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Link (simplicial complex)

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The link of a vertex of a tetrahedron is a triangle – the three vertices of the link corresponds to the three edges incident to the vertex, and the three edges of the link correspond to the faces incident to the vertex. In this example, the link can be visualized by cutting off the vertex with a
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is the triangle at the base of the tetrahedron. This is because, for each edge of that triangle, the join of v with the edge is a triangle (one of the three triangles at the sides of the tetrahedron); and the join of
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Another example is illustrated below. There is a two-dimensional simplicial complex. At the left, a vertex is marked in yellow. At the right, the link of that vertex is marked in green.
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An example is illustrated below. There is a two-dimensional simplicial complex. At the left, a vertex is marked in yellow. At the right, the star of that vertex is marked in green.
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of a vertex in a graph. The link of a vertex encodes information about the local structure of the complex at the vertex.
2145:{\textstyle \operatorname {St} (\sigma ,X):=\{\tau \in X:\exists \rho \in X:\tau ,\sigma {\text{ are faces of }}\rho \}} 1902: 1759: 1098: 741: 433: 249: 44: 2503: 1301: 1596: 1292:
plane; formally, intersecting the tetrahedron with a plane near the vertex – the resulting cross-section is the link.
843: 56: 2336:{\textstyle \operatorname {Lk} (\sigma ,X)=\{\tau \in \operatorname {St} (\sigma ,X):\tau \cap \sigma =\emptyset \}} 1087:{\textstyle \operatorname {Lk} (\sigma ,X):=\{\tau \in X:~\tau \cap \sigma =\emptyset ,~\tau \cup \sigma \in X\}} 1940: 1663: 1388: 1335: 1136: 879: 776: 1765: 480: 255: 117: 2557: 795: 1873: 1727: 1529: 969: 1555: 823: 544: 207: 181: 2635: 1200: 943: 2672: 2647: 2611: 2565: 2228: 1911: 1605: 1107: 633: 2603: 1978: 1701: 1174: 917: 680:
As an example, suppose v is the top vertex of the tetrahedron at the left. Then the link of
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is downward-closed, and therefore it is a simplicial complex too; it is a sub-complex of
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So the link is a subset of the star. The star and link are related as follows:
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The definition of a link can be extended from a single vertex to any face.
819: 27: 2442:{\textstyle \operatorname {St} (v,X)=v\star \operatorname {Lk} (v,X)} 2556:
Bryant, John L. (2001-01-01), Daverman, R. J.; Sher, R. B. (eds.),
690: 26: 2191:{\textstyle \{\rho \in X:\sigma {\text{ is a face of }}\rho \}} 791: 381: 401:{\textstyle \operatorname {Lk} (v,X)={\mathcal {N}}(v)=} 2479: 2455: 2387: 2352: 2257: 2231: 2204: 2158: 2067: 2047: 2027: 2007: 1981: 1943: 1914: 1883: 1858: 1838: 1806: 1768: 1730: 1704: 1666: 1634: 1608: 1532: 1488: 1391: 1338: 1269: 1249: 1229: 1203: 1177: 1139: 1110: 1002: 972: 946: 920: 882: 855: 711: 695:
The link of a vertex of a tetrahedron is the triangle.
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with the triangle itself is the entire tetrahedron.
43:in a simplicial complex is a generalization of the 2485: 2461: 2441: 2373: 2335: 2243: 2210: 2190: 2144: 2053: 2033: 2013: 1993: 1967: 1926: 1889: 1864: 1844: 1824: 1792: 1742: 1716: 1690: 1649: 1620: 1571: 1544: 1518: 1474: 1415: 1362: 1275: 1255: 1235: 1215: 1189: 1163: 1122: 1086: 984: 958: 932: 906: 861: 830:; it is an analog to a sphere centered at a point. 732: 668: 648: 619: 599: 579: 559: 533: 507: 466: 420: 400: 340: 308: 282: 228: 196: 170: 144: 103: 74: 2152:. In other words, it is the closure of the set 2564:, Amsterdam: North-Holland, pp. 219–259, 1588:A concept closely related to the link is the 8: 2330: 2282: 2185: 2159: 2139: 2092: 1819: 1807: 1469: 1443: 1081: 1027: 335: 323: 223: 217: 1968:{\textstyle \operatorname {St} (\sigma ,X)} 1691:{\textstyle \operatorname {St} (\sigma ,X)} 1416:{\textstyle \operatorname {Lk} (\sigma ,X)} 1363:{\textstyle \operatorname {Lk} (\sigma ,X)} 1164:{\textstyle \operatorname {Lk} (\sigma ,X)} 907:{\textstyle \operatorname {Lk} (\sigma ,X)} 2599:Introduction to Piecewise-Linear Topology 2478: 2454: 2386: 2351: 2256: 2230: 2203: 2177: 2157: 2131: 2066: 2046: 2026: 2006: 1980: 1942: 1913: 1882: 1857: 1837: 1805: 1767: 1729: 1703: 1665: 1633: 1607: 1563: 1557: 1531: 1487: 1455: 1434: 1428: 1390: 1337: 1268: 1248: 1228: 1202: 1176: 1138: 1109: 1001: 971: 945: 919: 881: 854: 710: 661: 635: 612: 592: 572: 546: 520: 482: 444: 413: 380: 379: 353: 321: 295: 257: 209: 183: 157: 119: 87: 67: 755:constructed as follows. The vertices of 2640:Metric spaces of non-positive curvature 2558:"Chapter 5 - Piecewise Linear Topology" 2543: 2499: 1758:is a 1-dimensional complex (that is: a 1297: 1223:are disjoint and there is a simplex in 248:is a 1-dimensional complex (that is: a 1793:{\textstyle \operatorname {St} (v,X)} 508:{\textstyle \operatorname {Lk} (v,X)} 283:{\textstyle \operatorname {Lk} (v,X)} 145:{\textstyle \operatorname {Lk} (v,X)} 7: 2588: 2586: 2551: 2549: 2547: 2327: 2107: 1057: 701:An alternative definition is: the 348:is an edge in the graph; that is, 25: 2502: 2001:such that there is a simplex in 1300: 2198:-- the set of simplices having 1975:is a set containing every face 1754:. In the special case in which 1698:is a set containing every face 1171:is a set containing every face 914:is a set containing every face 515:is a set containing every face 152:is a set containing every face 2596:; Sanderson, Brian J. (1972). 2562:Handbook of Geometric Topology 2436: 2424: 2406: 2394: 2368: 2362: 2309: 2297: 2276: 2264: 2086: 2074: 1962: 1950: 1787: 1775: 1743:{\textstyle \tau \cup \sigma } 1685: 1673: 1644: 1638: 1545:{\textstyle \tau \cup \sigma } 1513: 1501: 1410: 1398: 1357: 1345: 1158: 1146: 1021: 1009: 985:{\textstyle \tau \cup \sigma } 901: 889: 727: 721: 502: 490: 461: 455: 392: 386: 373: 361: 277: 265: 139: 127: 98: 92: 1: 627:as a face. Equivalently, the 244:In the special case in which 1903:geometric simplicial complex 1099:geometric simplicial complex 560:{\textstyle v\not \in \tau } 434:geometric simplicial complex 229:{\textstyle \tau \cup \{v\}} 197:{\textstyle v\not \in \tau } 1597:abstract simplicial complex 1572:{\displaystyle X_{\sigma }} 1328:For any simplicial complex 844:abstract simplicial complex 826:of small radius centred at 57:abstract simplicial complex 2689: 1381:is simplicial, there is a 1216:{\textstyle \sigma ,\tau } 959:{\textstyle \sigma ,\tau } 567:and there is a simplex in 2608:10.1007/978-3-642-81735-9 2244:{\textstyle \sigma \in X} 1927:{\textstyle \sigma \in X} 1621:{\textstyle \sigma \in X} 1123:{\textstyle \sigma \in X} 649:{\textstyle v\star \tau } 18:Star (simplicial complex) 2179: is a face of  2133: are faces of  2449:, that is, the star of 1994:{\textstyle \tau \in X} 1717:{\textstyle \tau \in X} 1190:{\textstyle \tau \in X} 933:{\textstyle \tau \in X} 534:{\textstyle \tau \in X} 171:{\textstyle \tau \in X} 2487: 2463: 2443: 2375: 2374:{\textstyle v\in V(X)} 2337: 2245: 2212: 2192: 2146: 2055: 2035: 2015: 1995: 1969: 1928: 1891: 1866: 1852:that are neighbors of 1846: 1826: 1794: 1744: 1718: 1692: 1651: 1622: 1573: 1546: 1520: 1476: 1417: 1364: 1277: 1257: 1237: 1217: 1191: 1165: 1124: 1088: 986: 960: 934: 908: 863: 798:to a common 2-cell at 734: 733:{\textstyle v\in V(X)} 696: 670: 650: 621: 601: 581: 561: 535: 509: 468: 467:{\textstyle v\in V(X)} 422: 402: 342: 310: 290:contains all vertices 284: 230: 198: 172: 146: 105: 76: 36: 2488: 2464: 2444: 2376: 2338: 2246: 2213: 2193: 2147: 2056: 2036: 2016: 1996: 1970: 1929: 1892: 1867: 1847: 1827: 1795: 1745: 1719: 1693: 1652: 1623: 1574: 1547: 1521: 1477: 1457: such that  1418: 1365: 1278: 1258: 1238: 1218: 1192: 1166: 1125: 1089: 987: 961: 935: 909: 864: 775:. Two such edges are 735: 694: 671: 651: 622: 602: 582: 562: 536: 510: 469: 423: 403: 343: 311: 285: 231: 199: 173: 147: 106: 77: 30: 2477: 2453: 2385: 2350: 2255: 2229: 2211:{\textstyle \sigma } 2202: 2156: 2065: 2045: 2034:{\textstyle \sigma } 2025: 2005: 1979: 1941: 1912: 1881: 1874:graph-theoretic star 1856: 1836: 1825:{\textstyle \{u,v\}} 1804: 1766: 1728: 1702: 1664: 1632: 1606: 1556: 1530: 1486: 1427: 1389: 1336: 1267: 1256:{\textstyle \sigma } 1247: 1227: 1201: 1175: 1137: 1108: 1000: 970: 944: 918: 880: 862:{\textstyle \sigma } 853: 709: 660: 634: 611: 591: 571: 545: 519: 481: 443: 412: 408:the neighborhood of 352: 341:{\textstyle \{u,v\}} 320: 309:{\textstyle u\neq v} 294: 256: 208: 182: 156: 118: 86: 66: 1872:. That is, it is a 1800:contains all edges 818:is often given the 2483: 2459: 2439: 2371: 2333: 2241: 2208: 2188: 2142: 2054:{\textstyle \tau } 2051: 2031: 2011: 1991: 1965: 1924: 1887: 1862: 1842: 1822: 1790: 1740: 1714: 1688: 1647: 1618: 1569: 1542: 1516: 1472: 1413: 1360: 1276:{\textstyle \tau } 1273: 1253: 1233: 1213: 1187: 1161: 1120: 1084: 982: 956: 930: 904: 859: 730: 697: 666: 646: 620:{\textstyle \tau } 617: 597: 577: 557: 531: 505: 464: 418: 398: 338: 306: 280: 226: 194: 168: 142: 101: 72: 37: 2617:978-3-540-11102-3 2571:978-0-444-82432-5 2180: 2134: 1832:for all vertices 1650:{\textstyle V(X)} 1458: 1065: 1044: 966:are disjoint and 767:are the edges of 104:{\textstyle V(X)} 16:(Redirected from 2680: 2657: 2656: 2636:Haefliger, André 2628: 2622: 2621: 2594:Rourke, Colin P. 2590: 2581: 2580: 2579: 2578: 2553: 2518: 2512: 2506: 2492: 2490: 2489: 2484: 2468: 2466: 2465: 2460: 2448: 2446: 2445: 2440: 2380: 2378: 2377: 2372: 2342: 2340: 2339: 2334: 2250: 2248: 2247: 2242: 2217: 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910: 905: 872: 868: 866: 865: 860: 848: 829: 817: 801: 790: 774: 770: 766: 754: 739: 737: 736: 731: 675: 673: 672: 667: 655: 653: 652: 647: 626: 624: 623: 618: 607:as a vertex and 606: 604: 603: 598: 586: 584: 583: 578: 566: 564: 563: 558: 540: 538: 537: 532: 514: 512: 511: 506: 473: 471: 470: 465: 438: 427: 425: 424: 419: 407: 405: 404: 399: 385: 384: 347: 345: 344: 339: 315: 313: 312: 307: 289: 287: 286: 281: 247: 239: 235: 233: 232: 227: 203: 201: 200: 195: 177: 175: 174: 169: 151: 149: 148: 143: 110: 108: 107: 102: 81: 79: 78: 73: 61: 51:Link of a vertex 21: 2688: 2687: 2683: 2682: 2681: 2679: 2678: 2677: 2663: 2662: 2661: 2660: 2654: 2632:Bridson, Martin 2630: 2629: 2625: 2618: 2592: 2591: 2584: 2576: 2574: 2572: 2555: 2554: 2545: 2540: 2527: 2520: 2514: 2510: 2507: 2475: 2474: 2473:of its link at 2451: 2450: 2383: 2382: 2348: 2347: 2253: 2252: 2227: 2226: 2200: 2199: 2154: 2153: 2063: 2062: 2043: 2042: 2023: 2022: 2003: 2002: 1977: 1976: 1939: 1938: 1910: 1909: 1905: 1879: 1878: 1854: 1853: 1834: 1833: 1802: 1801: 1764: 1763: 1755: 1751: 1726: 1725: 1700: 1699: 1662: 1661: 1630: 1629: 1604: 1603: 1599: 1586: 1559: 1554: 1553: 1528: 1527: 1526:corresponds to 1484: 1483: 1430: 1425: 1424: 1387: 1386: 1383:set isomorphism 1378: 1371: 1334: 1333: 1329: 1325: 1318: 1312: 1308: 1305: 1289: 1265: 1264: 1245: 1244: 1225: 1224: 1199: 1198: 1173: 1172: 1135: 1134: 1106: 1105: 1101: 998: 997: 993: 968: 967: 942: 941: 916: 915: 878: 877: 870: 851: 850: 846: 837: 827: 807: 799: 780: 772: 768: 756: 744: 707: 706: 658: 657: 632: 631: 609: 608: 589: 588: 569: 568: 543: 542: 517: 516: 479: 478: 441: 440: 436: 410: 409: 350: 349: 318: 317: 292: 291: 254: 253: 245: 237: 206: 205: 180: 179: 154: 153: 116: 115: 84: 83: 64: 63: 59: 53: 35:is a 2-complex. 23: 22: 15: 12: 11: 5: 2686: 2684: 2676: 2675: 2665: 2664: 2659: 2658: 2652: 2623: 2616: 2582: 2570: 2542: 2541: 2539: 2536: 2535: 2534: 2526: 2523: 2522: 2521: 2508: 2501: 2495: 2494: 2486:{\textstyle v} 2482: 2462:{\textstyle v} 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1500: 1497: 1494: 1491: 1471: 1468: 1465: 1462: 1454: 1451: 1448: 1445: 1442: 1437: 1433: 1412: 1409: 1406: 1403: 1400: 1397: 1394: 1375: 1359: 1356: 1353: 1350: 1347: 1344: 1341: 1324: 1321: 1320: 1319: 1306: 1299: 1288: 1285: 1272: 1252: 1243:that has both 1236:{\textstyle X} 1232: 1212: 1209: 1206: 1186: 1183: 1180: 1160: 1157: 1154: 1151: 1148: 1145: 1142: 1119: 1116: 1113: 1083: 1080: 1077: 1074: 1071: 1068: 1062: 1059: 1056: 1053: 1050: 1047: 1041: 1038: 1035: 1032: 1029: 1026: 1023: 1020: 1017: 1014: 1011: 1008: 1005: 981: 978: 975: 955: 952: 949: 929: 926: 923: 903: 900: 897: 894: 891: 888: 885: 858: 836: 835:Link of a face 833: 832: 831: 729: 726: 723: 720: 717: 714: 699: 698: 669:{\textstyle X} 665: 645: 642: 639: 616: 600:{\textstyle v} 596: 580:{\textstyle X} 576: 556: 553: 550: 530: 527: 524: 504: 501: 498: 495: 492: 489: 486: 463: 460: 457: 454: 451: 448: 430: 429: 421:{\textstyle v} 417: 397: 394: 391: 388: 383: 378: 375: 372: 369: 366: 363: 360: 357: 337: 334: 331: 328: 325: 305: 302: 299: 279: 276: 273: 270: 267: 264: 261: 225: 222: 219: 216: 213: 193: 190: 187: 167: 164: 161: 141: 138: 135: 132: 129: 126: 123: 100: 97: 94: 91: 75:{\textstyle v} 71: 52: 49: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2685: 2674: 2671: 2670: 2668: 2655: 2653:3-540-64324-9 2649: 2645: 2641: 2637: 2633: 2627: 2624: 2619: 2613: 2609: 2605: 2601: 2600: 2595: 2589: 2587: 2583: 2573: 2567: 2563: 2559: 2552: 2550: 2548: 2544: 2537: 2532: 2531:Vertex figure 2529: 2528: 2524: 2517: 2505: 2500: 2498: 2480: 2472: 2456: 2433: 2430: 2427: 2421: 2418: 2415: 2412: 2409: 2403: 2400: 2397: 2391: 2388: 2365: 2359: 2356: 2353: 2345: 2324: 2321: 2318: 2315: 2312: 2306: 2303: 2300: 2294: 2291: 2288: 2285: 2279: 2273: 2270: 2267: 2261: 2258: 2238: 2235: 2232: 2224: 2223: 2222: 2219: 2205: 2182: 2174: 2171: 2168: 2165: 2162: 2136: 2128: 2125: 2122: 2119: 2116: 2113: 2110: 2104: 2101: 2098: 2095: 2089: 2083: 2080: 2077: 2071: 2068: 2048: 2028: 2008: 1988: 1985: 1982: 1959: 1956: 1953: 1947: 1944: 1937: 1921: 1918: 1915: 1908:and any face 1904: 1899: 1897: 1884: 1875: 1859: 1839: 1816: 1813: 1810: 1784: 1781: 1778: 1772: 1769: 1761: 1750:is a face of 1737: 1734: 1731: 1711: 1708: 1705: 1682: 1679: 1676: 1670: 1667: 1660: 1641: 1635: 1615: 1612: 1609: 1602:and any face 1598: 1593: 1591: 1584:Link and star 1583: 1564: 1560: 1539: 1536: 1533: 1510: 1507: 1504: 1498: 1495: 1492: 1489: 1466: 1463: 1460: 1452: 1449: 1446: 1440: 1435: 1431: 1407: 1404: 1401: 1395: 1392: 1384: 1376: 1354: 1351: 1348: 1342: 1339: 1332:, every link 1327: 1326: 1322: 1315: 1303: 1298: 1296: 1293: 1286: 1284: 1270: 1250: 1230: 1210: 1207: 1204: 1184: 1181: 1178: 1155: 1152: 1149: 1143: 1140: 1133: 1117: 1114: 1111: 1104:and any face 1100: 1095: 1078: 1075: 1072: 1069: 1066: 1060: 1054: 1051: 1048: 1045: 1039: 1036: 1033: 1030: 1024: 1018: 1015: 1012: 1006: 1003: 992:is a face of 979: 976: 973: 953: 950: 947: 927: 924: 921: 898: 895: 892: 886: 883: 876: 856: 849:and any face 845: 840: 834: 825: 821: 815: 811: 805: 804: 803: 797: 793: 788: 784: 778: 764: 760: 752: 748: 743: 724: 718: 715: 712: 704: 693: 688: 683: 679: 678: 677: 663: 656:is a face in 643: 640: 637: 630: 614: 594: 574: 554: 551: 548: 528: 525: 522: 499: 496: 493: 487: 484: 477: 458: 452: 449: 446: 435: 428:in the graph. 415: 395: 389: 376: 370: 367: 364: 358: 355: 332: 329: 326: 303: 300: 297: 274: 271: 268: 262: 259: 251: 243: 242: 241: 236:is a face of 220: 214: 211: 191: 188: 185: 165: 162: 159: 136: 133: 130: 124: 121: 114: 95: 89: 69: 58: 50: 48: 46: 42: 34: 29: 19: 2639: 2626: 2598: 2575:, retrieved 2561: 2515: 2496: 2220: 2021:having both 1935: 1900: 1877: 1876:centered at 1658: 1594: 1589: 1587: 1423:and the set 1313: 1294: 1290: 1131: 1096: 874: 841: 838: 813: 809: 786: 782: 771:incident to 762: 758: 750: 746: 705:of a vertex 702: 700: 686: 681: 475: 431: 112: 82:a vertex in 54: 45:neighborhood 40: 38: 2218:as a face. 33:tetrahedron 2577:2022-11-15 2538:References 2061:as faces: 1724:such that 1323:Properties 1283:as faces. 1197:such that 940:such that 806:The graph 541:such that 316:such that 178:such that 2422:⁡ 2416:⋆ 2392:⁡ 2357:∈ 2328:∅ 2322:σ 2319:∩ 2316:τ 2301:σ 2295:⁡ 2289:∈ 2286:τ 2268:σ 2262:⁡ 2236:∈ 2233:σ 2206:σ 2183:ρ 2175:σ 2166:∈ 2163:ρ 2137:ρ 2129:σ 2123:τ 2114:∈ 2111:ρ 2108:∃ 2099:∈ 2096:τ 2078:σ 2072:⁡ 2049:τ 2029:σ 1986:∈ 1983:τ 1954:σ 1948:⁡ 1919:∈ 1916:σ 1773:⁡ 1738:σ 1735:∪ 1732:τ 1709:∈ 1706:τ 1677:σ 1671:⁡ 1613:∈ 1610:σ 1595:Given an 1565:σ 1540:σ 1537:∪ 1534:τ 1505:σ 1499:⁡ 1493:∈ 1490:τ 1467:ρ 1464:⊆ 1461:σ 1450:∈ 1447:ρ 1436:σ 1402:σ 1396:⁡ 1349:σ 1343:⁡ 1271:τ 1251:σ 1211:τ 1205:σ 1182:∈ 1179:τ 1150:σ 1144:⁡ 1115:∈ 1112:σ 1076:∈ 1073:σ 1070:∪ 1067:τ 1058:∅ 1052:σ 1049:∩ 1046:τ 1034:∈ 1031:τ 1013:σ 1007:⁡ 980:σ 977:∪ 974:τ 954:τ 948:σ 925:∈ 922:τ 893:σ 887:⁡ 857:σ 842:Given an 794:they are 716:∈ 644:τ 641:⋆ 615:τ 587:that has 555:τ 526:∈ 523:τ 488:⁡ 450:∈ 359:⁡ 301:≠ 263:⁡ 215:∪ 212:τ 192:τ 163:∈ 160:τ 125:⁡ 55:Given an 2673:Geometry 2667:Category 2644:Springer 2638:(1999), 2525:See also 2513:and its 2346:For any 2225:For any 1901:Given a 1482:: every 1385:between 1377:Because 1311:and its 1287:Examples 1097:Given a 820:topology 796:incident 777:adjacent 552:∉ 432:Given a 189:∉ 2469:is the 740:is the 2650:  2614:  2568:  2511:vertex 1934:, its 1657:, its 1309:vertex 1130:, its 1064:  1043:  873:, its 474:, its 111:, its 1760:graph 822:of a 742:graph 250:graph 2648:ISBN 2612:ISBN 2566:ISBN 2516:star 2471:cone 2041:and 1936:star 1659:star 1590:star 1314:link 1263:and 1132:link 875:link 824:ball 703:link 629:join 476:link 439:and 240:. 204:and 113:link 62:and 41:link 39:The 31:The 2604:doi 1898:. 1762:), 1592:. 1094:. 869:of 808:Lk( 802:. 792:iff 781:Lk( 779:in 757:Lk( 745:Lk( 252:), 2669:: 2646:, 2642:, 2634:; 2610:. 2602:. 2585:^ 2560:, 2546:^ 2509:A 2419:Lk 2389:St 2381:, 2343:. 2292:St 2259:Lk 2251:, 2090::= 2069:St 1945:St 1770:St 1668:St 1496:Lk 1441::= 1393:Lk 1340:Lk 1307:A 1141:Lk 1025::= 1004:Lk 996:: 884:Lk 812:, 785:, 761:, 749:, 676:. 485:Lk 356:Lk 260:Lk 122:Lk 2620:. 2606:: 2519:. 2493:. 2481:v 2457:v 2437:) 2434:X 2431:, 2428:v 2425:( 2413:v 2410:= 2407:) 2404:X 2401:, 2398:v 2395:( 2369:) 2366:X 2363:( 2360:V 2354:v 2331:} 2325:= 2313:: 2310:) 2307:X 2304:, 2298:( 2283:{ 2280:= 2277:) 2274:X 2271:, 2265:( 2239:X 2186:} 2172:: 2169:X 2160:{ 2140:} 2126:, 2120:: 2117:X 2105:: 2102:X 2093:{ 2087:) 2084:X 2081:, 2075:( 2009:X 1989:X 1963:) 1960:X 1957:, 1951:( 1922:X 1906:X 1885:u 1860:v 1840:u 1820:} 1817:v 1814:, 1811:u 1808:{ 1788:) 1785:X 1782:, 1779:v 1776:( 1756:X 1752:X 1712:X 1686:) 1683:X 1680:, 1674:( 1645:) 1642:X 1639:( 1636:V 1628:, 1616:X 1600:X 1579:. 1561:X 1514:) 1511:X 1508:, 1502:( 1470:} 1453:X 1444:{ 1432:X 1411:) 1408:X 1405:, 1399:( 1379:X 1374:. 1372:X 1358:) 1355:X 1352:, 1346:( 1330:X 1317:. 1231:X 1208:, 1185:X 1159:) 1156:X 1153:, 1147:( 1118:X 1102:X 1082:} 1079:X 1061:, 1055:= 1040:: 1037:X 1028:{ 1022:) 1019:X 1016:, 1010:( 994:X 951:, 928:X 902:) 899:X 896:, 890:( 871:X 847:X 828:v 816:) 814:X 810:v 800:v 789:) 787:X 783:v 773:v 769:X 765:) 763:X 759:v 753:) 751:X 747:v 728:) 725:X 722:( 719:V 713:v 687:v 682:v 664:X 638:v 595:v 575:X 549:v 529:X 503:) 500:X 497:, 494:v 491:( 462:) 459:X 456:( 453:V 447:v 437:X 416:v 396:= 393:) 390:v 387:( 382:N 377:= 374:) 371:X 368:, 365:v 362:( 336:} 333:v 330:, 327:u 324:{ 304:v 298:u 278:) 275:X 272:, 269:v 266:( 246:X 238:X 224:} 221:v 218:{ 186:v 166:X 140:) 137:X 134:, 131:v 128:( 99:) 96:X 93:( 90:V 70:v 60:X 20:)

Index

Star (simplicial complex)

tetrahedron
neighborhood
abstract simplicial complex
graph
geometric simplicial complex
join

graph
adjacent
iff
incident
topology
ball
abstract simplicial complex
geometric simplicial complex
A vertex and its link.
set isomorphism
abstract simplicial complex
graph
graph-theoretic star
geometric simplicial complex
cone
A vertex and its star.
Vertex figure



"Chapter 5 - Piecewise Linear Topology"

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