70-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(500,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-70-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1278,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-70-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-70-TEX-N-30\"><\/use><\/g><\/g><\/g><rect width=\"1667.6\" height=\"60\" x=\"120\" y=\"220\"><\/rect><\/g><g data-mml-node=\"mo\" transform=\"translate(6010.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-70-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6399.3,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-70-TEX-N-2C\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(7677.3,0)\"><g data-mml-node=\"mtext\"><use data-c=\"6F\" xlink:href=\"#MJX-70-TEX-N-6F\"><\/use><use data-c=\"74\" xlink:href=\"#MJX-70-TEX-N-74\" transform=\"translate(500,0)\"><\/use><use data-c=\"68\" xlink:href=\"#MJX-70-TEX-N-68\" transform=\"translate(889,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-70-TEX-N-65\" transform=\"translate(1445,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-70-TEX-N-72\" transform=\"translate(1889,0)\"><\/use><use data-c=\"77\" xlink:href=\"#MJX-70-TEX-N-77\" transform=\"translate(2281,0)\"><\/use><use data-c=\"69\" xlink:href=\"#MJX-70-TEX-N-69\" transform=\"translate(3003,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-70-TEX-N-73\" transform=\"translate(3281,0)\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-70-TEX-N-65\" transform=\"translate(3675,0)\"><\/use><use data-c=\"2E\" xlink:href=\"#MJX-70-TEX-N-2E\" transform=\"translate(4119,0)\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(12824.3,0) translate(0 250)\"><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>The definition of this map is illustrated in the following picture.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/fsimeqg.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/fsimeqg.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=35%\/><\/div><\/p>\n<p>Then, it&#39;s obvious that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.424ex\" height=\"2.081ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -715 6375.4 920\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1134-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-1134-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1134-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1134-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1134-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1134-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1134-TEX-N-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1134-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-1134-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1134-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1414.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1134-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2470.6,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1134-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3242.8,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1134-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4243,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1134-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4942.2,0)\"><use data-c=\"2B\" xlink:href=\"#MJX-1134-TEX-N-2B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5942.4,0)\"><use data-c=\"1D450\" xlink:href=\"#MJX-1134-TEX-I-1D450\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\sigma=f-g+c<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.896ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7467.9 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1135-TEX-I-1D450\" d=\"M34 159Q34 268 120 355T306 442Q362 442 394 418T427 355Q427 326 408 306T360 285Q341 285 330 295T319 325T330 359T352 380T366 386H367Q367 388 361 392T340 400T306 404Q276 404 249 390Q228 381 206 359Q162 315 142 235T121 119Q121 73 147 50Q169 26 205 26H209Q321 26 394 111Q403 121 406 121Q410 121 419 112T429 98T420 83T391 55T346 25T282 0T202 -11Q127 -11 81 37T34 159Z\"><\/path><path id=\"MJX-1135-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1135-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1135-TEX-I-1D461\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path id=\"MJX-1135-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1135-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1135-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1135-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1135-TEX-N-21A6\" d=\"M95 155V109Q95 83 92 73T75 63Q61 63 58 74T54 130Q54 140 54 180T55 250Q55 421 57 425Q61 437 75 437Q88 437 91 428T95 393V345V270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H95V155Z\"><\/path><path id=\"MJX-1135-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D450\" xlink:href=\"#MJX-1135-TEX-I-1D450\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(710.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1135-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1266.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1135-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1655.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-1135-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1135-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2453.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1135-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2897.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D461\" xlink:href=\"#MJX-1135-TEX-I-1D461\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(394,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1135-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3695.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1135-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4362.1,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-1135-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5639.9,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1135-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6189.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1135-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(6578.9,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1135-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7078.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1135-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">c:(t_0,t_1)\\mapsto f(1)<\/script> is a constant map.<\/p>\n<p>Therefore, by lemma 3.2, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.248ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6297.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1136-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1136-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1136-TEX-I-1D454\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1136-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1136-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1136-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1136-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1136-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1136-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1136-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(772.2,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1136-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1772.4,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1136-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2527.2,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1136-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3472,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1136-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1136-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4667.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1136-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5056.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1136-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5908.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1136-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f-g\\in B_1(X)<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>4.4 Definition.<\/strong><\/p>\n<p>The <strong>Hurewicz map<\/strong> is<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n456\" cid=\"n456\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" 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680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-71-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-71-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 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230H95V155Z\"><\/path><path id=\"MJX-71-TEX-N-63\" d=\"M370 305T349 305T313 320T297 358Q297 381 312 396Q317 401 317 402T307 404Q281 408 258 408Q209 408 178 376Q131 329 131 219Q131 137 162 90Q203 29 272 29Q313 29 338 55T374 117Q376 125 379 127T395 129H409Q415 123 415 120Q415 116 411 104T395 71T366 33T318 2T249 -11Q163 -11 99 53T34 214Q34 318 99 383T250 448T370 421T404 357Q404 334 387 320Z\"><\/path><path id=\"MJX-71-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-71-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 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transform=\"translate(1429.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-71-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-71-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2436.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-71-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2825.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-71-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3677.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-71-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4121.8,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-71-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-71-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5130.3,0)\"><use data-c=\"29\" xlink:href=\"#MJX-71-TEX-N-29\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(5519.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-71-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1555.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-71-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-71-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2823.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-71-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3212.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-71-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4064.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-71-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4453.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-71-TEX-N-2C\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-650)\"><g data-mml-node=\"mtd\" transform=\"translate(4413.3,0)\"><g data-mml-node=\"mo\"><use data-c=\"5B\" xlink:href=\"#MJX-71-TEX-N-5B\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(278,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-71-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(828,0)\"><use data-c=\"5D\" xlink:href=\"#MJX-71-TEX-N-5D\"><\/use><\/g><\/g><g data-mml-node=\"mtd\" transform=\"translate(5519.3,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"21A6\" xlink:href=\"#MJX-71-TEX-N-21A6\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1555.6,0)\"><use data-c=\"63\" xlink:href=\"#MJX-71-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-71-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-71-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2838.2,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-71-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3388.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-71-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>By lemma 4.1, 4.2 and 4.3, we can know that <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.348ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 596 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1141-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1141-TEX-I-1D719\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi<\/script> is a well-defined homomorphism.<\/p>\n<\/blockquote>\n<p>As we can see, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.556ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2897.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1155-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1155-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1155-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1155-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1155-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1155-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1155-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1155-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1155-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1155-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1(X)<\/script> is a abelian group, while <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"1.314ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 1006.6 581\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1196-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1196-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1196-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1196-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\pi_1<\/script> may not. Therefore, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.348ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 596 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1141-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1141-TEX-I-1D719\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi<\/script> induces a homomorphism<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n459\" cid=\"n459\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.179ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 10687 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-72-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-72-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 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358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-72-TEX-N-7E\" d=\"M179 251Q164 251 151 245T131 234T111 215L97 227L83 238Q83 239 95 253T121 283T142 304Q165 318 187 318T253 300T320 282Q335 282 348 288T368 299T388 318L402 306L416 295Q375 236 344 222Q330 215 313 215Q292 215 248 233T179 251Z\"><\/path><path id=\"MJX-72-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-72-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 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data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-72-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-72-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-72-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2872.7,0)\"><use data-c=\"28\" xlink:href=\"#MJX-72-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3261.7,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-72-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4113.7,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-72-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4558.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-72-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-72-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5566.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-72-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6233.7,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-72-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7511.4,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-72-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-72-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8779,0)\"><use data-c=\"28\" xlink:href=\"#MJX-72-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9168,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-72-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10020,0)\"><use data-c=\"29\" xlink:href=\"#MJX-72-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10409,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-72-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>In fact, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.336ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 1032.6 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1189-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1189-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1189-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1189-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*<\/script>\u200b is an isomorphism, I will show you soon.<\/p>\n<p>To prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.336ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 1032.6 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1189-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1189-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1189-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1189-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*<\/script>\u200b is an isomorphism, we can try to construct its inverse.<\/p>\n<p>Since <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is path-connected, for all <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.988ex\" height=\"1.636ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 2646.6 723\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.09ex;\"><defs><path id=\"MJX-1145-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1145-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1145-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1145-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(849.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1145-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1794.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1145-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x\\in X<\/script> there is a path <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.644ex\" height=\"1.902ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1168.5 840.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1146-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1146-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1146-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(714,-150) scale(0.707)\"><use data-c=\"1D465\" xlink:href=\"#MJX-1146-TEX-I-1D465\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">L_x<\/script> from <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.282ex\" height=\"1.375ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1008.6 607.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1201-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1201-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1201-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1201-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0<\/script> to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.294ex\" height=\"1.025ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 572 453\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1148-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1148-TEX-I-1D465\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x<\/script>\u200b.<\/p>\n<p>For each <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1184-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1184-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1<\/script>-simplex <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script>, which is also a path, define <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"23.768ex\" height=\"3.921ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1199.5 10505.6 1733\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -1.207ex;\"><defs><path id=\"MJX-1151-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1151-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1151-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1151-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1151-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1151-TEX-I-1D43F\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 217 683Q271 680 344 680Q485 680 506 683H518Q524 677 524 674T522 656Q517 641 513 637H475Q406 636 394 628Q387 624 380 600T313 336Q297 271 279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1151-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-1151-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1151-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1151-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1151-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1151-TEX-S4-2013\" d=\"M0 248V285H499V248H0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1151-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(651,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1151-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1040,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1151-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1611,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1151-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1151-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mover\" transform=\"translate(3333.6,0)\"><g data-mml-node=\"mrow\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1151-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-176.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1151-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(571,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1151-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(960,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1151-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1151-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1862.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1151-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2578.3,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1151-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3300.5,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1151-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4093.8,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-1151-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(4816,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1151-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,411.6) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1151-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1151-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-356.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1151-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(571,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1151-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(960,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1151-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1151-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1862.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1151-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(0,814.5)\"><svg width=\"7172.1\" height=\"237\" x=\"0\" y=\"148\" viewBox=\"1793 148 7172.1 237\"><use data-c=\"2013\" xlink:href=\"#MJX-1151-TEX-S4-2013\" transform=\"scale(21.516,1)\"><\/use><\/svg><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi(\\sigma)=\\overline{L_{\\sigma(e_0)}*\\sigma*L^{-1}_{\\sigma(e_1)}}<\/script>\u200b\u200b.<\/p>\n<p>Then by extending <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> by linearity, we get a homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22.193ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9809.4 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1153-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1153-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1153-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-1153-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 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transform=\"translate(2923.1,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1153-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3775.1,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1153-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4441.9,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1153-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5719.7,0)\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1153-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1153-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1153-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6726.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1153-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7115.2,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1153-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7967.2,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1153-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(8411.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1153-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1153-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9420.4,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1153-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi:S_1(X)\\to \\tilde \\pi_1(X,x_0)<\/script>.<\/p>\n<p>To ensure <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> can induce a map from <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.556ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2897.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1155-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 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678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1155-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1155-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1155-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1155-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1155-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1155-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1(X)<\/script> to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"2.036ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 1006.6 900\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1156-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1156-TEX-N-7E\" d=\"M179 251Q164 251 151 245T131 234T111 215L97 227L83 238Q83 239 95 253T121 283T142 304Q165 318 187 318T253 300T320 282Q335 282 348 288T368 299T388 318L402 306L416 295Q375 236 344 222Q330 215 313 215Q292 215 248 233T179 251Z\"><\/path><path id=\"MJX-1156-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1156-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1156-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1156-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\tilde\\pi_1<\/script>, we should check <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.346ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6340.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1170-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1170-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1170-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1170-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1170-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1170-TEX-N-2282\" d=\"M84 250Q84 372 166 450T360 539Q361 539 370 539T395 539T430 540T475 540T524 540H679Q694 532 694 520Q694 511 681 501L522 500H470H441Q366 500 338 496T266 472Q244 461 224 446T179 404T139 337T124 250V245Q124 157 185 89Q244 25 328 7Q348 2 366 2T522 0H681Q694 -10 694 -20Q694 -32 679 -40H526Q510 -40 480 -40T434 -41Q350 -41 289 -25T172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1170-TEX-N-6B\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T97 124T98 167T98 217T98 272T98 329Q98 366 98 407T98 482T98 542T97 586T97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V463L180 233L240 287Q300 341 304 347Q310 356 310 364Q310 383 289 385H284V431H293Q308 428 412 428Q475 428 484 431H489V385H476Q407 380 360 341Q286 278 286 274Q286 273 349 181T420 79Q434 60 451 53T500 46H511V0H505Q496 3 418 3Q322 3 307 0H299V46H306Q330 48 330 65Q330 72 326 79Q323 84 276 153T228 222L176 176V120V84Q176 65 178 59T189 49Q210 46 238 46H254V0H246Q231 3 137 3T28 0H20V46H36Z\"><\/path><path id=\"MJX-1170-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-1170-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-1170-TEX-N-2061\" d=\"\"><\/path><path id=\"MJX-1170-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1170-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1170-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1195.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1170-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1584.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1170-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2436.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1170-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3103.3,0)\"><use data-c=\"2282\" xlink:href=\"#MJX-1170-TEX-N-2282\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4159.1,0)\"><use data-c=\"6B\" xlink:href=\"#MJX-1170-TEX-N-6B\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-1170-TEX-N-65\" transform=\"translate(528,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-1170-TEX-N-72\" transform=\"translate(972,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5523.1,0)\"><use data-c=\"2061\" xlink:href=\"#MJX-1170-TEX-N-2061\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5689.8,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-1170-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_0(X)\\subset\\ker\\psi<\/script>.<\/p>\n<blockquote><p><strong>4.5 Lemma.<\/strong><\/p>\n<p>The map <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> takes the group <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.393ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2825.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1159-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1159-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1159-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1159-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1159-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1159-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1159-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1195.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1159-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1584.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1159-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2436.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1159-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_1(X)<\/script> into <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"6.174ex\" height=\"2.036ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 2729.1 900\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1160-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1160-TEX-N-2208\" d=\"M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1160-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1160-TEX-N-7E\" d=\"M179 251Q164 251 151 245T131 234T111 215L97 227L83 238Q83 239 95 253T121 283T142 304Q165 318 187 318T253 300T320 282Q335 282 348 288T368 299T388 318L402 306L416 295Q375 236 344 222Q330 215 313 215Q292 215 248 233T179 251Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1160-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(777.8,0)\"><use data-c=\"2208\" xlink:href=\"#MJX-1160-TEX-N-2208\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1722.6,0)\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1160-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1160-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1160-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1\\in\\tilde\\pi_1<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.292ex\" height=\"1ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 571 442\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.025ex;\"><defs><path id=\"MJX-1161-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1161-TEX-I-1D70E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma<\/script> be a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1167-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"32\" xlink:href=\"#MJX-1167-TEX-N-32\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">2<\/script>-simplex. Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.711ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4292.5 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1163-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1163-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1163-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-1163-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1163-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1163-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1163-TEX-I-1D466\" d=\"M21 287Q21 301 36 335T84 406T158 442Q199 442 224 419T250 355Q248 336 247 334Q247 331 231 288T198 191T182 105Q182 62 196 45T238 27Q261 27 281 38T312 61T339 94Q339 95 344 114T358 173T377 247Q415 397 419 404Q432 431 462 431Q475 431 483 424T494 412T496 403Q496 390 447 193T391 -23Q363 -106 294 -155T156 -205Q111 -205 77 -183T43 -117Q43 -95 50 -80T69 -58T89 -48T106 -45Q150 -45 150 -87Q150 -107 138 -122T115 -142T102 -147L99 -148Q101 -153 118 -160T152 -167H160Q177 -167 186 -165Q219 -156 247 -127T290 -65T313 -9T321 21L315 17Q309 13 296 6T270 -6Q250 -11 231 -11Q185 -11 150 11T104 82Q103 89 103 113Q103 170 138 262T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1163-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(571,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1163-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(960,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1163-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1163-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1753,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1163-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2419.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1163-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3475.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D466\" xlink:href=\"#MJX-1163-TEX-I-1D466\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1163-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma(e_i)=y_i<\/script> for <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.203ex\" height=\"1.946ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 4067.9 860\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.439ex;\"><defs><path id=\"MJX-1164-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1164-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1164-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 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611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D456\" xlink:href=\"#MJX-1164-TEX-I-1D456\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(622.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1164-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(1678.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1164-TEX-N-31\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2178.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1164-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(2623.2,0)\"><use data-c=\"32\" xlink:href=\"#MJX-1164-TEX-N-32\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3123.2,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1164-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3567.9,0)\"><use data-c=\"33\" xlink:href=\"#MJX-1164-TEX-N-33\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">i=1,2,3<\/script> and <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"28.684ex\" height=\"2.452ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 12678.3 1083.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1165-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><path id=\"MJX-1165-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1165-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1165-TEX-I-1D700\" d=\"M190 -22Q124 -22 76 11T27 107Q27 174 97 232L107 239L99 248Q76 273 76 304Q76 364 144 408T290 452H302Q360 452 405 421Q428 405 428 392Q428 381 417 369T391 356Q382 356 371 365T338 383T283 392Q217 392 167 368T116 308Q116 289 133 272Q142 263 145 262T157 264Q188 278 238 278H243Q308 278 308 247Q308 206 223 206Q177 206 142 219L132 212Q68 169 68 112Q68 39 201 39Q253 39 286 49T328 72T345 94T362 105Q376 103 376 88Q376 79 365 62T334 26T275 -8T190 -22Z\"><\/path><path id=\"MJX-1165-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 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298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 393T328 402T306 405Q262 405 221 352Q191 313 171 233T151 117Q151 38 213 38Q269 38 323 108L331 118L384 328Z\"><\/path><path id=\"MJX-1165-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1165-TEX-I-210E\" d=\"M137 683Q138 683 209 688T282 694Q294 694 294 685Q294 674 258 534Q220 386 220 383Q220 381 227 388Q288 442 357 442Q411 442 444 415T478 336Q478 285 440 178T402 50Q403 36 407 31T422 26Q450 26 474 56T513 138Q516 149 519 151T535 153Q555 153 555 145Q555 144 551 130Q535 71 500 33Q466 -10 419 -10H414Q367 -10 346 17T325 74Q325 90 361 192T398 345Q398 404 354 404H349Q266 404 205 306L198 293L164 158Q132 28 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738Q55 746 60 749Z\"><\/path><path id=\"MJX-1165-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1165-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(827.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1165-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1883.6,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1165-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2454.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-1165-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"32\" xlink:href=\"#MJX-1165-TEX-N-32\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3357.1,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1165-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3801.8,0)\"><use data-c=\"1D454\" xlink:href=\"#MJX-1165-TEX-I-1D454\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4556.6,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1165-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5612.3,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1165-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6183.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-1165-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1165-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7085.9,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1165-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7530.6,0)\"><use data-c=\"210E\" xlink:href=\"#MJX-1165-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8384.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1165-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9440.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1165-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9829.1,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1165-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(10400.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D700\" xlink:href=\"#MJX-1165-TEX-I-1D700\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1165-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"msup\" transform=\"translate(11302.7,0)\"><g data-mml-node=\"mo\"><use data-c=\"29\" xlink:href=\"#MJX-1165-TEX-N-29\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(422,363) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1165-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1165-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f=\\sigma\\varepsilon_2,g=\\sigma\\varepsilon_0,h=(\\sigma\\varepsilon_1)^{-1}<\/script>\u200b.<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/hurewicz.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/qwq.cafe\/wp-content\/uploads\/2024\/04\/hurewicz.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" width=60%\/><\/div><\/p>\n<p>Then<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n473\" cid=\"n473\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"56.72ex\" height=\"20.115ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -4695.4 25070 8890.7\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -9.492ex;\"><defs><path id=\"MJX-73-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 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xlink:href=\"#MJX-73-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5279.5,0)\"><use data-c=\"210E\" xlink:href=\"#MJX-73-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6077.7,0)\"><use data-c=\"2217\" xlink:href=\"#MJX-73-TEX-N-2217\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(6799.9,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-73-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,411.6) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-73-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-73-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-138.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D466\" xlink:href=\"#MJX-73-TEX-I-1D466\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-73-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(0,814.5)\"><svg width=\"8467.6\" height=\"237\" x=\"0\" y=\"148\" viewBox=\"2116.9 148 8467.6 237\"><use data-c=\"2013\" xlink:href=\"#MJX-73-TEX-S4-2013\" transform=\"scale(25.403,1)\"><\/use><\/svg><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>For <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"7.9ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 3491.9 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1166-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 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transform=\"translate(2915.9,0)\"><use data-c=\"210E\" xlink:href=\"#MJX-1166-TEX-I-210E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f*g*h<\/script> is a boundary of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1167-TEX-N-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"32\" xlink:href=\"#MJX-1167-TEX-N-32\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">2<\/script>-simplex, which is nullhomotopic rel <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.14ex\" height=\"2.281ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -1008 504 1008\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1168-TEX-I-1D43C\" d=\"M43 1Q26 1 26 10Q26 12 29 24Q34 43 39 45Q42 46 54 46H60Q120 46 136 53Q137 53 138 54Q143 56 149 77T198 273Q210 318 216 344Q286 624 286 626Q284 630 284 631Q274 637 213 637H193Q184 643 189 662Q193 677 195 680T209 683H213Q285 681 359 681Q481 681 487 683H497Q504 676 504 672T501 655T494 639Q491 637 471 637Q440 637 407 634Q393 631 388 623Q381 609 337 432Q326 385 315 341Q245 65 245 59Q245 52 255 50T307 46H339Q345 38 345 37T342 19Q338 6 332 0H316Q279 2 179 2Q143 2 113 2T65 2T43 1Z\"><\/path><path id=\"MJX-1168-TEX-N-2D9\" d=\"M190 609Q190 637 208 653T252 669Q275 667 292 652T309 609Q309 579 292 564T250 549Q225 549 208 564T190 609Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D43C\" xlink:href=\"#MJX-1168-TEX-I-1D43C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(379,239) translate(-250 0)\"><use data-c=\"2D9\" xlink:href=\"#MJX-1168-TEX-N-2D9\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\dot I<\/script> (Rotman, Exercise 3.4), <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"9.954ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4399.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1169-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1169-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1169-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-1169-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1169-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1169-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1169-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1169-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(651,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1169-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1040,0)\"><use data-c=\"1D715\" xlink:href=\"#MJX-1169-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1606,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1169-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2177,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1169-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2843.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1169-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3899.6,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1169-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi(\\partial\\sigma)=1<\/script>.<\/p>\n<p>Therefore, by the universal property of the abelian group, we get <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14.346ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6340.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1170-TEX-I-1D435\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path id=\"MJX-1170-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1170-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1170-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1170-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1170-TEX-N-2282\" d=\"M84 250Q84 372 166 450T360 539Q361 539 370 539T395 539T430 540T475 540T524 540H679Q694 532 694 520Q694 511 681 501L522 500H470H441Q366 500 338 496T266 472Q244 461 224 446T179 404T139 337T124 250V245Q124 157 185 89Q244 25 328 7Q348 2 366 2T522 0H681Q694 -10 694 -20Q694 -32 679 -40H526Q510 -40 480 -40T434 -41Q350 -41 289 -25T172 45Q84 127 84 250Z\"><\/path><path id=\"MJX-1170-TEX-N-6B\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T97 124T98 167T98 217T98 272T98 329Q98 366 98 407T98 482T98 542T97 586T97 603Q94 622 83 628T38 637H20V660Q20 683 22 683L32 684Q42 685 61 686T98 688Q115 689 135 690T165 693T176 694H179V463L180 233L240 287Q300 341 304 347Q310 356 310 364Q310 383 289 385H284V431H293Q308 428 412 428Q475 428 484 431H489V385H476Q407 380 360 341Q286 278 286 274Q286 273 349 181T420 79Q434 60 451 53T500 46H511V0H505Q496 3 418 3Q322 3 307 0H299V46H306Q330 48 330 65Q330 72 326 79Q323 84 276 153T228 222L176 176V120V84Q176 65 178 59T189 49Q210 46 238 46H254V0H246Q231 3 137 3T28 0H20V46H36Z\"><\/path><path id=\"MJX-1170-TEX-N-65\" d=\"M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z\"><\/path><path id=\"MJX-1170-TEX-N-72\" d=\"M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z\"><\/path><path id=\"MJX-1170-TEX-N-2061\" d=\"\"><\/path><path id=\"MJX-1170-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D435\" xlink:href=\"#MJX-1170-TEX-I-1D435\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(792,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1170-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1195.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1170-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1584.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1170-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2436.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1170-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3103.3,0)\"><use data-c=\"2282\" xlink:href=\"#MJX-1170-TEX-N-2282\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4159.1,0)\"><use data-c=\"6B\" xlink:href=\"#MJX-1170-TEX-N-6B\"><\/use><use data-c=\"65\" xlink:href=\"#MJX-1170-TEX-N-65\" transform=\"translate(528,0)\"><\/use><use data-c=\"72\" xlink:href=\"#MJX-1170-TEX-N-72\" transform=\"translate(972,0)\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5523.1,0)\"><use data-c=\"2061\" xlink:href=\"#MJX-1170-TEX-N-2061\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5689.8,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-1170-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">B_0(X)\\subset\\ker\\psi<\/script>. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<p>Consequently, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.473ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 651 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1172-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1172-TEX-I-1D713\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi<\/script> induces the homomorphism <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16.699ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 7380.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1173-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1173-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1173-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1173-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 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data-c=\"29\" xlink:href=\"#MJX-1173-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(5096.4,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1173-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6374.2,0)\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1173-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-1173-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1173-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi_*:H_1(X)\\to \\tilde\\pi_1<\/script>.<\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" 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transform=\"translate(3725.9,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1175-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4781.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1175-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(684,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1175-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(6035.9,0)\"><use data-c=\"63\" xlink:href=\"#MJX-1175-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1175-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-1175-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7318.5,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1175-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8146.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1175-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mover\" transform=\"translate(9202.1,0)\"><g data-mml-node=\"mrow\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1175-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-150) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1175-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1175-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(1477.2,0)\"><use data-c=\"1D453\" xlink:href=\"#MJX-1175-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"msubsup\" transform=\"translate(2027.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1175-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,411.6) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mo\"><use data-c=\"2212\" xlink:href=\"#MJX-1175-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(778,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1175-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-138.9) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1175-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1175-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(0,814.5)\"><svg width=\"3694.8\" height=\"237\" x=\"0\" y=\"148\" viewBox=\"923.7 148 3694.8 237\"><use data-c=\"2013\" xlink:href=\"#MJX-1175-TEX-S4-2013\" transform=\"scale(11.085,1)\"><\/use><\/svg><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(13174.7,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1175-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mover\" transform=\"translate(14230.5,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1175-TEX-I-1D453\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(25,637)\"><use data-c=\"2013\" xlink:href=\"#MJX-1175-TEX-N-2013\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi_*\\phi_*(\\overline f)=\\psi_*\\operatorname{cls} f=\\overline{L_{x_0}fL_{x_0}^{-1}}=\\overline f<\/script>.<\/p>\n<p>Thus, to show <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.461ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 1087.6 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1176-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1176-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1176-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(684,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1176-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\psi_*<\/script> is the inverse of <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.336ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 1032.6 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1189-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1189-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1189-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1189-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*<\/script>, it&#39;s sufficient to prove <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.945ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 3953.7 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1178-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1178-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1178-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1178-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1178-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1178-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1178-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(1032.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D713\" xlink:href=\"#MJX-1178-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(684,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1178-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2397.9,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1178-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(3453.7,0)\"><use data-c=\"31\" xlink:href=\"#MJX-1178-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*\\psi_*=1<\/script>.<\/p>\n<blockquote><p><strong>4.6 Lemma.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.229ex\" height=\"1.486ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -441 543 657\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.489ex;\"><defs><path id=\"MJX-1179-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1179-TEX-I-1D6FE\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma<\/script> is a <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1184-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1184-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1<\/script>-cycle, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"13.945ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 6163.8 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1181-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1181-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-1181-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 288T605 220Q573 125 492 57T329 -11H319L296 -104Q272 -198 272 -199Q270 -205 252 -205H239Q233 -199 233 -197Q233 -192 256 -102T279 -9Q272 -8 265 -8Q106 14 106 139Q106 174 139 264T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Q21 299 34 333T82 404T161 441Z\"><\/path><path id=\"MJX-1181-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1181-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-1181-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1181-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1181-TEX-N-63\" d=\"M370 305T349 305T313 320T297 358Q297 381 312 396Q317 401 317 402T307 404Q281 408 258 408Q209 408 178 376Q131 329 131 219Q131 137 162 90Q203 29 272 29Q313 29 338 55T374 117Q376 125 379 127T395 129H409Q415 123 415 120Q415 116 411 104T395 71T366 33T318 2T249 -11Q163 -11 99 53T34 214Q34 318 99 383T250 448T370 421T404 357Q404 334 387 320Z\"><\/path><path id=\"MJX-1181-TEX-N-6C\" d=\"M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z\"><\/path><path id=\"MJX-1181-TEX-N-73\" d=\"M295 316Q295 356 268 385T190 414Q154 414 128 401Q98 382 98 349Q97 344 98 336T114 312T157 287Q175 282 201 278T245 269T277 256Q294 248 310 236T342 195T359 133Q359 71 321 31T198 -10H190Q138 -10 94 26L86 19L77 10Q71 4 65 -1L54 -11H46H42Q39 -11 33 -5V74V132Q33 153 35 157T45 162H54Q66 162 70 158T75 146T82 119T101 77Q136 26 198 26Q295 26 295 104Q295 133 277 151Q257 175 194 187T111 210Q75 227 54 256T33 318Q33 357 50 384T93 424T143 442T187 447H198Q238 447 268 432L283 424L292 431Q302 440 314 448H322H326Q329 448 335 442V310L329 304H301Q295 310 295 316Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1181-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1181-TEX-N-2217\"><\/use><\/g><\/g><g data-mml-node=\"mi\" transform=\"translate(1032.6,0)\"><use data-c=\"1D713\" xlink:href=\"#MJX-1181-TEX-I-1D713\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1683.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1181-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2072.6,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1181-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2615.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1181-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3282.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1181-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(4338.1,0)\"><use data-c=\"63\" xlink:href=\"#MJX-1181-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-1181-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-1181-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(5620.8,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1181-TEX-I-1D6FE\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*\\psi(\\gamma)=\\operatorname{cls}\\gamma<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.77ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 5202.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1182-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-1182-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1182-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-1182-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1182-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1182-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1182-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(820.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1182-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1876.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-1182-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3099.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-1182-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1182-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"msub\" transform=\"translate(4304.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1182-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1182-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\gamma = \\sum m_i\\sigma_i<\/script>, where <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.032ex\" height=\"1.332ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 898 588.8\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.357ex;\"><defs><path id=\"MJX-1183-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1183-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1183-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1183-TEX-I-1D456\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sigma_i<\/script> are <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.131ex\" height=\"1.507ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -666 500 666\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1184-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mn\"><use data-c=\"31\" xlink:href=\"#MJX-1184-TEX-N-31\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">1<\/script>-simplices.<\/p>\n<p>Then we have <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"30.62ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 13534.2 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1185-TEX-I-1D715\" d=\"M202 508Q179 508 169 520T158 547Q158 557 164 577T185 624T230 675T301 710L333 715H345Q378 715 384 714Q447 703 489 661T549 568T566 457Q566 362 519 240T402 53Q321 -22 223 -22Q123 -22 73 56Q42 102 42 148V159Q42 276 129 370T322 465Q383 465 414 434T455 367L458 378Q478 461 478 515Q478 603 437 639T344 676Q266 676 223 612Q264 606 264 572Q264 547 246 528T202 508ZM430 306Q430 372 401 400T333 428Q270 428 222 382Q197 354 183 323T150 221Q132 149 132 116Q132 21 232 21Q244 21 250 22Q327 35 374 112Q389 137 409 196T430 306Z\"><\/path><path id=\"MJX-1185-TEX-I-1D6FE\" d=\"M31 249Q11 249 11 258Q11 275 26 304T66 365T129 418T206 441Q233 441 239 440Q287 429 318 386T371 255Q385 195 385 170Q385 166 386 166L398 193Q418 244 443 300T486 391T508 430Q510 431 524 431H537Q543 425 543 422Q543 418 522 378T463 251T391 71Q385 55 378 6T357 -100Q341 -165 330 -190T303 -216Q286 -216 286 -188Q286 -138 340 32L346 51L347 69Q348 79 348 100Q348 257 291 317Q251 355 196 355Q148 355 108 329T51 260Q49 251 47 251Q45 249 31 249Z\"><\/path><path id=\"MJX-1185-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1185-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-1185-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1185-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1185-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1185-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1185-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-1185-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1185-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1185-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1185-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D715\" xlink:href=\"#MJX-1185-TEX-I-1D715\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(566,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-1185-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1386.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1185-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2442.6,0)\"><use data-c=\"2211\" xlink:href=\"#MJX-1185-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3665.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-1185-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1185-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4870.2,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1185-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5259.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1185-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1185-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6157.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1185-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6546.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1185-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1185-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(7448.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1185-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8059.9,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1185-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9060.1,0)\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1185-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(9631.1,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1185-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(10020.1,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1185-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1185-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(10922.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1185-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11311.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1185-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(11978.5,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1185-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(13034.2,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1185-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\partial\\gamma=\\sum m_i(\\sigma_i(e_0)-\\sigma(e_1))=0<\/script>; hence <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21.725ex\" height=\"2.497ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 9602.6 1103.5\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.8ex;\"><defs><path id=\"MJX-1186-TEX-SO-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path id=\"MJX-1186-TEX-I-1D45A\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-1186-TEX-I-1D456\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 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279 198T252 88L243 52Q243 48 252 48T311 46H328Q360 46 379 47T428 54T478 72T522 106T564 161Q580 191 594 228T611 270Q616 273 628 273H641Q647 264 647 262T627 203T583 83T557 9Q555 4 553 3T537 0T494 -1Q483 -1 418 -1T294 0H116Q32 0 32 10Q32 17 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1186-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path id=\"MJX-1186-TEX-I-1D452\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 442H310Q355 442 388 420T421 355Q421 265 310 237Q261 224 176 223Q139 223 138 221Q138 219 132 186T125 128Q125 81 146 54T209 26T302 45T394 111Q403 121 406 121Q410 121 419 112T429 98T420 82T390 55T344 24T281 -1T205 -11Q126 -11 83 42T39 168ZM373 353Q367 405 305 405Q272 405 244 391T199 357T170 316T154 280T149 261Q149 260 169 260Q282 260 327 284T373 353Z\"><\/path><path id=\"MJX-1186-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1186-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1186-TEX-N-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path id=\"MJX-1186-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"2211\" xlink:href=\"#MJX-1186-TEX-SO-2211\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1222.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D45A\" xlink:href=\"#MJX-1186-TEX-I-1D45A\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(911,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1186-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2427.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1186-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" 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xlink:href=\"#MJX-1186-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5626.1,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-1186-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(6626.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-1186-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-176.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-1186-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-1186-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(898,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1186-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1287,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-1186-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1186-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2189.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1186-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9213.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1186-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\sum m_i(L_{\\sigma_i(e_0)}-L_{\\sigma_i(e_1)})<\/script>.<\/p>\n<p>Therefore, by lemma 4.1-4.3, we have<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n486\" cid=\"n486\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"42.216ex\" height=\"23.249ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -5388 18659.5 10276\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -11.059ex;\"><defs><path id=\"MJX-74-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-74-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><path id=\"MJX-74-TEX-I-1D713\" d=\"M161 441Q202 441 226 417T250 358Q250 338 218 252T187 127Q190 85 214 61Q235 43 257 37Q275 29 288 29H289L371 360Q455 691 456 692Q459 694 472 694Q492 694 492 687Q492 678 411 356Q329 28 329 27T335 26Q421 26 498 114T576 278Q576 302 568 319T550 343T532 361T524 384Q524 405 541 424T583 443Q602 443 618 425T634 366Q634 337 623 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442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path id=\"MJX-74-TEX-I-1D70E\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 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data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-74-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(898,0)\"><use data-c=\"28\" xlink:href=\"#MJX-74-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1287,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-74-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-74-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2189.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-74-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(11678.5,0)\"><use data-c=\"2212\" xlink:href=\"#MJX-74-TEX-N-2212\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(12678.7,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43F\" xlink:href=\"#MJX-74-TEX-I-1D43F\"><\/use><\/g><g data-mml-node=\"TeXAtom\" transform=\"translate(714,-176.7) scale(0.707)\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70E\" xlink:href=\"#MJX-74-TEX-I-1D70E\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(604,-150) scale(0.707)\"><use data-c=\"1D456\" xlink:href=\"#MJX-74-TEX-I-1D456\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(898,0)\"><use data-c=\"28\" xlink:href=\"#MJX-74-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(1287,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D452\" xlink:href=\"#MJX-74-TEX-I-1D452\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(499,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-74-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2189.5,0)\"><use data-c=\"29\" xlink:href=\"#MJX-74-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(15266,0)\"><use data-c=\"29\" xlink:href=\"#MJX-74-TEX-N-29\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mtr\" transform=\"translate(0,-4638)\"><g data-mml-node=\"mtd\" transform=\"translate(3004.6,0)\"><\/g><g data-mml-node=\"mtd\" transform=\"translate(3004.6,0)\"><g data-mml-node=\"mi\"><\/g><g data-mml-node=\"mo\" transform=\"translate(277.8,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-74-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1333.6,0)\"><use data-c=\"63\" xlink:href=\"#MJX-74-TEX-N-63\"><\/use><use data-c=\"6C\" xlink:href=\"#MJX-74-TEX-N-6C\" transform=\"translate(444,0)\"><\/use><use data-c=\"73\" xlink:href=\"#MJX-74-TEX-N-73\" transform=\"translate(722,0)\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(2616.2,0)\"><use data-c=\"1D6FE\" xlink:href=\"#MJX-74-TEX-I-1D6FE\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3159.2,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-74-TEX-N-2E\"><\/use><\/g><g data-mml-node=\"mtext\" transform=\"translate(3603.9,0)\"><use data-c=\"A0\" xlink:href=\"#MJX-74-TEX-N-A0\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3853.9,0)\"><use data-c=\"25FB\" xlink:href=\"#MJX-74-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<\/blockquote>\n<p>Finally, we proved the Hurewicz theorem.<\/p>\n<blockquote><p><strong>4.7 Theorem (Hurewicz).<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 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type=\"math\/tex\">X<\/script> is a path-connected space with base point <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.282ex\" height=\"1.375ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1008.6 607.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1201-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1201-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1201-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1201-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0<\/script>, then<\/p>\n<div contenteditable=\"false\" 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250Z\"><\/path><path id=\"MJX-75-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-75-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-75-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path 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256H707Q722 248 722 236Q722 225 708 217L390 216H72Q56 221 56 236ZM56 42Q56 57 72 62H708Q722 52 722 42Q722 30 707 22H70Q56 29 56 42Z\"><\/path><path id=\"MJX-75-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-75-TEX-N-2E\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mover\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-75-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(285,332) translate(-250 0)\"><use data-c=\"7E\" xlink:href=\"#MJX-75-TEX-N-7E\"><\/use><\/g><\/g><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-75-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1006.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-75-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1395.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-75-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2247.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-75-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2692.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-75-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-75-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3700.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-75-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4367.6,0)\"><use data-c=\"2245\" xlink:href=\"#MJX-75-TEX-N-2245\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(5423.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-75-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-75-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(6690.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-75-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(7079.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-75-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7931.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-75-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(8320.9,0)\"><use data-c=\"2E\" xlink:href=\"#MJX-75-TEX-N-2E\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p><strong>Proof.<\/strong><\/p>\n<p>From what we talked above, <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.336ex\" height=\"2.034ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -694 1032.6 899\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1189-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1189-TEX-N-2217\" d=\"M229 286Q216 420 216 436Q216 454 240 464Q241 464 245 464T251 465Q263 464 273 456T283 436Q283 419 277 356T270 286L328 328Q384 369 389 372T399 375Q412 375 423 365T435 338Q435 325 425 315Q420 312 357 282T289 250L355 219L425 184Q434 175 434 161Q434 146 425 136T401 125Q393 125 383 131T328 171L270 213Q283 79 283 63Q283 53 276 44T250 35Q231 35 224 44T216 63Q216 80 222 143T229 213L171 171Q115 130 110 127Q106 124 100 124Q87 124 76 134T64 161Q64 166 64 169T67 175T72 181T81 188T94 195T113 204T138 215T170 230T210 250L74 315Q65 324 65 338Q65 353 74 363T98 374Q106 374 116 368T171 328L229 286Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1189-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(629,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-1189-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi_*<\/script> is the isomorphism. <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.76ex\" height=\"1.559ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -689 778 689\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1190-TEX-I-25FB\" d=\"M71 0Q59 4 55 16V346L56 676Q64 686 70 689H709Q719 681 722 674V15Q719 10 709 1L390 0H71ZM682 40V649H95V40H682Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"25FB\" xlink:href=\"#MJX-1190-TEX-I-25FB\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\square<\/script><\/p>\n<\/blockquote>\n<blockquote><p><strong>4.8 Corollay.<\/strong><\/p>\n<ul>\n<li><mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"11.718ex\" height=\"2.452ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -833.9 5179.3 1083.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1191-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1191-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1191-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1191-TEX-I-1D446\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path id=\"MJX-1191-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1191-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1191-TEX-D-2124\" d=\"M39 -1Q29 9 29 12Q29 23 60 77T219 337L410 648H364Q261 648 210 628Q168 612 142 588T109 545T97 509T88 490Q85 489 80 489Q72 489 61 503L70 588Q72 607 75 628T79 662T81 675Q84 677 88 681Q90 683 341 683H592Q604 673 604 666Q604 662 412 348L221 37Q221 35 301 35Q406 35 446 48Q504 68 543 111T597 212Q602 239 617 239Q624 239 629 234T635 223Q635 215 621 113T604 8L597 1Q595 -1 317 -1H39ZM148 637L166 648H112V632Q111 629 110 622T108 612Q108 608 110 608T116 612T129 623T148 637ZM552 646Q552 648 504 648Q452 648 450 643Q448 639 266 343T77 37Q77 35 128 35H179L366 339L552 646ZM572 35Q581 89 581 97L561 77Q542 59 526 48L508 37L539 35H572Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1191-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1191-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1191-TEX-N-28\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(1656.6,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D446\" xlink:href=\"#MJX-1191-TEX-I-1D446\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(729.6,363) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1191-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(2789.7,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1191-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3456.5,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1191-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\" transform=\"translate(4512.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"2124\" xlink:href=\"#MJX-1191-TEX-D-2124\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1(S^1)=\\mathbb Z<\/script>.<\/li>\n<li>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> is simply connected, then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10.704ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 4731.1 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1193-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1193-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1193-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1193-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1193-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1193-TEX-N-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path id=\"MJX-1193-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1193-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1193-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1193-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1193-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2508.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1193-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(3175.3,0)\"><use data-c=\"3D\" xlink:href=\"#MJX-1193-TEX-N-3D\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(4231.1,0)\"><use data-c=\"30\" xlink:href=\"#MJX-1193-TEX-N-30\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1(X)=0<\/script>.<\/li>\n\n<\/ul>\n<\/blockquote>\n<blockquote><p><strong>4.9 Theorem.<\/strong><\/p>\n<p>Let <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24.113ex\" height=\"2.48ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 10657.9 1096\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1194-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1194-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1194-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1194-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1194-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path id=\"MJX-1194-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1194-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1194-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1194-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1194-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1194-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1194-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msup\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1194-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(629,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1194-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1559.2,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1194-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(2115,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1194-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1194-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(3121.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1194-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(3510.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1194-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4362.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1194-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(4807.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1194-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1194-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(5815.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1194-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6482.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1194-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7760.3,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1194-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1194-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(9027.9,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1194-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(9416.9,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1194-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(10268.9,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1194-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\phi^X:\\pi_1(X,x_0)\\to H_1(X)<\/script>\u200b be the Hurewicz map.<\/p>\n<p>Then <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"5.162ex\" height=\"2.48ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -846 2281.5 1096\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1195-TEX-N-7B\" d=\"M434 -231Q434 -244 428 -250H410Q281 -250 230 -184Q225 -177 222 -172T217 -161T213 -148T211 -133T210 -111T209 -84T209 -47T209 0Q209 21 209 53Q208 142 204 153Q203 154 203 155Q189 191 153 211T82 231Q71 231 68 234T65 250T68 266T82 269Q116 269 152 289T203 345Q208 356 208 377T209 529V579Q209 634 215 656T244 698Q270 724 324 740Q361 748 377 749Q379 749 390 749T408 750H428Q434 744 434 732Q434 719 431 716Q429 713 415 713Q362 710 332 689T296 647Q291 634 291 499V417Q291 370 288 353T271 314Q240 271 184 255L170 250L184 245Q202 239 220 230T262 196T290 137Q291 131 291 1Q291 -134 296 -147Q306 -174 339 -192T415 -213Q429 -213 431 -216Q434 -219 434 -231Z\"><\/path><path id=\"MJX-1195-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-1195-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1195-TEX-N-7D\" d=\"M65 731Q65 745 68 747T88 750Q171 750 216 725T279 670Q288 649 289 635T291 501Q292 362 293 357Q306 312 345 291T417 269Q428 269 431 266T434 250T431 234T417 231Q380 231 345 210T298 157Q293 143 292 121T291 -28V-79Q291 -134 285 -156T256 -198Q202 -250 89 -250Q71 -250 68 -247T65 -230Q65 -224 65 -223T66 -218T69 -214T77 -213Q91 -213 108 -210T146 -200T183 -177T207 -139Q208 -134 209 3L210 139Q223 196 280 230Q315 247 330 250Q305 257 280 270Q225 304 212 352L210 362L209 498Q208 635 207 640Q195 680 154 696T77 713Q68 713 67 716T65 731Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mo\"><use data-c=\"7B\" xlink:href=\"#MJX-1195-TEX-N-7B\"><\/use><\/g><g data-mml-node=\"msup\" transform=\"translate(500,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D719\" xlink:href=\"#MJX-1195-TEX-I-1D719\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(629,363) scale(0.707)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1195-TEX-I-1D44B\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1781.5,0)\"><use data-c=\"7D\" xlink:href=\"#MJX-1195-TEX-N-7D\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\{\\phi^X\\}<\/script> is a natural transformation from <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.277ex\" height=\"1.314ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -431 1006.6 581\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1196-TEX-I-1D70B\" d=\"M132 -11Q98 -11 98 22V33L111 61Q186 219 220 334L228 358H196Q158 358 142 355T103 336Q92 329 81 318T62 297T53 285Q51 284 38 284Q19 284 19 294Q19 300 38 329T93 391T164 429Q171 431 389 431Q549 431 553 430Q573 423 573 402Q573 371 541 360Q535 358 472 358H408L405 341Q393 269 393 222Q393 170 402 129T421 65T431 37Q431 20 417 5T381 -10Q370 -10 363 -7T347 17T331 77Q330 86 330 121Q330 170 339 226T357 318T367 358H269L268 354Q268 351 249 275T206 114T175 17Q164 -11 132 -11Z\"><\/path><path id=\"MJX-1196-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D70B\" xlink:href=\"#MJX-1196-TEX-I-1D70B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(603,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1196-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">\\pi_1<\/script> to <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.868ex\" height=\"1.885ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 1267.6 833\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.339ex;\"><defs><path id=\"MJX-1197-TEX-I-1D43B\" d=\"M228 637Q194 637 192 641Q191 643 191 649Q191 673 202 682Q204 683 219 683Q260 681 355 681Q389 681 418 681T463 682T483 682Q499 682 499 672Q499 670 497 658Q492 641 487 638H485Q483 638 480 638T473 638T464 637T455 637Q416 636 405 634T387 623Q384 619 355 500Q348 474 340 442T328 395L324 380Q324 378 469 378H614L615 381Q615 384 646 504Q674 619 674 627T617 637Q594 637 587 639T580 648Q580 650 582 660Q586 677 588 679T604 682Q609 682 646 681T740 680Q802 680 835 681T871 682Q888 682 888 672Q888 645 876 638H874Q872 638 869 638T862 638T853 637T844 637Q805 636 794 634T776 623Q773 618 704 340T634 58Q634 51 638 51Q646 48 692 46H723Q729 38 729 37T726 19Q722 6 716 0H701Q664 2 567 2Q533 2 504 2T458 2T437 1Q420 1 420 10Q420 15 423 24Q428 43 433 45Q437 46 448 46H454Q481 46 514 49Q520 50 522 50T528 55T534 64T540 82T547 110T558 153Q565 181 569 198Q602 330 602 331T457 332H312L279 197Q245 63 245 58Q245 51 253 49T303 46H334Q340 38 340 37T337 19Q333 6 327 0H312Q275 2 178 2Q144 2 115 2T69 2T48 1Q31 1 31 10Q31 12 34 24Q39 43 44 45Q48 46 59 46H65Q92 46 125 49Q139 52 144 61Q147 65 216 339T285 628Q285 635 228 637Z\"><\/path><path id=\"MJX-1197-TEX-N-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-1197-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-1197-TEX-N-31\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">H_1<\/script>; that is the diagram<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n505\" cid=\"n505\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-tag-after=\"0\" data-math-labels=\"[]\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32.297ex\" height=\"15.213ex\" role=\"img\" 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xlink:href=\"#MJX-76-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(609,-150) scale(0.707)\"><use data-c=\"2217\" xlink:href=\"#MJX-76-TEX-N-2217\"><\/use><\/g><\/g><\/g><\/g><g stroke=\"currentColor\" fill=\"currentColor\" data-x=\"8.23333008588991\" data-y=\"4.35\" data-xypic-id=\"9\" transform=\"translate(10594.9,-4100)\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"mstyle\"><g data-mml-node=\"TeXAtom\" data-mjx-texclass=\"ORD\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D43B\" xlink:href=\"#MJX-76-TEX-I-1D43B\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(864,-150) scale(0.707)\"><use data-c=\"31\" xlink:href=\"#MJX-76-TEX-N-31\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(1267.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-76-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1656.6,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-76-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2419.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-76-TEX-N-29\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><\/div><\/div>\n<p>commutes, for each continuous map <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20.273ex\" height=\"2.262ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -750 8960.6 1000\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.566ex;\"><defs><path id=\"MJX-1198-TEX-I-210E\" d=\"M137 683Q138 683 209 688T282 694Q294 694 294 685Q294 674 258 534Q220 386 220 383Q220 381 227 388Q288 442 357 442Q411 442 444 415T478 336Q478 285 440 178T402 50Q403 36 407 31T422 26Q450 26 474 56T513 138Q516 149 519 151T535 153Q555 153 555 145Q555 144 551 130Q535 71 500 33Q466 -10 419 -10H414Q367 -10 346 17T325 74Q325 90 361 192T398 345Q398 404 354 404H349Q266 404 205 306L198 293L164 158Q132 28 127 16Q114 -11 83 -11Q69 -11 59 -2T48 16Q48 30 121 320L195 616Q195 629 188 632T149 637H128Q122 643 122 645T124 664Q129 683 137 683Z\"><\/path><path id=\"MJX-1198-TEX-N-3A\" d=\"M78 370Q78 394 95 412T138 430Q162 430 180 414T199 371Q199 346 182 328T139 310T96 327T78 370ZM78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z\"><\/path><path id=\"MJX-1198-TEX-N-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path id=\"MJX-1198-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path id=\"MJX-1198-TEX-N-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path id=\"MJX-1198-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1198-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path id=\"MJX-1198-TEX-N-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path id=\"MJX-1198-TEX-N-2192\" d=\"M56 237T56 250T70 270H835Q719 357 692 493Q692 494 692 496T691 499Q691 511 708 511H711Q720 511 723 510T729 506T732 497T735 481T743 456Q765 389 816 336T935 261Q944 258 944 250Q944 244 939 241T915 231T877 212Q836 186 806 152T761 85T740 35T732 4Q730 -6 727 -8T711 -11Q691 -11 691 0Q691 7 696 25Q728 151 835 230H70Q56 237 56 250Z\"><\/path><path id=\"MJX-1198-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><path id=\"MJX-1198-TEX-I-1D466\" d=\"M21 287Q21 301 36 335T84 406T158 442Q199 442 224 419T250 355Q248 336 247 334Q247 331 231 288T198 191T182 105Q182 62 196 45T238 27Q261 27 281 38T312 61T339 94Q339 95 344 114T358 173T377 247Q415 397 419 404Q432 431 462 431Q475 431 483 424T494 412T496 403Q496 390 447 193T391 -23Q363 -106 294 -155T156 -205Q111 -205 77 -183T43 -117Q43 -95 50 -80T69 -58T89 -48T106 -45Q150 -45 150 -87Q150 -107 138 -122T115 -142T102 -147L99 -148Q101 -153 118 -160T152 -167H160Q177 -167 186 -165Q219 -156 247 -127T290 -65T313 -9T321 21L315 17Q309 13 296 6T270 -6Q250 -11 231 -11Q185 -11 150 11T104 82Q103 89 103 113Q103 170 138 262T173 379Q173 380 173 381Q173 390 173 393T169 400T158 404H154Q131 404 112 385T82 344T65 302T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"210E\" xlink:href=\"#MJX-1198-TEX-I-210E\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(853.8,0)\"><use data-c=\"3A\" xlink:href=\"#MJX-1198-TEX-N-3A\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(1409.6,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1198-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(1798.6,0)\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1198-TEX-I-1D44B\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(2650.6,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1198-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(3095.2,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1198-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1198-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(4103.8,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1198-TEX-N-29\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(4770.6,0)\"><use data-c=\"2192\" xlink:href=\"#MJX-1198-TEX-N-2192\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(6048.3,0)\"><use data-c=\"28\" xlink:href=\"#MJX-1198-TEX-N-28\"><\/use><\/g><g data-mml-node=\"mi\" transform=\"translate(6437.3,0)\"><use data-c=\"1D44C\" xlink:href=\"#MJX-1198-TEX-I-1D44C\"><\/use><\/g><g data-mml-node=\"mo\" transform=\"translate(7200.3,0)\"><use data-c=\"2C\" xlink:href=\"#MJX-1198-TEX-N-2C\"><\/use><\/g><g data-mml-node=\"msub\" transform=\"translate(7645,0)\"><g data-mml-node=\"mi\"><use data-c=\"1D466\" xlink:href=\"#MJX-1198-TEX-I-1D466\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(523,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1198-TEX-N-30\"><\/use><\/g><\/g><g data-mml-node=\"mo\" transform=\"translate(8571.6,0)\"><use data-c=\"29\" xlink:href=\"#MJX-1198-TEX-N-29\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">h:(X,x_0)\\to (Y,y_0)<\/script>.<\/p>\n<p><strong>Proof.<\/strong><\/p>\n<p>If <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.244ex\" height=\"2.059ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -705 550 910\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.464ex;\"><defs><path id=\"MJX-1199-TEX-I-1D453\" d=\"M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D453\" xlink:href=\"#MJX-1199-TEX-I-1D453\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">f<\/script> be a loop in <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"1.928ex\" height=\"1.545ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -683 852 683\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: 0px;\"><defs><path id=\"MJX-1200-TEX-I-1D44B\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"mi\"><use data-c=\"1D44B\" xlink:href=\"#MJX-1200-TEX-I-1D44B\"><\/use><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">X<\/script> with base point <mjx-container class=\"MathJax\" jax=\"SVG\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"2.282ex\" height=\"1.375ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -442 1008.6 607.6\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -0.375ex;\"><defs><path id=\"MJX-1201-TEX-I-1D465\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z\"><\/path><path id=\"MJX-1201-TEX-N-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"scale(1,-1)\"><g data-mml-node=\"math\"><g data-mml-node=\"msub\"><g data-mml-node=\"mi\"><use data-c=\"1D465\" xlink:href=\"#MJX-1201-TEX-I-1D465\"><\/use><\/g><g data-mml-node=\"mn\" transform=\"translate(605,-150) scale(0.707)\"><use data-c=\"30\" xlink:href=\"#MJX-1201-TEX-N-30\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/mjx-container><script type=\"math\/tex\">x_0<\/script>, then<\/p>\n<div contenteditable=\"false\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock md-rawblock-on-edit md-focus\" id=\"mathjax-n509\" cid=\"n509\" mdtype=\"math_block\" data-math-tag-before=\"0\" data-math-labels=\"[]\" data-math-tag-after=\"0\"><div class=\"md-mathblock-panel md-rawblock-panel\" contenteditable=\"false\"><div contenteditable=\"false\" class=\"md-rawblock-control md-rawblock-before\">$$\n\t\t\t\t\t<span class=\"md-math-tag-input ty-input ty-input-before\" tabindex=\"-1\" contenteditable=\"plaintext-only\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"md-rawblock-control md-rawblock-input md-mathblock-input\">\n\t\t\t\t<\/div>\n\t\t\t\t<div contenteditable=\"false\" class=\"md-rawblock-control md-rawblock-after\">$$\n\t\t\t\t\t<span class=\"md-math-tag-input ty-input ty-input-after\" tabindex=\"-1\" contenteditable=\"plaintext-only\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"code-tooltip\" contenteditable=\"false\">\n\t\t\t\t\t<div class=\"md-mathjax-preview\" contenteditable=\"false\"><mjx-container class=\"MathJax\" jax=\"SVG\" display=\"true\" style=\"position: relative;\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"25.112ex\" height=\"11.746ex\" role=\"img\" focusable=\"false\" viewBox=\"0 -2846 11099.3 5191.9\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" style=\"vertical-align: -5.308ex;\"><defs><path id=\"MJX-77-TEX-I-1D719\" d=\"M409 688Q413 694 421 694H429H442Q448 688 448 686Q448 679 418 563Q411 535 404 504T392 458L388 442Q388 441 397 441T429 435T477 418Q521 397 550 357T579 260T548 151T471 65T374 11T279 -10H275L251 -105Q245 -128 238 -160Q230 -192 227 -198T215 -205H209Q189 -205 189 -198Q189 -193 211 -103L234 -11Q234 -10 226 -10Q221 -10 206 -8T161 6T107 36T62 89T43 171Q43 231 76 284T157 370T254 422T342 441Q347 441 348 445L378 567Q409 686 409 688ZM122 150Q122 116 134 91T167 53T203 35T237 27H244L337 404Q333 404 326 403T297 395T255 379T211 350T170 304Q152 276 137 237Q122 191 122 150ZM500 282Q500 320 484 347T444 385T405 400T381 404H378L332 217L284 29Q284 27 285 27Q293 27 317 33T357 47Q400 66 431 100T475 170T494 234T500 282Z\"><\/path><path id=\"MJX-77-TEX-I-1D44C\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 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