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Low-dimensional topology

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1875: 1658: 1896: 1864: 1933: 1906: 1886: 31: 970:. In dimension four, in marked contrast with lower dimensions, topological and smooth manifolds are quite different. There exist some topological 4-manifolds that admit no smooth structure and even if there exists a smooth structure it need not be unique (i.e. there are smooth 4-manifolds that are 564:
Phenomena in three dimensions can be strikingly different from phenomena in other dimensions, and so there is a prevalence of very specialized techniques that do not generalize to dimensions greater than three. This special role has led to the discovery of close connections to a diversity of other
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There are compact 4-dimensional topological manifolds that are not homeomorphic to any simplicial complex. In dimension at least 5 the existence of topological manifolds not homeomorphic to a simplicial complex was an open problem. In 2013, Ciprian Manolescu posted a preprint on the ArXiv showing
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Its thick-thin decomposition has a thin part consisting of tubular neighborhoods of closed geodesics and/or ends that are the product of a Euclidean surface and the closed half-ray. The manifold is of finite volume if and only if its thick part is compact. In this case, the ends are of the form
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There are several fundamental theorems about manifolds that can be proved by low-dimensional methods in dimensions at most 3, and by completely different high-dimensional methods in dimension at least 5, but which are false in four dimensions. Here are some examples:
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holds for cobordisms provided that neither the cobordism nor its boundary has dimension 4. It can fail if the boundary of the cobordism has dimension 4 (as shown by Donaldson). If the cobordism has dimension 4, then it is unknown whether the h-cobordism theorem
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In any dimension other than 4, a compact topological manifold has only a finite number of essentially distinct PL or smooth structures. In dimension 4, compact manifolds can have a countable infinite number of non-diffeomorphic smooth
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in five or more dimensions made dimensions three and four seem the hardest; and indeed they required new methods, while the freedom of higher dimensions meant that questions could be reduced to computational methods available in
630:. While inspired by knots that appear in daily life in shoelaces and rope, a mathematician's knot differs in that the ends are joined together so that it cannot be undone. In mathematical language, a knot is an 1124:) vanishes. In dimension 3 and lower, every topological manifold admits an essentially unique PL structure. In dimension 4 there are many examples with vanishing Kirby–Siebenmann invariant but no PL structure. 499:. This classifies Riemannian surfaces as elliptic (positively curved—rather, admitting a constant positively curved metric), parabolic (flat), and hyperbolic (negatively curved) according to their 771: 561:, and smooth categories are all equivalent in three dimensions, so little distinction is made in whether we are dealing with say, topological 3-manifolds, or smooth 3-manifolds. 1112:
provides the obstruction to the existence of a PL structure; in other words a compact topological manifold has a PL structure if and only if its Kirby–Siebenmann invariant in H(
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The surfaces in the third family are nonorientable. The Euler characteristic of the real projective plane is 1, and in general the Euler characteristic of the connected sum of
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There are several theorems that in effect state that many of the most basic tools used to study high-dimensional manifolds do not apply to low-dimensional manifolds, such as:
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A topological manifold of dimension not equal to 4 has a handlebody decomposition. Manifolds of dimension 4 have a handlebody decomposition if and only if they are smoothable.
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has been proved for all dimensions other than 4, but it is not known whether it is true in 4 dimensions (it is equivalent to the smooth Poincaré conjecture in 4 dimensions).
920:). In three dimensions, it is not always possible to assign a single geometry to a whole topological space. Instead, the geometrization conjecture states that every closed 438:
structure and a wealth of natural metrics. The underlying topological space of TeichmĂĽller space was studied by Fricke, and the TeichmĂĽller metric on it was introduced by
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in the early 1980s not only led knot theory in new directions but gave rise to still mysterious connections between low-dimensional topology and
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can be decomposed in a canonical way into pieces that each have one of eight types of geometric structure. The conjecture was proposed by
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Any closed 3-manifold is the boundary of a 4-manifold. This theorem is due independently to several people: it follows from the
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that there are manifolds in each dimension greater than or equal to 5, that are not homeomorphic to a simplicial complex.
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A number of advances starting in the 1960s had the effect of emphasising low dimensions in topology. The solution by
1824: 721: 183:. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional 316:. It is convenient to combine the two families by regarding the sphere as the connected sum of 0 tori. The number 881: 558: 119: 1895: 1049: 937: 1909: 1018: 796: 708: 507: 1844: 1839: 1765: 1642: 1630: 1603: 1563: 1154: 933: 894: 570: 455: 216: 107: 1686: 1613: 1336: 834: 828: 646:(since we're using topology, a circle isn't bound to the classical geometric concept, but to all of its 476: 279: 1874: 1301: 650:). Two mathematical knots are equivalent if one can be transformed into the other via a deformation of 439: 1834: 1786: 1760: 1608: 1200: 959: 692: 582: 362: 325: 222: 180: 135: 1885: 1681: 1169: 917: 849: 792: 574: 143: 893:
each have a unique geometric structure that can be associated with them. It is an analogue of the
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Overall, this progress has led to better integration of the field into the rest of mathematics.
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is known in all dimensions other than 4 (it is usually false in dimensions at least 7; see
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is the three-dimensional space surrounding the knot. To make this precise, suppose that
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2 and 0, respectively, and in general the Euler characteristic of the connected sum of
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utilized a variety of tools from previously only weakly linked areas of mathematics.
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concept, and some generalizations. The idea is that braids can be organized into
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remained open (and still remains open to this day). For any positive integer
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is known to have exactly one smooth structure up to diffeomorphism provided
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to show there exists a continuum of non-diffeomorphic smooth structures on
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surface is homeomorphic to some member of one of these three families:
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announced a proof of the three-dimensional Poincaré conjecture, using
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A few typical theorems that distinguish low-dimensional topology
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Mathematical Proceedings of the Cambridge Philosophical Society
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are frequently-studied 3-manifolds. The knot complement of a
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of the plane to arbitrary simply connected Riemann surfaces.
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where a 'marking' is an isotopy class of homeomorphisms from
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has an uncountable number of exotic smooth structures; see
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by a subgroup of hyperbolic isometries acting freely and
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in three-dimensional Euclidean space without introducing
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other than 4, there are no exotic smooth structures on
1036:. The first examples were found in the early 1980s by 932:), and implies several other conjectures, such as the 745: 506:
The uniformization theorem is a generalization of the
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of a 3-manifold is the obstruction to orientability.
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4-manifolds are of importance in physics because, in
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may be regarded as an isomorphism class of 'marked'
70:. Representative topics are the structure theory of 1815: 1779: 1665: 1586: 1195:states that an orientable 3-manifold has a trivial 1044:'s theorems about smooth 4-manifolds. There is a 765: 300: 264: 46:is an important part of low-dimensional topology. 868:torus cross the closed half-ray and are called 1063:Prior to this construction, non-diffeomorphic 324:of the surface. The sphere and the torus have 1564: 1377:Bulletin of the American Mathematical Society 1087:≠ 4 then any smooth manifold homeomorphic to 766:{\displaystyle X_{K}=M-{\mbox{interior}}(N).} 34:A three-dimensional depiction of a thickened 8: 1248:. It has since been elaborated by Freedman, 443: 312:The surfaces in the first two families are 1932: 1905: 1571: 1557: 1549: 1099:Other special phenomena in four dimensions 1389: 1218:of the 3-manifold. It also follows from 744: 729: 723: 287: 251: 929: 1306:Abh. Preuss. Akad. Wiss. Math.-Nat. Kl. 1293: 908:can be given one of three geometries ( 889:states that certain three-dimensional 876:PoincarĂ© conjecture and geometrization 479:to one of the three domains: the open 1139:can have an exotic smooth structure. 804: 7: 1536:Problems in Low-Dimensional Topology 887:Thurston's geometrization conjecture 150:, an idea belonging to the field of 86:. This can be regarded as a part of 707:. The knot complement is then the 1236:. This was originally observed by 538:is a 3-manifold if every point in 431:TeichmĂĽller space has a canonical 25: 1543:links to low dimensional topology 1282:List of geometric topology topics 1931: 1904: 1894: 1884: 1873: 1863: 1862: 1656: 1464:Journal of Differential Geometry 1427:Journal of Differential Geometry 1199:. Stated another way, the only 1108:In dimensions other than 4, the 587:topological quantum field theory 424:. The TeichmĂĽller space is the 385:, is a space that parameterizes 381:of a (real) topological surface 1391:10.1090/S0273-0979-1982-15003-0 1161:). The PoincarĂ© conjecture for 428:of the (Riemann) moduli space. 320:of tori involved is called the 190:—for example, the surface of a 780:. Braid theory is an abstract 757: 751: 675:is a knot in a three-manifold 599:partial differential equations 1: 510:from proper simply connected 1334:(1947), "Theory of braids", 1231:exotic smooth structures on 491:. In particular it admits a 1153:The solution to the smooth 1131:Four is the only dimension 426:universal covering orbifold 1979: 1825:Banach fixed-point theorem 1226:ring of closed manifolds. 1110:Kirby–Siebenmann invariant 1000: 947: 901:, which states that every 879: 826: 612: 524: 453: 360: 210:Classification of surfaces 164: 1858: 1654: 1507:10.1017/S0305004100036756 1050:differentiable structures 882:Geometrization conjecture 654:upon itself (known as an 120:geometrization conjecture 1958:Low-dimensional topology 1056:, as was shown first by 938:elliptization conjecture 858:properly discontinuously 56:low-dimensional topology 1422:'s and other anomalies" 1240:, based on the work of 1019:differentiable manifold 966:is a 4-manifold with a 508:Riemann mapping theorem 301:{\displaystyle k\geq 1} 265:{\displaystyle g\geq 1} 206:or self-intersections. 1880:Mathematics portal 1780:Metrics and properties 1766:Second-countable space 1455:Taubes, Clifford Henry 1222:'s computation of the 895:uniformization theorem 823:Hyperbolic 3-manifolds 787:studying the everyday 767: 571:geometric group theory 477:conformally equivalent 466:uniformization theorem 456:Uniformization theorem 450:Uniformization theorem 440:Oswald TeichmĂĽller 403:identity homeomorphism 302: 280:real projective planes 266: 217:classification theorem 47: 18:4-dimensional topology 1337:Annals of Mathematics 1083:; in other words, if 1048:of non-diffeomorphic 835:hyperbolic 3-manifold 829:Hyperbolic 3-manifold 768: 609:Knot and braid theory 326:Euler characteristics 303: 275:the connected sum of 267: 33: 1835:Invariance of domain 1787:Euler characteristic 1761:Bundle (mathematics) 1372:Thurston, William P. 1201:characteristic class 1091:is diffeomorphic to 960:topological manifold 926:William Thurston 897:for two-dimensional 817:configuration spaces 722: 693:tubular neighborhood 393:up to the action of 286: 250: 181:topological manifold 136:mathematical physics 1845:Tychonoff's theorem 1840:PoincarĂ© conjecture 1594:General (point-set) 1302:TeichmĂĽller, Oswald 1170:h-cobordism theorem 1155:PoincarĂ© conjecture 958:is a 4-dimensional 934:PoincarĂ© conjecture 850:sectional curvature 776:A related topic is 575:hyperbolic geometry 144:Richard S. Hamilton 130:' discovery of the 108:PoincarĂ© conjecture 38:, the simplest non- 1963:Geometric topology 1830:De Rham cohomology 1751:Polyhedral complex 1741:Simplicial complex 1541:Mark Brittenham's 1216:Heegaard splitting 1193:Steenrod's theorem 983:General Relativity 891:topological spaces 799:, as was shown by 763: 749: 628:mathematical knots 603:geometric topology 583:TeichmĂĽller theory 497:constant curvature 387:complex structures 298: 262: 219:of closed surfaces 167:surface (topology) 152:geometric analysis 106:, in 1961, of the 88:geometric topology 48: 27:Branch of topology 1945: 1944: 1734:fundamental group 1488:Corollary 5.2 of 1340:, Second Series, 1229:The existence of 1065:smooth structures 991:pseudo-Riemannian 964:smooth 4-manifold 846:Riemannian metric 813:fundamental group 748: 638:in 3-dimensional 557:The topological, 552:Euclidean 3-space 533:topological space 493:Riemannian metric 373:TeichmĂĽller space 363:TeichmĂĽller space 357:TeichmĂĽller space 198:, that cannot be 58:is the branch of 16:(Redirected from 1970: 1935: 1934: 1908: 1907: 1898: 1888: 1878: 1877: 1866: 1865: 1660: 1573: 1566: 1559: 1550: 1519: 1517: 1486: 1480: 1479: 1450: 1444: 1442: 1414:Gompf, Robert E. 1410: 1404: 1402: 1393: 1368: 1362: 1360: 1328: 1322: 1320: 1298: 1238:Michael Freedman 1038:Michael Freedman 989:is modeled as a 968:smooth structure 903:simply-connected 854:hyperbolic space 841:equipped with a 772: 770: 769: 764: 750: 746: 734: 733: 662:Knot complements 626:is the study of 565:fields, such as 559:piecewise-linear 521:Three dimensions 470:simply connected 468:says that every 414:Riemann surfaces 405:. Each point in 352: 338: 307: 305: 304: 299: 271: 269: 268: 263: 221:states that any 140:Grigori Perelman 132:Jones polynomial 92:continuum theory 21: 1978: 1977: 1973: 1972: 1971: 1969: 1968: 1967: 1948: 1947: 1946: 1941: 1872: 1854: 1850:Urysohn's lemma 1811: 1775: 1661: 1652: 1624:low-dimensional 1582: 1577: 1528: 1523: 1522: 1491:Stallings, John 1489: 1487: 1483: 1453: 1452:Theorem 1.1 of 1451: 1447: 1412: 1411: 1407: 1370: 1369: 1365: 1350:10.2307/1969218 1330: 1329: 1325: 1300: 1299: 1295: 1290: 1278: 1258:Laurence Taylor 1254:Clifford Taubes 1242:Simon Donaldson 1187: 1101: 1058:Clifford Taubes 1042:Simon Donaldson 1031:Euclidean space 1008: 999: 952: 946: 944:Four dimensions 936:and Thurston's 906:Riemann surface 884: 878: 831: 825: 725: 720: 719: 656:ambient isotopy 640:Euclidean space 621: 613:Main articles: 611: 529: 523: 501:universal cover 473:Riemann surface 458: 452: 410: 379: 365: 359: 347: 333: 284: 283: 248: 247: 212: 185:Euclidean space 177:two-dimensional 169: 163: 124:Haken manifolds 100: 28: 23: 22: 15: 12: 11: 5: 1976: 1974: 1966: 1965: 1960: 1950: 1949: 1943: 1942: 1940: 1939: 1929: 1928: 1927: 1922: 1917: 1902: 1892: 1882: 1870: 1859: 1856: 1855: 1853: 1852: 1847: 1842: 1837: 1832: 1827: 1821: 1819: 1813: 1812: 1810: 1809: 1804: 1799: 1797:Winding number 1794: 1789: 1783: 1781: 1777: 1776: 1774: 1773: 1768: 1763: 1758: 1753: 1748: 1743: 1738: 1737: 1736: 1731: 1729:homotopy group 1721: 1720: 1719: 1714: 1709: 1704: 1699: 1689: 1684: 1679: 1669: 1667: 1663: 1662: 1655: 1653: 1651: 1650: 1645: 1640: 1639: 1638: 1628: 1627: 1626: 1616: 1611: 1606: 1601: 1596: 1590: 1588: 1584: 1583: 1578: 1576: 1575: 1568: 1561: 1553: 1547: 1546: 1539: 1527: 1526:External links 1524: 1521: 1520: 1481: 1471:(3): 363–430, 1445: 1434:(2): 317–328, 1418:"Three exotic 1405: 1384:(3): 357–381, 1380:, New Series, 1363: 1323: 1292: 1291: 1289: 1286: 1285: 1284: 1277: 1274: 1214:theorem via a 1197:tangent bundle 1186: 1183: 1182: 1181: 1177: 1174: 1166: 1151: 1129: 1125: 1100: 1097: 1069:exotic spheres 1001:Main article: 998: 995: 948:Main article: 945: 942: 880:Main article: 877: 874: 862:Kleinian model 827:Main article: 824: 821: 801:Emil Artin 774: 773: 762: 759: 756: 753: 743: 740: 737: 732: 728: 648:homeomorphisms 610: 607: 595:Floer homology 525:Main article: 522: 519: 489:Riemann sphere 454:Main article: 451: 448: 408: 395:homeomorphisms 377: 361:Main article: 358: 355: 310: 309: 297: 294: 291: 273: 261: 258: 255: 233: 211: 208: 165:Main article: 162: 161:Two dimensions 159: 113:surgery theory 99: 96: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1975: 1964: 1961: 1959: 1956: 1955: 1953: 1938: 1930: 1926: 1923: 1921: 1918: 1916: 1913: 1912: 1911: 1903: 1901: 1897: 1893: 1891: 1887: 1883: 1881: 1876: 1871: 1869: 1861: 1860: 1857: 1851: 1848: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1822: 1820: 1818: 1814: 1808: 1807:Orientability 1805: 1803: 1800: 1798: 1795: 1793: 1790: 1788: 1785: 1784: 1782: 1778: 1772: 1769: 1767: 1764: 1762: 1759: 1757: 1754: 1752: 1749: 1747: 1744: 1742: 1739: 1735: 1732: 1730: 1727: 1726: 1725: 1722: 1718: 1715: 1713: 1710: 1708: 1705: 1703: 1700: 1698: 1695: 1694: 1693: 1690: 1688: 1685: 1683: 1680: 1678: 1674: 1671: 1670: 1668: 1664: 1659: 1649: 1646: 1644: 1643:Set-theoretic 1641: 1637: 1634: 1633: 1632: 1629: 1625: 1622: 1621: 1620: 1617: 1615: 1612: 1610: 1607: 1605: 1604:Combinatorial 1602: 1600: 1597: 1595: 1592: 1591: 1589: 1585: 1581: 1574: 1569: 1567: 1562: 1560: 1555: 1554: 1551: 1544: 1540: 1537: 1533: 1530: 1529: 1525: 1516: 1512: 1508: 1504: 1500: 1496: 1492: 1485: 1482: 1478: 1474: 1470: 1466: 1465: 1460: 1456: 1449: 1446: 1441: 1437: 1433: 1429: 1428: 1423: 1421: 1415: 1409: 1406: 1401: 1397: 1392: 1387: 1383: 1379: 1378: 1373: 1367: 1364: 1359: 1355: 1351: 1347: 1343: 1339: 1338: 1333: 1327: 1324: 1319: 1315: 1311: 1307: 1303: 1297: 1294: 1287: 1283: 1280: 1279: 1275: 1273: 1271: 1267: 1264:. Meanwhile, 1263: 1259: 1255: 1251: 1247: 1246:Andrew Casson 1243: 1239: 1235: 1234: 1227: 1225: 1221: 1217: 1213: 1209: 1204: 1202: 1198: 1194: 1190: 1184: 1178: 1175: 1171: 1167: 1164: 1160: 1159:exotic sphere 1156: 1152: 1149: 1148: 1142: 1138: 1134: 1130: 1126: 1123: 1119: 1115: 1111: 1107: 1106: 1105: 1098: 1096: 1094: 1090: 1086: 1082: 1078: 1074: 1070: 1066: 1061: 1059: 1055: 1051: 1047: 1043: 1039: 1035: 1032: 1028: 1027:diffeomorphic 1024: 1020: 1016: 1013: 1007: 1006: 996: 994: 992: 988: 984: 979: 977: 976:diffeomorphic 973: 969: 965: 961: 957: 951: 943: 941: 939: 935: 931: 927: 923: 919: 915: 911: 907: 904: 900: 896: 892: 888: 883: 875: 873: 871: 865: 863: 859: 855: 851: 847: 844: 840: 836: 830: 822: 820: 818: 814: 810: 806: 802: 798: 797:presentations 794: 790: 786: 783: 779: 760: 754: 741: 738: 735: 730: 726: 718: 717: 716: 714: 710: 706: 702: 698: 694: 690: 686: 682: 679:(most often, 678: 674: 670: 667: 663: 659: 657: 653: 649: 645: 641: 637: 633: 629: 625: 620: 616: 608: 606: 604: 600: 596: 592: 588: 584: 580: 579:number theory 576: 572: 568: 562: 560: 555: 553: 549: 545: 544:neighbourhood 541: 537: 534: 528: 520: 518: 516: 513: 509: 504: 502: 498: 494: 490: 486: 485:complex plane 482: 478: 474: 471: 467: 463: 457: 449: 447: 445: 441: 437: 434: 429: 427: 423: 419: 415: 411: 404: 400: 396: 392: 388: 384: 380: 374: 370: 364: 356: 354: 351: 345: 340: 337: 331: 327: 323: 319: 315: 295: 292: 289: 281: 278: 274: 259: 256: 253: 245: 242: 238: 237:connected sum 234: 231: 230: 229: 227: 224: 220: 218: 209: 207: 205: 204:singularities 201: 197: 193: 189: 186: 182: 178: 174: 168: 160: 158: 155: 153: 149: 145: 141: 137: 133: 129: 128:Vaughan Jones 125: 121: 118: 114: 109: 105: 104:Stephen Smale 97: 95: 93: 89: 85: 81: 77: 73: 69: 65: 62:that studies 61: 57: 53: 45: 41: 37: 32: 19: 1937:Publications 1802:Chern number 1792:Betti number 1675: / 1666:Key concepts 1623: 1614:Differential 1498: 1494: 1484: 1468: 1462: 1448: 1431: 1425: 1419: 1408: 1381: 1375: 1366: 1341: 1335: 1326: 1309: 1305: 1296: 1269: 1265: 1261: 1250:Robert Gompf 1232: 1228: 1205: 1192: 1191: 1188: 1163:PL manifolds 1146: 1140: 1136: 1132: 1121: 1117: 1113: 1102: 1092: 1088: 1084: 1080: 1076: 1062: 1053: 1033: 1023:homeomorphic 1014: 1011: 1009: 1004: 993:4-manifold. 980: 972:homeomorphic 963: 955: 953: 885: 869: 866: 860:. See also 848:of constant 832: 809:braid groups 778:braid theory 775: 712: 700: 696: 688: 680: 676: 672: 668: 660: 651: 643: 622: 619:Braid theory 591:gauge theory 563: 556: 548:homeomorphic 539: 535: 530: 505: 465: 459: 430: 421: 417: 406: 390: 382: 375: 372: 366: 349: 343: 341: 335: 329: 321: 317: 311: 276: 240: 215: 213: 196:Klein bottle 187: 170: 156: 101: 84:braid groups 55: 49: 40:trivial knot 36:trefoil knot 1900:Wikiversity 1817:Key results 1501:: 481–488, 1344:: 101–126, 1312:(22): 197, 1168:The smooth 1128:structures. 1067:on spheres— 815:of certain 705:solid torus 624:Knot theory 615:Knot theory 567:knot theory 462:mathematics 369:mathematics 346:of them is 334:2 − 2 232:the sphere; 138:. In 2002, 80:knot theory 76:4-manifolds 72:3-manifolds 52:mathematics 44:Knot theory 1952:Categories 1746:CW complex 1687:Continuity 1677:Closed set 1636:cohomology 1288:References 1135:for which 956:4-manifold 950:4-manifold 922:3-manifold 918:hyperbolic 839:3-manifold 709:complement 527:3-manifold 348:2 − 314:orientable 148:Ricci flow 117:Thurston's 68:dimensions 1925:geometric 1920:algebraic 1771:Cobordism 1707:Hausdorff 1702:connected 1619:Geometric 1609:Continuum 1599:Algebraic 1532:Rob Kirby 1332:Artin, E. 1224:cobordism 1220:RenĂ© Thom 1212:Lickorish 1046:continuum 987:spacetime 914:spherical 910:Euclidean 782:geometric 742:− 666:tame knot 632:embedding 487:, or the 481:unit disk 397:that are 293:≥ 257:≥ 223:connected 64:manifolds 1890:Wikibook 1868:Category 1756:Manifold 1724:Homotopy 1682:Interior 1673:Open set 1631:Homology 1580:Topology 1457:(1987), 1416:(1983), 1276:See also 1073:4-sphere 1025:but not 1021:that is 997:Exotic R 974:but not 899:surfaces 843:complete 747:interior 687:). Let 685:3-sphere 683:is the 546:that is 436:manifold 399:isotopic 332:tori is 200:embedded 60:topology 1915:general 1717:uniform 1697:compact 1648:Digital 1515:0149457 1477:0882829 1440:0710057 1400:0648524 1358:0019087 1318:0003242 1210:– 1145:exotic 1029:to the 1003:Exotic 928: ( 803: ( 515:subsets 442: ( 433:complex 401:to the 173:surface 98:History 1910:Topics 1712:metric 1587:Fields 1513:  1475:  1438:  1398:  1356:  1316:  1173:holds. 1012:exotic 793:groups 785:theory 636:circle 597:, and 542:has a 483:, the 464:, the 371:, the 282:, for 246:, for 226:closed 82:, and 1692:Space 1272:≠ 4. 1017:is a 916:, or 870:cusps 837:is a 789:braid 703:is a 699:; so 691:be a 634:of a 322:genus 175:is a 1310:1939 1256:and 1244:and 1208:Dehn 962:. A 930:1982 805:1947 617:and 512:open 444:1940 244:tori 235:the 214:The 192:ball 74:and 1534:'s 1503:doi 1386:doi 1346:doi 1052:of 1010:An 978:). 711:of 695:of 577:, 550:to 495:of 475:is 460:In 446:). 420:to 389:on 367:In 239:of 146:'s 115:. 50:In 1954:: 1511:MR 1509:, 1499:58 1497:, 1473:MR 1469:25 1467:, 1461:, 1436:MR 1432:18 1430:, 1424:, 1396:MR 1394:, 1354:MR 1352:, 1342:48 1314:MR 1308:, 1252:, 1120:/2 1095:. 1060:. 985:, 954:A 940:. 912:, 864:. 833:A 819:. 715:, 642:, 605:. 593:, 589:, 585:, 581:, 573:, 569:, 554:. 531:A 503:. 353:. 339:. 179:, 171:A 154:. 94:. 78:, 54:, 42:. 1572:e 1565:t 1558:v 1518:. 1505:: 1443:. 1420:R 1403:. 1388:: 1382:6 1361:. 1348:: 1321:. 1270:n 1266:R 1262:R 1233:R 1150:. 1147:R 1141:R 1137:R 1133:n 1122:Z 1118:Z 1116:, 1114:M 1093:R 1089:R 1085:n 1081:R 1077:n 1054:R 1034:R 1015:R 1005:R 761:. 758:) 755:N 752:( 739:M 736:= 731:K 727:X 713:N 701:N 697:K 689:N 681:M 677:M 673:K 669:K 652:R 644:R 540:X 536:X 422:X 418:X 409:X 407:T 391:X 383:X 378:X 376:T 350:k 344:k 336:g 330:g 318:g 308:. 296:1 290:k 277:k 272:; 260:1 254:g 241:g 188:R 20:)

Index

4-dimensional topology

trefoil knot
trivial knot
Knot theory
mathematics
topology
manifolds
dimensions
3-manifolds
4-manifolds
knot theory
braid groups
geometric topology
continuum theory
Stephen Smale
Poincaré conjecture
surgery theory
Thurston's
geometrization conjecture
Haken manifolds
Vaughan Jones
Jones polynomial
mathematical physics
Grigori Perelman
Richard S. Hamilton
Ricci flow
geometric analysis
surface (topology)
surface

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