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Algebraic cycle

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While divisors on higher-dimensional varieties continue to play an important role in determining the structure of the variety, on varieties of dimension two or more there are also higher codimension cycles to consider. The behavior of these cycles is strikingly different from that of divisors. For
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There are several variants of the above definition. We may substitute another ring for integers as our coefficient ring. The case of rational coefficients is widely used. Working with families of cycles over a base, or using cycles in arithmetic situations, requires a relative setup. Let
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under the map that, in one direction, takes each subscheme to its generic point, and in the other direction, takes each point to the unique reduced subscheme supported on the closure of the point. Consequently
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The most trivial case is codimension zero cycles, which are linear combinations of the irreducible components of the variety. The first non-trivial case is of codimension one subvarieties, called
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are formal linear combinations of points on the curve. Classical work on algebraic curves related these to intrinsic data, such as the regular differentials on a compact
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that is directly accessible by algebraic methods. Understanding the algebraic cycles on a variety can give profound insights into the structure of the variety.
765: 2104: 427: 1617:, as well as all of the above modulo torsion. These equivalence relations have (partially conjectural) applications to the theory of 1602: 276: 54:. The earliest work on algebraic cycles focused on the case of divisors, particularly divisors on algebraic curves. Divisors on 2135:
The arithmetic and geometry of algebraic cycles: proceedings of the CRM summer school, June 7–19, 1998, Banff, Alberta, Canada
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proved that the existence of a category of motives implies the standard conjectures. Additionally, cycles are connected to
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such that every divisor of degree zero is linearly equivalent to a difference of two effective divisors of degree at most
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and would imply that algebraic cycles play a vital role in any cohomology theory of algebraic varieties. Conversely,
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of some constant relative dimension (i.e. all fibers have the same dimension), we can define for any subvariety
1104: 176: 93: 2096: 1853: 1512: 2011:{\displaystyle f^{*}\colon Z^{k}(X')\to Z^{k}(X)\quad {\text{and}}\quad f_{*}\colon Z_{k}(X)\to Z_{k}(X')\,\!} 1559: 2034: 251:
The behavior of algebraic cycles ranks among the most important open questions in modern mathematics. The
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by Bloch's formula, which expresses groups of cycles modulo rational equivalence as the cohomology of
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Gordon, B. Brent; Lewis, James D.; MĂĽller-Stach, Stefan; Saito, Shuji; Yui, Noriko, eds. (2000),
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There is a covariant and a contravariant functoriality of the group of algebraic cycles. Let
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contains transcendental information, and in effect Mumford's theorem implies that, despite
2107:. Third series. A Series of Modern Surveys in Mathematics, vol. 2, Berlin, New York: 1483: 8: 284: 268: 133:
is false. The hypothesis that the geometric genus is positive essentially means (by the
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for a fixed cohomology theory (such as singular cohomology or Ă©tale cohomology),
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having a purely algebraic definition, it shares transcendental information with
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By linearity, these definitions extend to homomorphisms of abelian groups
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Chow Rings, Decomposition of the Diagonal, and the Topology of Families
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for a discussion of the functoriality related to the ring structure.
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are in one-to-one correspondence with the scheme-theoretic points of
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Rational equivalence can also be replaced by several other coarser
486:{\displaystyle Z_{r}X=\bigoplus _{V\subseteq X}\mathbf {Z} \cdot ,} 631:
can also be described as the free abelian group on the points of
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of rational equivalence classes of codimension two cycles in
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proved that, on a smooth complete complex algebraic surface
934:. The cycles rationally equivalent to zero are a subgroup 248:. Mumford's theorem has since been greatly generalized. 1446:-cycle is a formal sum of closed integral subschemes of 1091:{\displaystyle A_{r}(X)=Z_{r}(X)/Z_{r}(X)_{\text{rat}}.} 1624: 1398:
because it has a multiplication operation given by the
992:{\displaystyle Z_{r}(X)_{\text{rat}}\subseteq Z_{r}(X)} 1880: 1783: 1669: 1562: 1515: 1486: 1460: 1412: 1366: 1308: 1250: 1149: 1107: 1012: 940: 897: 829: 773: 753: 726: 694: 668: 644: 607: 517: 430: 340: 218: 179: 143: 96: 2079:, Annals of Mathematics Studies 187, February 2014, 1003:-cycles modulo rational equivalence is the quotient 2137:, Providence, R.I.: American Mathematical Society, 1605:. Other equivalence relations of interest include 2010: 1837: 1740: 1586: 1548: 1501: 1472: 1430: 1382: 1349: 1288: 1230:if they can be represented by an effective cycle. 1203: 1132: 1090: 991: 917: 883: 815: 759: 739: 712: 680: 650: 623: 562: 485: 372: 240: 204: 165: 121: 2007: 1834: 1737: 496:where the sum is over closed integral subschemes 279:yield enough cycles to construct his category of 2152: 2105:Ergebnisse der Mathematik und ihrer Grenzgebiete 1751:which by assumption has the same codimension as 1204:{\displaystyle A_{*}(X)=\bigoplus _{r}A_{r}(X)} 925:denotes the divisor of a rational function on 1237:is smooth, projective, and of pure dimension 2060:Rational equivalence of 0-cycles on surfaces 918:{\displaystyle \operatorname {div} _{W_{i}}} 563:{\displaystyle Z_{*}X=\bigoplus _{r}Z_{r}X.} 816:{\displaystyle r_{i}\in k(W_{i})^{\times }} 1133:{\displaystyle \operatorname {CH} _{r}(X)} 589:if all its coefficients are non-negative. 205:{\displaystyle \operatorname {CH} ^{2}(S)} 122:{\displaystyle \operatorname {CH} ^{2}(S)} 2006: 1833: 1736: 1603:equivalence relations on algebraic cycles 1549:{\displaystyle k({\overline {\phi (Y)}})} 277:standard conjectures on algebraic cycles 90:, the analogous statement for the group 2153: 2095: 1587:{\displaystyle {\overline {\phi (Y)}}} 1625:Flat pullback and proper pushforward 1442:is a regular Noetherian scheme. An 504:. The groups of cycles for varying 70:example, every curve has a constant 13: 1852:is the degree of the extension of 1431:{\displaystyle \phi \colon X\to S} 688:, if there are a finite number of 421:-cycles is the free abelian group 315:which is finite type over a field 135:Lefschetz theorem on (1,1)-classes 31:is a formal linear combination of 14: 2172: 1774:the pushforward is defined to be 1454:; here the relative dimension of 1350:{\displaystyle A^{N-r}X=A_{r}X.} 1222:. Cycle classes are said to be 767:and non-zero rational functions 464: 1946: 1940: 1480:is the transcendence degree of 1289:{\displaystyle Z^{N-r}X=Z_{r}X} 577:, and any element is called an 331:is a formal linear combination 267:makes a similar prediction for 2069: 2052: 2003: 1992: 1979: 1976: 1970: 1937: 1931: 1918: 1915: 1904: 1830: 1827: 1821: 1815: 1806: 1803: 1797: 1794: 1733: 1730: 1719: 1703: 1697: 1694: 1683: 1680: 1575: 1569: 1543: 1534: 1528: 1519: 1496: 1490: 1422: 1198: 1192: 1166: 1160: 1127: 1121: 1076: 1069: 1051: 1045: 1029: 1023: 986: 980: 958: 951: 878: 875: 862: 839: 804: 790: 707: 695: 592:Closed integral subschemes of 477: 471: 367: 354: 235: 229: 199: 193: 160: 154: 116: 110: 1: 2045: 1838:{\displaystyle f_{*}()=n\,\!} 884:{\displaystyle \alpha =\sum } 681:{\displaystyle \alpha \sim 0} 660:rationally equivalent to zero 387:-dimensional closed integral 302: 39:. These are the part of the 2035:divisor (algebraic geometry) 1741:{\displaystyle f^{*}()=\,\!} 1579: 1538: 1473:{\displaystyle Y\subseteq X} 1450:whose relative dimension is 137:) that the cohomology group 7: 2028: 1101:This group is also denoted 10: 2177: 720:-dimensional subvarieties 373:{\displaystyle \sum n_{i}} 257:Clay Mathematics Institute 1556:minus the codimension of 1140:. Elements of the group 575:group of algebraic cycles 261:Millennium Prize Problems 2062:, J. Math. Kyoto Univ. 241:{\displaystyle H^{2}(S)} 166:{\displaystyle H^{2}(S)} 1641:be a map of varieties. 1611:homological equivalence 651:{\displaystyle \alpha } 2012: 1856:if the restriction of 1839: 1742: 1588: 1550: 1503: 1474: 1432: 1384: 1383:{\displaystyle A^{*}X} 1351: 1290: 1205: 1134: 1092: 993: 919: 885: 817: 761: 741: 714: 682: 652: 625: 624:{\displaystyle Z_{*}X} 564: 508:together form a group 487: 374: 273:Alexander Grothendieck 242: 206: 167: 123: 2013: 1840: 1743: 1615:numerical equivalence 1607:algebraic equivalence 1589: 1551: 1504: 1475: 1433: 1385: 1352: 1291: 1206: 1135: 1093: 994: 920: 886: 818: 762: 742: 740:{\displaystyle W_{i}} 715: 713:{\displaystyle (r+1)} 683: 653: 626: 565: 488: 375: 243: 207: 168: 124: 1878: 1781: 1667: 1560: 1513: 1502:{\displaystyle k(Y)} 1484: 1458: 1410: 1400:intersection product 1364: 1306: 1248: 1147: 1105: 1010: 938: 895: 827: 771: 751: 724: 692: 666: 642: 605: 515: 428: 338: 216: 177: 141: 94: 2101:Intersection theory 999:, and the group of 573:This is called the 395:. The coefficient 285:Alexander Beilinson 2161:Algebraic geometry 2066:-2 (1969) 195–204. 2008: 1835: 1738: 1584: 1546: 1499: 1470: 1428: 1380: 1347: 1286: 1201: 1181: 1130: 1088: 989: 915: 881: 813: 757: 737: 710: 678: 648: 621: 560: 543: 483: 462: 417:. The set of all 370: 238: 202: 163: 119: 41:algebraic topology 2144:978-0-8218-1954-8 2118:978-0-387-98549-7 1944: 1868:and 0 otherwise. 1582: 1541: 1172: 1082: 964: 760:{\displaystyle X} 534: 447: 299:-theory sheaves. 26:algebraic variety 2168: 2147: 2129: 2088: 2075:Voisin, Claire, 2073: 2067: 2058:Mumford, David, 2056: 2017: 2015: 2014: 2009: 2002: 1991: 1990: 1969: 1968: 1956: 1955: 1945: 1942: 1930: 1929: 1914: 1903: 1902: 1890: 1889: 1844: 1842: 1841: 1836: 1793: 1792: 1770:a subvariety of 1747: 1745: 1744: 1739: 1729: 1718: 1717: 1693: 1679: 1678: 1593: 1591: 1590: 1585: 1583: 1578: 1564: 1555: 1553: 1552: 1547: 1542: 1537: 1523: 1508: 1506: 1505: 1500: 1479: 1477: 1476: 1471: 1437: 1435: 1434: 1429: 1389: 1387: 1386: 1381: 1376: 1375: 1356: 1354: 1353: 1348: 1340: 1339: 1324: 1323: 1295: 1293: 1292: 1287: 1282: 1281: 1266: 1265: 1210: 1208: 1207: 1202: 1191: 1190: 1180: 1159: 1158: 1139: 1137: 1136: 1131: 1117: 1116: 1097: 1095: 1094: 1089: 1084: 1083: 1080: 1068: 1067: 1058: 1044: 1043: 1022: 1021: 998: 996: 995: 990: 979: 978: 966: 965: 962: 950: 949: 924: 922: 921: 916: 914: 913: 912: 911: 890: 888: 887: 882: 874: 873: 858: 857: 856: 855: 822: 820: 819: 814: 812: 811: 802: 801: 783: 782: 766: 764: 763: 758: 746: 744: 743: 738: 736: 735: 719: 717: 716: 711: 687: 685: 684: 679: 657: 655: 654: 649: 630: 628: 627: 622: 617: 616: 569: 567: 566: 561: 553: 552: 542: 527: 526: 492: 490: 489: 484: 467: 461: 440: 439: 379: 377: 376: 371: 366: 365: 353: 352: 269:Ă©tale cohomology 253:Hodge conjecture 247: 245: 244: 239: 228: 227: 211: 209: 208: 203: 189: 188: 172: 170: 169: 164: 153: 152: 128: 126: 125: 120: 106: 105: 64:projective space 56:algebraic curves 2176: 2175: 2171: 2170: 2169: 2167: 2166: 2165: 2151: 2150: 2145: 2119: 2109:Springer-Verlag 2097:Fulton, William 2092: 2091: 2074: 2070: 2057: 2053: 2048: 2031: 1995: 1986: 1982: 1964: 1960: 1951: 1947: 1941: 1925: 1921: 1907: 1898: 1894: 1885: 1881: 1879: 1876: 1875: 1854:function fields 1788: 1784: 1782: 1779: 1778: 1758:Conversely, if 1722: 1710: 1706: 1686: 1674: 1670: 1668: 1665: 1664: 1627: 1565: 1563: 1561: 1558: 1557: 1524: 1522: 1514: 1511: 1510: 1485: 1482: 1481: 1459: 1456: 1455: 1411: 1408: 1407: 1371: 1367: 1365: 1362: 1361: 1335: 1331: 1313: 1309: 1307: 1304: 1303: 1277: 1273: 1255: 1251: 1249: 1246: 1245: 1186: 1182: 1176: 1154: 1150: 1148: 1145: 1144: 1112: 1108: 1106: 1103: 1102: 1079: 1075: 1063: 1059: 1054: 1039: 1035: 1017: 1013: 1011: 1008: 1007: 974: 970: 961: 957: 945: 941: 939: 936: 935: 933: 907: 903: 902: 898: 896: 893: 892: 869: 865: 851: 847: 846: 842: 828: 825: 824: 807: 803: 797: 793: 778: 774: 772: 769: 768: 752: 749: 748: 731: 727: 725: 722: 721: 693: 690: 689: 667: 664: 663: 643: 640: 639: 612: 608: 606: 603: 602: 579:algebraic cycle 548: 544: 538: 522: 518: 516: 513: 512: 463: 451: 435: 431: 429: 426: 425: 416: 403: 391:-subschemes of 361: 357: 348: 344: 339: 336: 335: 305: 265:Tate conjecture 223: 219: 217: 214: 213: 184: 180: 178: 175: 174: 148: 144: 142: 139: 138: 101: 97: 95: 92: 91: 88:geometric genus 60:Riemann surface 22:algebraic cycle 12: 11: 5: 2174: 2164: 2163: 2149: 2148: 2143: 2130: 2117: 2090: 2089: 2068: 2050: 2049: 2047: 2044: 2043: 2042: 2040:Relative cycle 2037: 2030: 2027: 2019: 2018: 2005: 2001: 1998: 1994: 1989: 1985: 1981: 1978: 1975: 1972: 1967: 1963: 1959: 1954: 1950: 1939: 1936: 1933: 1928: 1924: 1920: 1917: 1913: 1910: 1906: 1901: 1897: 1893: 1888: 1884: 1846: 1845: 1832: 1829: 1826: 1823: 1820: 1817: 1814: 1811: 1808: 1805: 1802: 1799: 1796: 1791: 1787: 1749: 1748: 1735: 1732: 1728: 1725: 1721: 1716: 1713: 1709: 1705: 1702: 1699: 1696: 1692: 1689: 1685: 1682: 1677: 1673: 1626: 1623: 1581: 1577: 1574: 1571: 1568: 1545: 1540: 1536: 1533: 1530: 1527: 1521: 1518: 1498: 1495: 1492: 1489: 1469: 1466: 1463: 1427: 1424: 1421: 1418: 1415: 1390:is called the 1379: 1374: 1370: 1360:In this case, 1358: 1357: 1346: 1343: 1338: 1334: 1330: 1327: 1322: 1319: 1316: 1312: 1297: 1296: 1285: 1280: 1276: 1272: 1269: 1264: 1261: 1258: 1254: 1212: 1211: 1200: 1197: 1194: 1189: 1185: 1179: 1175: 1171: 1168: 1165: 1162: 1157: 1153: 1129: 1126: 1123: 1120: 1115: 1111: 1099: 1098: 1087: 1078: 1074: 1071: 1066: 1062: 1057: 1053: 1050: 1047: 1042: 1038: 1034: 1031: 1028: 1025: 1020: 1016: 988: 985: 982: 977: 973: 969: 960: 956: 953: 948: 944: 929: 910: 906: 901: 880: 877: 872: 868: 864: 861: 854: 850: 845: 841: 838: 835: 832: 810: 806: 800: 796: 792: 789: 786: 781: 777: 756: 734: 730: 709: 706: 703: 700: 697: 677: 674: 671: 647: 620: 615: 611: 581:. A cycle is 571: 570: 559: 556: 551: 547: 541: 537: 533: 530: 525: 521: 494: 493: 482: 479: 476: 473: 470: 466: 460: 457: 454: 450: 446: 443: 438: 434: 412: 399: 381: 380: 369: 364: 360: 356: 351: 347: 343: 304: 301: 237: 234: 231: 226: 222: 201: 198: 195: 192: 187: 183: 162: 159: 156: 151: 147: 118: 115: 112: 109: 104: 100: 86:with positive 9: 6: 4: 3: 2: 2173: 2162: 2159: 2158: 2156: 2146: 2140: 2136: 2131: 2128: 2124: 2120: 2114: 2110: 2106: 2102: 2098: 2094: 2093: 2086: 2085:9780691160504 2082: 2078: 2072: 2065: 2061: 2055: 2051: 2041: 2038: 2036: 2033: 2032: 2026: 2024: 1999: 1996: 1987: 1983: 1973: 1965: 1961: 1957: 1952: 1948: 1934: 1926: 1922: 1911: 1908: 1899: 1895: 1891: 1886: 1882: 1874: 1873: 1872: 1869: 1867: 1863: 1859: 1855: 1851: 1824: 1818: 1812: 1809: 1800: 1789: 1785: 1777: 1776: 1775: 1773: 1769: 1765: 1761: 1756: 1754: 1726: 1723: 1714: 1711: 1707: 1700: 1690: 1687: 1675: 1671: 1663: 1662: 1661: 1659: 1656: âŠ‚  1655: 1651: 1647: 1642: 1640: 1636: 1632: 1622: 1620: 1616: 1612: 1608: 1604: 1599: 1597: 1572: 1566: 1531: 1525: 1516: 1493: 1487: 1467: 1464: 1461: 1453: 1449: 1445: 1441: 1425: 1419: 1416: 1413: 1403: 1401: 1397: 1393: 1377: 1372: 1368: 1344: 1341: 1336: 1332: 1328: 1325: 1320: 1317: 1314: 1310: 1302: 1301: 1300: 1283: 1278: 1274: 1270: 1267: 1262: 1259: 1256: 1252: 1244: 1243: 1242: 1240: 1236: 1231: 1229: 1225: 1221: 1217: 1216:cycle classes 1195: 1187: 1183: 1177: 1173: 1169: 1163: 1155: 1151: 1143: 1142: 1141: 1124: 1118: 1113: 1109: 1085: 1072: 1064: 1060: 1055: 1048: 1040: 1036: 1032: 1026: 1018: 1014: 1006: 1005: 1004: 1002: 983: 975: 971: 967: 954: 946: 942: 932: 928: 908: 904: 899: 870: 866: 859: 852: 848: 843: 836: 833: 830: 808: 798: 794: 787: 784: 779: 775: 754: 732: 728: 704: 701: 698: 675: 672: 669: 661: 645: 636: 634: 618: 613: 609: 599: 595: 590: 588: 584: 580: 576: 557: 554: 549: 545: 539: 535: 531: 528: 523: 519: 511: 510: 509: 507: 503: 499: 480: 474: 468: 458: 455: 452: 448: 444: 441: 436: 432: 424: 423: 422: 420: 415: 411: 407: 402: 398: 394: 390: 386: 362: 358: 349: 345: 341: 334: 333: 332: 330: 326: 324: 318: 314: 310: 300: 298: 294: 292: 286: 282: 278: 274: 270: 266: 262: 258: 255:, one of the 254: 249: 232: 224: 220: 196: 190: 185: 181: 157: 149: 145: 136: 132: 113: 107: 102: 98: 89: 85: 81: 80:David Mumford 77: 73: 67: 65: 61: 57: 53: 48: 46: 42: 38: 34: 30: 27: 23: 19: 2134: 2100: 2076: 2071: 2063: 2059: 2054: 2020: 1870: 1861: 1857: 1849: 1847: 1771: 1767: 1759: 1757: 1752: 1750: 1657: 1653: 1645: 1643: 1638: 1634: 1630: 1628: 1614: 1610: 1606: 1600: 1595: 1451: 1447: 1443: 1439: 1404: 1395: 1359: 1298: 1238: 1234: 1232: 1227: 1223: 1219: 1215: 1213: 1100: 1000: 930: 926: 659: 637: 632: 597: 593: 591: 586: 582: 578: 574: 572: 505: 501: 497: 495: 418: 413: 409: 406:multiplicity 405: 400: 396: 392: 388: 384: 382: 328: 322: 320: 316: 308: 306: 296: 290: 250: 130: 83: 75: 71: 68: 49: 44: 36: 33:subvarieties 28: 21: 15: 1214:are called 18:mathematics 2046:References 823:such that 662:, written 321:algebraic 303:Definition 289:algebraic 2023:Chow ring 1980:→ 1958:: 1953:∗ 1919:→ 1892:: 1887:∗ 1790:∗ 1712:− 1676:∗ 1580:¯ 1567:ϕ 1539:¯ 1526:ϕ 1465:⊆ 1423:→ 1417:: 1414:ϕ 1392:Chow ring 1373:∗ 1318:− 1260:− 1224:effective 1174:⨁ 1156:∗ 1119:⁡ 968:⊆ 860:⁡ 837:∑ 831:α 809:× 785:∈ 673:∼ 670:α 646:α 614:∗ 583:effective 536:⨁ 524:∗ 469:⋅ 456:⊆ 449:⨁ 342:∑ 191:⁡ 108:⁡ 2155:Category 2099:(1998), 2029:See also 2000:′ 1912:′ 1753:Y′ 1727:′ 1691:′ 1633: : 1438:, where 1228:positive 891:, where 638:A cycle 587:positive 52:divisors 2127:1644323 1619:motives 404:is the 293:-theory 281:motives 2141:  2125:  2115:  2083:  1866:finite 1848:where 1766:, for 1764:proper 325:-cycle 319:. An 313:scheme 24:on an 1509:over 311:be a 20:, an 2139:ISBN 2113:ISBN 2081:ISBN 1650:flat 1299:and 307:Let 1943:and 1864:is 1860:to 1762:is 1648:is 1644:If 1594:in 1394:of 1233:If 1226:or 1218:on 1081:rat 963:rat 900:div 844:div 747:of 658:is 585:or 500:of 408:of 383:of 327:on 275:'s 271:. 259:'s 78:. 43:of 35:of 16:In 2157:: 2123:MR 2121:, 2111:, 2103:, 1755:. 1660:: 1658:X' 1654:Y' 1639:X' 1637:→ 1621:. 1609:, 1598:. 1402:. 1110:CH 635:. 182:CH 99:CH 66:. 2087:. 2064:9 2004:) 1997:X 1993:( 1988:k 1984:Z 1977:) 1974:X 1971:( 1966:k 1962:Z 1949:f 1938:) 1935:X 1932:( 1927:k 1923:Z 1916:) 1909:X 1905:( 1900:k 1896:Z 1883:f 1862:Y 1858:f 1850:n 1831:] 1828:) 1825:Y 1822:( 1819:f 1816:[ 1813:n 1810:= 1807:) 1804:] 1801:Y 1798:[ 1795:( 1786:f 1772:X 1768:Y 1760:f 1734:] 1731:) 1724:Y 1720:( 1715:1 1708:f 1704:[ 1701:= 1698:) 1695:] 1688:Y 1684:[ 1681:( 1672:f 1646:f 1635:X 1631:f 1596:S 1576:) 1573:Y 1570:( 1544:) 1535:) 1532:Y 1529:( 1520:( 1517:k 1497:) 1494:Y 1491:( 1488:k 1468:X 1462:Y 1452:r 1448:X 1444:r 1440:S 1426:S 1420:X 1396:X 1378:X 1369:A 1345:. 1342:X 1337:r 1333:A 1329:= 1326:X 1321:r 1315:N 1311:A 1284:X 1279:r 1275:Z 1271:= 1268:X 1263:r 1257:N 1253:Z 1239:N 1235:X 1220:X 1199:) 1196:X 1193:( 1188:r 1184:A 1178:r 1170:= 1167:) 1164:X 1161:( 1152:A 1128:) 1125:X 1122:( 1114:r 1086:. 1077:) 1073:X 1070:( 1065:r 1061:Z 1056:/ 1052:) 1049:X 1046:( 1041:r 1037:Z 1033:= 1030:) 1027:X 1024:( 1019:r 1015:A 1001:r 987:) 984:X 981:( 976:r 972:Z 959:) 955:X 952:( 947:r 943:Z 931:i 927:W 909:i 905:W 879:] 876:) 871:i 867:r 863:( 853:i 849:W 840:[ 834:= 805:) 799:i 795:W 791:( 788:k 780:i 776:r 755:X 733:i 729:W 708:) 705:1 702:+ 699:r 696:( 676:0 633:X 619:X 610:Z 598:X 594:X 558:. 555:X 550:r 546:Z 540:r 532:= 529:X 520:Z 506:r 502:X 498:V 481:, 478:] 475:V 472:[ 465:Z 459:X 453:V 445:= 442:X 437:r 433:Z 419:r 414:i 410:V 401:i 397:n 393:X 389:k 385:r 368:] 363:i 359:V 355:[ 350:i 346:n 329:X 323:r 317:k 309:X 297:K 291:K 236:) 233:S 230:( 225:2 221:H 200:) 197:S 194:( 186:2 161:) 158:S 155:( 150:2 146:H 131:S 117:) 114:S 111:( 103:2 84:S 76:N 72:N 45:V 37:V 29:V

Index

mathematics
algebraic variety
subvarieties
algebraic topology
divisors
algebraic curves
Riemann surface
projective space
David Mumford
geometric genus
Lefschetz theorem on (1,1)-classes
Hodge conjecture
Clay Mathematics Institute
Millennium Prize Problems
Tate conjecture
Ă©tale cohomology
Alexander Grothendieck
standard conjectures on algebraic cycles
motives
Alexander Beilinson
algebraic K-theory
scheme
Chow ring
intersection product
equivalence relations on algebraic cycles
motives
flat
proper
function fields
finite

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