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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.
776: 2115: 438: 1628:, as well as all of the above modulo torsion. These equivalence relations have (partially conjectural) applications to the theory of 1613: 287: 65:. The earliest work on algebraic cycles focused on the case of divisors, particularly divisors on algebraic curves. Divisors on 2146:
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
1115: 187: 104: 2107: 1864: 1523: 2022:{\displaystyle f^{*}\colon Z^{k}(X')\to Z^{k}(X)\quad {\text{and}}\quad f_{*}\colon Z_{k}(X)\to Z_{k}(X')\,\!} 1570: 2045: 262:
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
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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
497:{\displaystyle Z_{r}X=\bigoplus _{V\subseteq X}\mathbf {Z} \cdot ,} 642:
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
945:. The cycles rationally equivalent to zero are a subgroup 259:. Mumford's theorem has since been greatly generalized. 1457:-cycle is a formal sum of closed integral subschemes of 1102:{\displaystyle A_{r}(X)=Z_{r}(X)/Z_{r}(X)_{\text{rat}}.} 1635: 1409:
because it has a multiplication operation given by the
1003:{\displaystyle Z_{r}(X)_{\text{rat}}\subseteq Z_{r}(X)} 1891: 1794: 1680: 1573: 1526: 1497: 1471: 1423: 1377: 1319: 1261: 1160: 1118: 1023: 951: 908: 840: 784: 764: 737: 705: 679: 655: 618: 528: 441: 351: 229: 190: 154: 107: 2090:, Annals of Mathematics Studies 187, February 2014, 1014:-cycles modulo rational equivalence is the quotient 2148:, Providence, R.I.: American Mathematical Society, 1616:. Other equivalence relations of interest include 2021: 1848: 1751: 1597: 1559: 1512: 1483: 1441: 1393: 1360: 1299: 1241:if they can be represented by an effective cycle. 1214: 1143: 1101: 1002: 928: 894: 826: 770: 750: 723: 691: 661: 634: 573: 496: 383: 251: 215: 176: 132: 2018: 1845: 1748: 507:where the sum is over closed integral subschemes 290:yield enough cycles to construct his category of 2163: 2116:Ergebnisse der Mathematik und ihrer Grenzgebiete 1762:which by assumption has the same codimension as 1215:{\displaystyle A_{*}(X)=\bigoplus _{r}A_{r}(X)} 936:denotes the divisor of a rational function on 1248:is smooth, projective, and of pure dimension 2071:Rational equivalence of 0-cycles on surfaces 929:{\displaystyle \operatorname {div} _{W_{i}}} 574:{\displaystyle Z_{*}X=\bigoplus _{r}Z_{r}X.} 827:{\displaystyle r_{i}\in k(W_{i})^{\times }} 1144:{\displaystyle \operatorname {CH} _{r}(X)} 600:if all its coefficients are non-negative. 216:{\displaystyle \operatorname {CH} ^{2}(S)} 133:{\displaystyle \operatorname {CH} ^{2}(S)} 2017: 1844: 1747: 1614:equivalence relations on algebraic cycles 1560:{\displaystyle k({\overline {\phi (Y)}})} 288:standard conjectures on algebraic cycles 101:, the analogous statement for the group 14: 2164: 2106: 1598:{\displaystyle {\overline {\phi (Y)}}} 1636:Flat pullback and proper pushforward 1453:is a regular Noetherian scheme. An 515:. The groups of cycles for varying 81:example, every curve has a constant 24: 1863:is the degree of the extension of 1442:{\displaystyle \phi \colon X\to S} 699:, if there are a finite number of 432:-cycles is the free abelian group 326:which is finite type over a field 146:Lefschetz theorem on (1,1)-classes 42:is a formal linear combination of 25: 2183: 1785:the pushforward is defined to be 1465:; here the relative dimension of 1361:{\displaystyle A^{N-r}X=A_{r}X.} 1233:. Cycle classes are said to be 778:and non-zero rational functions 475: 1957: 1951: 1491:is the transcendence degree of 1300:{\displaystyle Z^{N-r}X=Z_{r}X} 588:, and any element is called an 342:is a formal linear combination 278:makes a similar prediction for 2080: 2063: 2014: 2003: 1990: 1987: 1981: 1948: 1942: 1929: 1926: 1915: 1841: 1838: 1832: 1826: 1817: 1814: 1808: 1805: 1744: 1741: 1730: 1714: 1708: 1705: 1694: 1691: 1586: 1580: 1554: 1545: 1539: 1530: 1507: 1501: 1433: 1209: 1203: 1177: 1171: 1138: 1132: 1087: 1080: 1062: 1056: 1040: 1034: 997: 991: 969: 962: 889: 886: 873: 850: 815: 801: 718: 706: 603:Closed integral subschemes of 488: 482: 378: 365: 246: 240: 210: 204: 171: 165: 127: 121: 13: 1: 2056: 1849:{\displaystyle f_{*}()=n\,\!} 895:{\displaystyle \alpha =\sum } 692:{\displaystyle \alpha \sim 0} 671:rationally equivalent to zero 398:-dimensional closed integral 313: 50:. These are the part of the 2046:divisor (algebraic geometry) 1752:{\displaystyle f^{*}()=\,\!} 1590: 1549: 1484:{\displaystyle Y\subseteq X} 1461:whose relative dimension is 148:) that the cohomology group 7: 2039: 1112:This group is also denoted 10: 2188: 731:-dimensional subvarieties 384:{\displaystyle \sum n_{i}} 268:Clay Mathematics Institute 1567:minus the codimension of 1151:. Elements of the group 586:group of algebraic cycles 272:Millennium Prize Problems 2073:, J. Math. Kyoto Univ. 252:{\displaystyle H^{2}(S)} 177:{\displaystyle H^{2}(S)} 1652:be a map of varieties. 1622:homological equivalence 662:{\displaystyle \alpha } 2023: 1867:if the restriction of 1850: 1753: 1599: 1561: 1514: 1485: 1443: 1395: 1394:{\displaystyle A^{*}X} 1362: 1301: 1216: 1145: 1103: 1004: 930: 896: 828: 772: 752: 725: 693: 663: 636: 635:{\displaystyle Z_{*}X} 575: 519:together form a group 498: 385: 284:Alexander Grothendieck 253: 217: 178: 134: 2024: 1851: 1754: 1626:numerical equivalence 1618:algebraic equivalence 1600: 1562: 1515: 1486: 1444: 1396: 1363: 1302: 1217: 1146: 1104: 1005: 931: 897: 829: 773: 753: 751:{\displaystyle W_{i}} 726: 724:{\displaystyle (r+1)} 694: 664: 637: 576: 499: 386: 254: 218: 179: 135: 1889: 1792: 1678: 1571: 1524: 1513:{\displaystyle k(Y)} 1495: 1469: 1421: 1411:intersection product 1375: 1317: 1259: 1158: 1116: 1021: 949: 906: 838: 782: 762: 735: 703: 677: 653: 616: 526: 439: 349: 227: 188: 152: 105: 2112:Intersection theory 1010:, and the group of 584:This is called the 406:. The coefficient 296:Alexander Beilinson 2172:Algebraic geometry 2077:-2 (1969) 195–204. 2019: 1846: 1749: 1595: 1557: 1510: 1481: 1439: 1391: 1358: 1297: 1212: 1192: 1141: 1099: 1000: 926: 892: 824: 768: 748: 721: 689: 659: 632: 571: 554: 494: 473: 428:. The set of all 381: 249: 213: 174: 130: 52:algebraic topology 2155:978-0-8218-1954-8 2129:978-0-387-98549-7 1955: 1879:and 0 otherwise. 1593: 1552: 1183: 1093: 975: 771:{\displaystyle X} 545: 458: 310:-theory sheaves. 37:algebraic variety 16:(Redirected from 2179: 2158: 2140: 2099: 2086:Voisin, Claire, 2084: 2078: 2069:Mumford, David, 2067: 2028: 2026: 2025: 2020: 2013: 2002: 2001: 1980: 1979: 1967: 1966: 1956: 1953: 1941: 1940: 1925: 1914: 1913: 1901: 1900: 1855: 1853: 1852: 1847: 1804: 1803: 1781:a subvariety of 1758: 1756: 1755: 1750: 1740: 1729: 1728: 1704: 1690: 1689: 1604: 1602: 1601: 1596: 1594: 1589: 1575: 1566: 1564: 1563: 1558: 1553: 1548: 1534: 1519: 1517: 1516: 1511: 1490: 1488: 1487: 1482: 1448: 1446: 1445: 1440: 1400: 1398: 1397: 1392: 1387: 1386: 1367: 1365: 1364: 1359: 1351: 1350: 1335: 1334: 1306: 1304: 1303: 1298: 1293: 1292: 1277: 1276: 1221: 1219: 1218: 1213: 1202: 1201: 1191: 1170: 1169: 1150: 1148: 1147: 1142: 1128: 1127: 1108: 1106: 1105: 1100: 1095: 1094: 1091: 1079: 1078: 1069: 1055: 1054: 1033: 1032: 1009: 1007: 1006: 1001: 990: 989: 977: 976: 973: 961: 960: 935: 933: 932: 927: 925: 924: 923: 922: 901: 899: 898: 893: 885: 884: 869: 868: 867: 866: 833: 831: 830: 825: 823: 822: 813: 812: 794: 793: 777: 775: 774: 769: 757: 755: 754: 749: 747: 746: 730: 728: 727: 722: 698: 696: 695: 690: 668: 666: 665: 660: 641: 639: 638: 633: 628: 627: 580: 578: 577: 572: 564: 563: 553: 538: 537: 503: 501: 500: 495: 478: 472: 451: 450: 390: 388: 387: 382: 377: 376: 364: 363: 280:Ă©tale cohomology 264:Hodge conjecture 258: 256: 255: 250: 239: 238: 222: 220: 219: 214: 200: 199: 183: 181: 180: 175: 164: 163: 139: 137: 136: 131: 117: 116: 75:projective space 67:algebraic curves 21: 18:Algebraic cycles 2187: 2186: 2182: 2181: 2180: 2178: 2177: 2176: 2162: 2161: 2156: 2130: 2120:Springer-Verlag 2108:Fulton, William 2103: 2102: 2085: 2081: 2068: 2064: 2059: 2042: 2006: 1997: 1993: 1975: 1971: 1962: 1958: 1952: 1936: 1932: 1918: 1909: 1905: 1896: 1892: 1890: 1887: 1886: 1865:function fields 1799: 1795: 1793: 1790: 1789: 1769:Conversely, if 1733: 1721: 1717: 1697: 1685: 1681: 1679: 1676: 1675: 1638: 1576: 1574: 1572: 1569: 1568: 1535: 1533: 1525: 1522: 1521: 1496: 1493: 1492: 1470: 1467: 1466: 1422: 1419: 1418: 1382: 1378: 1376: 1373: 1372: 1346: 1342: 1324: 1320: 1318: 1315: 1314: 1288: 1284: 1266: 1262: 1260: 1257: 1256: 1197: 1193: 1187: 1165: 1161: 1159: 1156: 1155: 1123: 1119: 1117: 1114: 1113: 1090: 1086: 1074: 1070: 1065: 1050: 1046: 1028: 1024: 1022: 1019: 1018: 985: 981: 972: 968: 956: 952: 950: 947: 946: 944: 918: 914: 913: 909: 907: 904: 903: 880: 876: 862: 858: 857: 853: 839: 836: 835: 818: 814: 808: 804: 789: 785: 783: 780: 779: 763: 760: 759: 742: 738: 736: 733: 732: 704: 701: 700: 678: 675: 674: 654: 651: 650: 623: 619: 617: 614: 613: 590:algebraic cycle 559: 555: 549: 533: 529: 527: 524: 523: 474: 462: 446: 442: 440: 437: 436: 427: 414: 402:-subschemes of 372: 368: 359: 355: 350: 347: 346: 316: 276:Tate conjecture 234: 230: 228: 225: 224: 195: 191: 189: 186: 185: 159: 155: 153: 150: 149: 112: 108: 106: 103: 102: 99:geometric genus 71:Riemann surface 33:algebraic cycle 23: 22: 15: 12: 11: 5: 2185: 2175: 2174: 2160: 2159: 2154: 2141: 2128: 2101: 2100: 2079: 2061: 2060: 2058: 2055: 2054: 2053: 2051:Relative cycle 2048: 2041: 2038: 2030: 2029: 2016: 2012: 2009: 2005: 2000: 1996: 1992: 1989: 1986: 1983: 1978: 1974: 1970: 1965: 1961: 1950: 1947: 1944: 1939: 1935: 1931: 1928: 1924: 1921: 1917: 1912: 1908: 1904: 1899: 1895: 1857: 1856: 1843: 1840: 1837: 1834: 1831: 1828: 1825: 1822: 1819: 1816: 1813: 1810: 1807: 1802: 1798: 1760: 1759: 1746: 1743: 1739: 1736: 1732: 1727: 1724: 1720: 1716: 1713: 1710: 1707: 1703: 1700: 1696: 1693: 1688: 1684: 1637: 1634: 1592: 1588: 1585: 1582: 1579: 1556: 1551: 1547: 1544: 1541: 1538: 1532: 1529: 1509: 1506: 1503: 1500: 1480: 1477: 1474: 1438: 1435: 1432: 1429: 1426: 1401:is called the 1390: 1385: 1381: 1371:In this case, 1369: 1368: 1357: 1354: 1349: 1345: 1341: 1338: 1333: 1330: 1327: 1323: 1308: 1307: 1296: 1291: 1287: 1283: 1280: 1275: 1272: 1269: 1265: 1223: 1222: 1211: 1208: 1205: 1200: 1196: 1190: 1186: 1182: 1179: 1176: 1173: 1168: 1164: 1140: 1137: 1134: 1131: 1126: 1122: 1110: 1109: 1098: 1089: 1085: 1082: 1077: 1073: 1068: 1064: 1061: 1058: 1053: 1049: 1045: 1042: 1039: 1036: 1031: 1027: 999: 996: 993: 988: 984: 980: 971: 967: 964: 959: 955: 940: 921: 917: 912: 891: 888: 883: 879: 875: 872: 865: 861: 856: 852: 849: 846: 843: 821: 817: 811: 807: 803: 800: 797: 792: 788: 767: 745: 741: 720: 717: 714: 711: 708: 688: 685: 682: 658: 631: 626: 622: 592:. A cycle is 582: 581: 570: 567: 562: 558: 552: 548: 544: 541: 536: 532: 505: 504: 493: 490: 487: 484: 481: 477: 471: 468: 465: 461: 457: 454: 449: 445: 423: 410: 392: 391: 380: 375: 371: 367: 362: 358: 354: 315: 312: 248: 245: 242: 237: 233: 212: 209: 206: 203: 198: 194: 173: 170: 167: 162: 158: 129: 126: 123: 120: 115: 111: 97:with positive 9: 6: 4: 3: 2: 2184: 2173: 2170: 2169: 2167: 2157: 2151: 2147: 2142: 2139: 2135: 2131: 2125: 2121: 2117: 2113: 2109: 2105: 2104: 2097: 2096:9780691160504 2093: 2089: 2083: 2076: 2072: 2066: 2062: 2052: 2049: 2047: 2044: 2043: 2037: 2035: 2010: 2007: 1998: 1994: 1984: 1976: 1972: 1968: 1963: 1959: 1945: 1937: 1933: 1922: 1919: 1910: 1906: 1902: 1897: 1893: 1885: 1884: 1883: 1880: 1878: 1874: 1870: 1866: 1862: 1835: 1829: 1823: 1820: 1811: 1800: 1796: 1788: 1787: 1786: 1784: 1780: 1776: 1772: 1767: 1765: 1737: 1734: 1725: 1722: 1718: 1711: 1701: 1698: 1686: 1682: 1674: 1673: 1672: 1670: 1667: âŠ‚  1666: 1662: 1658: 1653: 1651: 1647: 1643: 1633: 1631: 1627: 1623: 1619: 1615: 1610: 1608: 1583: 1577: 1542: 1536: 1527: 1504: 1498: 1478: 1475: 1472: 1464: 1460: 1456: 1452: 1436: 1430: 1427: 1424: 1414: 1412: 1408: 1404: 1388: 1383: 1379: 1355: 1352: 1347: 1343: 1339: 1336: 1331: 1328: 1325: 1321: 1313: 1312: 1311: 1294: 1289: 1285: 1281: 1278: 1273: 1270: 1267: 1263: 1255: 1254: 1253: 1251: 1247: 1242: 1240: 1236: 1232: 1228: 1227:cycle classes 1206: 1198: 1194: 1188: 1184: 1180: 1174: 1166: 1162: 1154: 1153: 1152: 1135: 1129: 1124: 1120: 1096: 1083: 1075: 1071: 1066: 1059: 1051: 1047: 1043: 1037: 1029: 1025: 1017: 1016: 1015: 1013: 994: 986: 982: 978: 965: 957: 953: 943: 939: 919: 915: 910: 881: 877: 870: 863: 859: 854: 847: 844: 841: 819: 809: 805: 798: 795: 790: 786: 765: 743: 739: 715: 712: 709: 686: 683: 680: 672: 656: 647: 645: 629: 624: 620: 610: 606: 601: 599: 595: 591: 587: 568: 565: 560: 556: 550: 546: 542: 539: 534: 530: 522: 521: 520: 518: 514: 510: 491: 485: 479: 469: 466: 463: 459: 455: 452: 447: 443: 435: 434: 433: 431: 426: 422: 418: 413: 409: 405: 401: 397: 373: 369: 360: 356: 352: 345: 344: 343: 341: 337: 335: 329: 325: 321: 311: 309: 305: 303: 297: 293: 289: 285: 281: 277: 273: 269: 266:, one of the 265: 260: 243: 235: 231: 207: 201: 196: 192: 168: 160: 156: 147: 143: 124: 118: 113: 109: 100: 96: 92: 91:David Mumford 88: 84: 78: 76: 72: 68: 64: 59: 57: 53: 49: 45: 41: 38: 34: 30: 19: 2145: 2111: 2087: 2082: 2074: 2070: 2065: 2031: 1881: 1872: 1868: 1860: 1858: 1782: 1778: 1770: 1768: 1763: 1761: 1668: 1664: 1656: 1654: 1649: 1645: 1641: 1639: 1625: 1621: 1617: 1611: 1606: 1462: 1458: 1454: 1450: 1415: 1406: 1370: 1309: 1249: 1245: 1243: 1238: 1234: 1230: 1226: 1224: 1111: 1011: 941: 937: 670: 648: 643: 608: 604: 602: 597: 593: 589: 585: 583: 516: 512: 508: 506: 429: 424: 420: 417:multiplicity 416: 411: 407: 403: 399: 395: 393: 339: 333: 331: 327: 319: 317: 307: 301: 261: 141: 94: 86: 82: 79: 60: 55: 47: 44:subvarieties 39: 32: 26: 1225:are called 29:mathematics 2057:References 834:such that 673:, written 332:algebraic 314:Definition 300:algebraic 2034:Chow ring 1991:→ 1969:: 1964:∗ 1930:→ 1903:: 1898:∗ 1801:∗ 1723:− 1687:∗ 1591:¯ 1578:ϕ 1550:¯ 1537:ϕ 1476:⊆ 1434:→ 1428:: 1425:ϕ 1403:Chow ring 1384:∗ 1329:− 1271:− 1235:effective 1185:⨁ 1167:∗ 1130:⁡ 979:⊆ 871:⁡ 848:∑ 842:α 820:× 796:∈ 684:∼ 681:α 657:α 625:∗ 594:effective 547:⨁ 535:∗ 480:⋅ 467:⊆ 460:⨁ 353:∑ 202:⁡ 119:⁡ 2166:Category 2110:(1998), 2040:See also 2011:′ 1923:′ 1764:Y′ 1738:′ 1702:′ 1644: : 1449:, where 1239:positive 902:, where 649:A cycle 598:positive 63:divisors 2138:1644323 1630:motives 415:is the 304:-theory 292:motives 2152:  2136:  2126:  2094:  1877:finite 1859:where 1777:, for 1775:proper 336:-cycle 330:. An 324:scheme 35:on an 1520:over 322:be a 31:, an 2150:ISBN 2124:ISBN 2092:ISBN 1661:flat 1310:and 318:Let 1954:and 1875:is 1871:to 1773:is 1659:is 1655:If 1605:in 1405:of 1244:If 1237:or 1229:on 1092:rat 974:rat 911:div 855:div 758:of 669:is 596:or 511:of 419:of 394:of 338:on 286:'s 282:. 270:'s 89:. 54:of 46:of 27:In 2168:: 2134:MR 2132:, 2122:, 2114:, 1766:. 1671:: 1669:X' 1665:Y' 1650:X' 1648:→ 1632:. 1620:, 1609:. 1413:. 1121:CH 646:. 193:CH 110:CH 77:. 2098:. 2075:9 2015:) 2008:X 2004:( 1999:k 1995:Z 1988:) 1985:X 1982:( 1977:k 1973:Z 1960:f 1949:) 1946:X 1943:( 1938:k 1934:Z 1927:) 1920:X 1916:( 1911:k 1907:Z 1894:f 1873:Y 1869:f 1861:n 1842:] 1839:) 1836:Y 1833:( 1830:f 1827:[ 1824:n 1821:= 1818:) 1815:] 1812:Y 1809:[ 1806:( 1797:f 1783:X 1779:Y 1771:f 1745:] 1742:) 1735:Y 1731:( 1726:1 1719:f 1715:[ 1712:= 1709:) 1706:] 1699:Y 1695:[ 1692:( 1683:f 1657:f 1646:X 1642:f 1607:S 1587:) 1584:Y 1581:( 1555:) 1546:) 1543:Y 1540:( 1531:( 1528:k 1508:) 1505:Y 1502:( 1499:k 1479:X 1473:Y 1463:r 1459:X 1455:r 1451:S 1437:S 1431:X 1407:X 1389:X 1380:A 1356:. 1353:X 1348:r 1344:A 1340:= 1337:X 1332:r 1326:N 1322:A 1295:X 1290:r 1286:Z 1282:= 1279:X 1274:r 1268:N 1264:Z 1250:N 1246:X 1231:X 1210:) 1207:X 1204:( 1199:r 1195:A 1189:r 1181:= 1178:) 1175:X 1172:( 1163:A 1139:) 1136:X 1133:( 1125:r 1097:. 1088:) 1084:X 1081:( 1076:r 1072:Z 1067:/ 1063:) 1060:X 1057:( 1052:r 1048:Z 1044:= 1041:) 1038:X 1035:( 1030:r 1026:A 1012:r 998:) 995:X 992:( 987:r 983:Z 970:) 966:X 963:( 958:r 954:Z 942:i 938:W 920:i 916:W 890:] 887:) 882:i 878:r 874:( 864:i 860:W 851:[ 845:= 816:) 810:i 806:W 802:( 799:k 791:i 787:r 766:X 744:i 740:W 719:) 716:1 713:+ 710:r 707:( 687:0 644:X 630:X 621:Z 609:X 605:X 569:. 566:X 561:r 557:Z 551:r 543:= 540:X 531:Z 517:r 513:X 509:V 492:, 489:] 486:V 483:[ 476:Z 470:X 464:V 456:= 453:X 448:r 444:Z 430:r 425:i 421:V 412:i 408:n 404:X 400:k 396:r 379:] 374:i 370:V 366:[ 361:i 357:n 340:X 334:r 328:k 320:X 308:K 302:K 247:) 244:S 241:( 236:2 232:H 211:) 208:S 205:( 197:2 172:) 169:S 166:( 161:2 157:H 142:S 128:) 125:S 122:( 114:2 95:S 87:N 83:N 56:V 48:V 40:V 20:)

Index

Algebraic cycles
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

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