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Quasiconformal mapping

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Recently, quasi-conformal geometry has attracted attention from different fields, such as applied mathematics, computer vision and medical imaging. Computational quasi-conformal geometry has been developed, which extends the quasi-conformal theory into a discrete setting. It has found various
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Papadopoulos, Athanase, ed. (2009), Handbook of Teichmüller theory. Vol. II, IRMA Lectures in Mathematics and Theoretical Physics, 13, European Mathematical Society (EMS), Zürich,
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Papadopoulos, Athanase, ed. (2007), Handbook of Teichmüller theory. Vol. I, IRMA Lectures in Mathematics and Theoretical Physics, 11, European Mathematical Society (EMS), Zürich,
1280: 846:{\displaystyle (1+|\mu |)^{2}\textstyle {\left|{\frac {\partial f}{\partial z}}\right|^{2}},\qquad (1-|\mu |)^{2}\textstyle {\left|{\frac {\partial f}{\partial z}}\right|^{2}}.} 536: 301: 679: 1960: 163: 998: 1720: 1836: 320: 2053: 2027: 1674: 1412:
The space of K-quasiconformal mappings from the complex plane to itself mapping three distinct points to three given points is compact.
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The eigenvalues represent, respectively, the squared length of the major and minor axis of the ellipse obtained by pulling back along
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Berichte über die Verhandlungen der Königlich Sächsischen Gesellschaft der Wissenschaften zu Leipzig. Mathematisch-Physische Classe
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A homeomorphism is 1-quasiconformal if and only if it is conformal. Hence the identity map is always 1-quasiconformal. If
2095: 2073: 86: 2105: 480: 74: 1293: 1912:, Die Grundlehren der mathematischen Wissenschaften, vol. 126 (2nd ed.), Berlin–Heidelberg–New York: 1718:(1977), "Quasiconformal mappings, with applications to differential equations, function theory and topology", 2068: 1490: 2100: 1584: 1460: 633:{\displaystyle \left|{\frac {\partial f}{\partial z}}\right|^{2}\left|\,dz+\mu (z)\,d{\bar {z}}\right|^{2}} 1955: 1594: 1574: 1238: 1765: 267: 1878: 1589: 1803: 1484: 646: 261: 142: 237:{\displaystyle {\frac {\partial f}{\partial {\bar {z}}}}=\mu (z){\frac {\partial f}{\partial z}},} 1987: 145: 1866: 2049: 2023: 1944: 1917: 1896: 1773: 1769: 1670: 1631: 153: 2041: 2015: 2003: 1979: 1969: 1935: 1886: 1853: 1815: 1791: 1729: 1704: 1688: 1647: 1639: 1621: 1612: 1579: 51: 31: 2060: 2034: 1999: 1931: 1849: 1787: 1743: 1700: 1684: 1104:{\displaystyle K=\sup _{z\in D}|K(z)|={\frac {1+\|\mu \|_{\infty }}{1-\|\mu \|_{\infty }}}} 2057: 2031: 2007: 1995: 1983: 1939: 1927: 1913: 1857: 1845: 1819: 1795: 1783: 1739: 1708: 1697: 1692: 1680: 1651: 1643: 1122: 133:. There are a variety of equivalent definitions, depending on the required smoothness of 1828: 1882: 1463:
from conformal to quasiconformal homeomorphisms, and is stated as follows. Suppose that
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Of central importance in the theory of quasiconformal mappings in two dimensions is the
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Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
1607: 1409:-quasiconformal. The set of 1-quasiconformal maps forms a group under composition. 1350:≠ 0, this is an example of a quasiconformal homeomorphism that is not smooth. If 1752: 1660: 1715: 1565:
important applications in medical image analysis, computer vision and graphics.
682: 420:{\displaystyle ds^{2}=\Omega (z)^{2}\left|\,dz+\mu (z)\,d{\bar {z}}\right|^{2},} 54:
domains which to first order takes small circles to small ellipses of bounded
17: 1900: 1635: 1761: 1665:, University Lecture Series, vol. 38 (2nd ed.), Providence, R.I.: 1891: 981: 484: 78: 1806:(1928), "Über einige Extremalprobleme der konformen Abbildung. I, II.", 1991: 1626: 1459:, proved by Lars Ahlfors and Lipman Bers. The theorem generalizes the 55: 530:
of the usual Euclidean metric. The resulting metric is then given by
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at every point maps circles to ellipses with eccentricity bounded by
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Without appeal to an auxiliary metric, consider the effect of the
2045: 2019: 1867:"Planar morphometry, shear and optimal quasi-conformal mappings" 1414: 452:′ equipped with the standard Euclidean metric. The function 307:). This equation admits a geometrical interpretation. Equip 505:). When μ is zero almost everywhere, any homeomorphism in 970:{\displaystyle K(z)={\frac {1+|\mu (z)|}{1-|\mu (z)|}}.} 1431: 460:. More generally, the continuous differentiability of 444:) precisely when it is a conformal transformation from 800: 726: 1542:) and satisfies the corresponding Beltrami equation ( 1493: 1296: 1241: 1224:
are both quasiconformal and have constant dilatation
1001: 884: 693: 649: 539: 323: 270: 166: 643:which, relative to the background Euclidean metric 1518: 1338: 1274: 1103: 969: 845: 673: 632: 419: 295: 236: 1961:Transactions of the American Mathematical Society 1610:(1935), "Zur Theorie der Überlagerungsflächen", 1297: 1009: 271: 1534:to the unit disk which is in the Sobolev space 1526:. Then there is a quasiconformal homeomorphism 1721:Bulletin of the American Mathematical Society 464:can be replaced by the weaker condition that 8: 1837:Notices of the American Mathematical Society 1501: 1494: 1089: 1082: 1065: 1058: 152:is quasiconformal provided it satisfies the 1757:–Dimensional Quasiconformal (QCf) Mappings 1552:. As with Riemann's mapping theorem, this 1339:{\displaystyle \max(1+s,{\frac {1}{1+s}})} 1973: 1890: 1865:Jones, Gareth Wyn; Mahadevan, L. (2013), 1733: 1625: 1504: 1492: 1315: 1295: 1266: 1261: 1252: 1251: 1240: 1149: o γ : γ ∈  1092: 1068: 1049: 1041: 1024: 1012: 1000: 956: 939: 926: 909: 900: 883: 831: 807: 801: 794: 785: 777: 757: 733: 727: 720: 711: 703: 692: 660: 659: 648: 624: 608: 607: 603: 581: 569: 545: 538: 408: 392: 391: 387: 365: 353: 331: 322: 282: 274: 269: 211: 182: 181: 167: 165: 448:equipped with this metric to the domain 39: 1829:"What Is ... a Quasiconformal Mapping?" 1519:{\displaystyle \|\mu \|_{\infty }<1} 43: 1560:Computational quasi-conformal geometry 1354:= 0, this is simply the identity map. 860:the unit circle in the tangent plane. 1114:and is called the dilatation of  93:-quasiconformal if the derivative of 7: 1910:Quasiconformal mappings in the plane 1125:is as follows. If there is a finite 1121:A definition based on the notion of 304: 157: 1908:Lehto, O.; Virtanen, K. I. (1973), 1662:Lectures on quasiconformal mappings 1556:is unique up to 3 real parameters. 1401:′-quasiconformal. The inverse of a 1275:{\displaystyle z\mapsto z\,|z|^{s}} 27:Homeomorphism between plane domains 1505: 1457:measurable Riemann mapping theorem 1451:Measurable Riemann mapping theorem 1093: 1069: 818: 810: 744: 736: 556: 548: 340: 222: 214: 178: 170: 77:-preserving homeomorphism between 25: 1696:, (reviews of the first edition: 1405:-quasiconformal homeomorphism is 479:) of functions whose first-order 1827:Heinonen, Juha (December 2006), 1467:is a simply connected domain in 1418: 1172:-quasiconformal for some finite 296:{\displaystyle \sup |\mu |<1} 1735:10.1090/S0002-9904-1977-14390-5 1129:such that for every collection 767: 46:, is a (weakly differentiable) 1333: 1300: 1290:) and has constant dilatation 1262: 1253: 1245: 1145:times the extremal length of { 1042: 1038: 1032: 1025: 957: 953: 947: 940: 927: 923: 917: 910: 894: 888: 791: 786: 778: 768: 717: 712: 704: 694: 665: 613: 600: 594: 513:) that is a weak solution of ( 397: 384: 378: 350: 343: 283: 275: 208: 202: 187: 1: 1772:/ Abacus Press, p. 553, 1667:American Mathematical Society 674:{\displaystyle dzd{\bar {z}}} 1475:, and suppose that μ : 2074:Encyclopedia of Mathematics 1544: 515: 501: 440: 87:continuously differentiable 2122: 1659:Ahlfors, Lars V. (2006) , 481:distributional derivatives 434:) > 0. Then 2069:"Quasi-conformal mapping" 1751:Caraman, Petru (1974) , 1282:is quasiconformal (here 260:for some complex valued 2067:Zorich, V. A. (2001) , 1585:Pseudoanalytic function 1461:Riemann mapping theorem 1389:′-quasiconformal, then 1137:the extremal length of 1956:Morrey, Charles B. Jr. 1892:10.1098/rspa.2012.0653 1575:Isothermal coordinates 1520: 1340: 1276: 1105: 971: 847: 675: 634: 421: 297: 238: 36:quasiconformal mapping 1916:, pp. VIII+258, 1766:Tunbridge Wells, Kent 1521: 1471:that is not equal to 1341: 1277: 1235:> −1 then the map 1192:> 1 then the maps 1106: 972: 848: 676: 635: 422: 298: 239: 129:′ are two domains in 1814:: 367–376, 497–502, 1760:(revised ed.), 1550:distributional sense 1491: 1373:-quasiconformal and 1294: 1239: 999: 882: 691: 647: 537: 495:is required to be a 321: 268: 164: 1943:(also available as 1883:2013RSPSA.46920653J 1595:Tissot's indicatrix 1485:Lebesgue measurable 1180:is quasiconformal. 262:Lebesgue measurable 146:partial derivatives 141:is assumed to have 2096:Conformal mappings 1877:(2153): 20120653, 1627:10.1007/BF02420945 1516: 1430:. You can help by 1336: 1272: 1101: 1023: 967: 843: 842: 841: 671: 630: 417: 293: 234: 2054:978-3-03719-055-5 2028:978-3-03719-029-6 1844:(11): 1334–1335, 1804:Grötzsch, Herbert 1770:Editura Academiei 1676:978-0-8218-3644-6 1590:Teichmüller space 1448: 1447: 1331: 1161:-quasiconformal. 1099: 1008: 962: 863:Accordingly, the 825: 751: 668: 616: 563: 400: 258: 257: 229: 194: 190: 154:Beltrami equation 81:in the plane. If 61:Intuitively, let 16:(Redirected from 2113: 2106:Complex analysis 2081: 2010: 1977: 1942: 1903: 1894: 1860: 1833: 1822: 1798: 1746: 1737: 1728:(6): 1083–1100, 1695: 1654: 1629: 1613:Acta Mathematica 1580:Quasiregular map 1525: 1523: 1522: 1517: 1509: 1508: 1443: 1440: 1422: 1415: 1345: 1343: 1342: 1337: 1332: 1330: 1316: 1281: 1279: 1278: 1273: 1271: 1270: 1265: 1256: 1110: 1108: 1107: 1102: 1100: 1098: 1097: 1096: 1074: 1073: 1072: 1050: 1045: 1028: 1022: 980:The (essential) 976: 974: 973: 968: 963: 961: 960: 943: 931: 930: 913: 901: 852: 850: 849: 844: 837: 836: 835: 830: 826: 824: 816: 808: 799: 798: 789: 781: 763: 762: 761: 756: 752: 750: 742: 734: 725: 724: 715: 707: 680: 678: 677: 672: 670: 669: 661: 639: 637: 636: 631: 629: 628: 623: 619: 618: 617: 609: 574: 573: 568: 564: 562: 554: 546: 519:) is conformal. 491:. In this case, 426: 424: 423: 418: 413: 412: 407: 403: 402: 401: 393: 358: 357: 336: 335: 302: 300: 299: 294: 286: 278: 252: 243: 241: 240: 235: 230: 228: 220: 212: 195: 193: 192: 191: 183: 176: 168: 158: 38:, introduced by 32:complex analysis 30:In mathematical 21: 2121: 2120: 2116: 2115: 2114: 2112: 2111: 2110: 2086: 2085: 2066: 1975:10.2307/1989904 1954: 1924: 1914:Springer Verlag 1907: 1864: 1831: 1826: 1802: 1780: 1750: 1714: 1677: 1658: 1606: 1603: 1571: 1562: 1500: 1489: 1488: 1453: 1444: 1438: 1435: 1428:needs expansion 1320: 1292: 1291: 1260: 1237: 1236: 1186: 1123:extremal length 1088: 1075: 1064: 1051: 997: 996: 932: 902: 880: 879: 817: 809: 803: 802: 790: 743: 735: 729: 728: 716: 689: 688: 645: 644: 580: 576: 575: 555: 547: 541: 540: 535: 534: 456:is then called 364: 360: 359: 349: 327: 319: 318: 266: 265: 250: 221: 213: 177: 169: 162: 161: 107: 40:Grötzsch (1928) 28: 23: 22: 15: 12: 11: 5: 2119: 2117: 2109: 2108: 2103: 2101:Homeomorphisms 2098: 2088: 2087: 2084: 2083: 2064: 2038: 2012: 1968:(1): 126–166, 1952: 1922: 1905: 1862: 1824: 1800: 1778: 1748: 1712: 1675: 1656: 1620:(1): 157–194, 1602: 1599: 1598: 1597: 1592: 1587: 1582: 1577: 1570: 1567: 1561: 1558: 1515: 1512: 1507: 1503: 1499: 1496: 1487:and satisfies 1452: 1449: 1446: 1445: 1425: 1423: 1335: 1329: 1326: 1323: 1319: 1314: 1311: 1308: 1305: 1302: 1299: 1288:complex number 1269: 1264: 1259: 1255: 1250: 1247: 1244: 1185: 1182: 1112: 1111: 1095: 1091: 1087: 1084: 1081: 1078: 1071: 1067: 1063: 1060: 1057: 1054: 1048: 1044: 1040: 1037: 1034: 1031: 1027: 1021: 1018: 1015: 1011: 1007: 1004: 992:) is given by 978: 977: 966: 959: 955: 952: 949: 946: 942: 938: 935: 929: 925: 922: 919: 916: 912: 908: 905: 899: 896: 893: 890: 887: 875:is defined by 854: 853: 840: 834: 829: 823: 820: 815: 812: 806: 797: 793: 788: 784: 780: 776: 773: 770: 766: 760: 755: 749: 746: 741: 738: 732: 723: 719: 714: 710: 706: 702: 699: 696: 667: 664: 658: 655: 652: 641: 640: 627: 622: 615: 612: 606: 602: 599: 596: 593: 590: 587: 584: 579: 572: 567: 561: 558: 553: 550: 544: 428: 427: 416: 411: 406: 399: 396: 390: 386: 383: 380: 377: 374: 371: 368: 363: 356: 352: 348: 345: 342: 339: 334: 330: 326: 292: 289: 285: 281: 277: 273: 256: 255: 246: 244: 233: 227: 224: 219: 216: 210: 207: 204: 201: 198: 189: 186: 180: 175: 172: 106: 103: 44:Ahlfors (1935) 26: 24: 18:Quasiconformal 14: 13: 10: 9: 6: 4: 3: 2: 2118: 2107: 2104: 2102: 2099: 2097: 2094: 2093: 2091: 2080: 2076: 2075: 2070: 2065: 2062: 2059: 2055: 2051: 2047: 2043: 2039: 2036: 2033: 2029: 2025: 2021: 2017: 2013: 2009: 2005: 2001: 1997: 1993: 1989: 1985: 1981: 1976: 1971: 1967: 1963: 1962: 1957: 1953: 1950: 1949:0-387-03303-3 1946: 1941: 1937: 1933: 1929: 1925: 1923:3-540-03303-3 1919: 1915: 1911: 1906: 1902: 1898: 1893: 1888: 1884: 1880: 1876: 1872: 1868: 1863: 1859: 1855: 1851: 1847: 1843: 1839: 1838: 1830: 1825: 1821: 1817: 1813: 1810:(in German), 1809: 1805: 1801: 1797: 1793: 1789: 1785: 1781: 1779:0-85626-005-3 1775: 1771: 1767: 1763: 1759: 1758: 1754: 1749: 1745: 1741: 1736: 1731: 1727: 1723: 1722: 1717: 1713: 1710: 1706: 1702: 1699: 1694: 1690: 1686: 1682: 1678: 1672: 1668: 1664: 1663: 1657: 1653: 1649: 1645: 1641: 1637: 1633: 1628: 1623: 1619: 1616:(in German), 1615: 1614: 1609: 1608:Ahlfors, Lars 1605: 1604: 1600: 1596: 1593: 1591: 1588: 1586: 1583: 1581: 1578: 1576: 1573: 1572: 1568: 1566: 1559: 1557: 1555: 1551: 1547: 1546: 1541: 1537: 1533: 1529: 1513: 1510: 1497: 1486: 1482: 1478: 1474: 1470: 1466: 1462: 1458: 1450: 1442: 1433: 1429: 1426:This section 1424: 1421: 1417: 1416: 1413: 1410: 1408: 1404: 1400: 1396: 1393: o  1392: 1388: 1384: 1380: 1376: 1372: 1368: 1364: 1360: 1355: 1353: 1349: 1327: 1324: 1321: 1317: 1312: 1309: 1306: 1303: 1289: 1285: 1267: 1257: 1248: 1242: 1234: 1229: 1227: 1223: 1219: 1215: 1211: 1207: 1203: 1199: 1195: 1191: 1183: 1181: 1179: 1175: 1171: 1167: 1162: 1160: 1156: 1152: 1148: 1144: 1140: 1136: 1133:of curves in 1132: 1128: 1124: 1119: 1117: 1085: 1079: 1076: 1061: 1055: 1052: 1046: 1035: 1029: 1019: 1016: 1013: 1005: 1002: 995: 994: 993: 991: 987: 983: 964: 950: 944: 936: 933: 920: 914: 906: 903: 897: 891: 885: 878: 877: 876: 874: 870: 866: 861: 859: 838: 832: 827: 821: 813: 804: 795: 782: 774: 771: 764: 758: 753: 747: 739: 730: 721: 708: 700: 697: 687: 686: 685: 684: 662: 656: 653: 650: 625: 620: 610: 604: 597: 591: 588: 585: 582: 577: 570: 565: 559: 551: 542: 533: 532: 531: 529: 525: 520: 518: 517: 512: 508: 504: 503: 498: 497:weak solution 494: 490: 488: 482: 478: 474: 471: 470:Sobolev space 467: 463: 459: 455: 451: 447: 443: 442: 437: 433: 414: 409: 404: 394: 388: 381: 375: 372: 369: 366: 361: 354: 346: 337: 332: 328: 324: 317: 316: 315: 314: 313:metric tensor 310: 306: 290: 287: 279: 264:μ satisfying 263: 254: 247: 245: 231: 225: 217: 205: 199: 196: 184: 173: 160: 159: 156: 155: 151: 147: 144: 140: 136: 132: 128: 124: 120: 117: →  116: 112: 104: 102: 100: 96: 92: 89:, then it is 88: 84: 80: 76: 72: 69: →  68: 64: 59: 57: 53: 49: 48:homeomorphism 45: 42:and named by 41: 37: 33: 19: 2072: 1965: 1959: 1909: 1874: 1870: 1841: 1835: 1811: 1807: 1756: 1753: 1725: 1719: 1716:Bers, Lipman 1661: 1617: 1611: 1563: 1553: 1543: 1539: 1535: 1531: 1527: 1480: 1476: 1472: 1468: 1464: 1454: 1436: 1432:adding to it 1427: 1411: 1406: 1402: 1398: 1394: 1390: 1386: 1382: 1378: 1374: 1370: 1366: 1362: 1358: 1356: 1351: 1347: 1283: 1232: 1230: 1225: 1221: 1217: 1213: 1209: 1205: 1201: 1197: 1193: 1189: 1187: 1177: 1173: 1169: 1165: 1163: 1158: 1154: 1150: 1146: 1142: 1138: 1134: 1130: 1126: 1120: 1115: 1113: 989: 985: 979: 872: 868: 864: 862: 857: 855: 642: 527: 521: 514: 510: 506: 500: 492: 486: 476: 472: 465: 461: 457: 453: 449: 445: 439: 435: 431: 429: 308: 259: 248: 149: 138: 134: 130: 126: 122: 118: 114: 110: 108: 98: 94: 90: 82: 70: 66: 62: 60: 56:eccentricity 35: 29: 2046:10.4171/055 2020:10.4171/029 1141:is at most 871:at a point 683:eigenvalues 458:μ-conformal 438:satisfies ( 75:orientation 2090:Categories 2008:0018.40501 1984:62.0565.02 1940:0267.30016 1858:1142.30322 1820:54.0378.01 1796:0342.30015 1709:1103.30001 1693:1103.30001 1652:0012.17204 1644:61.0365.03 1601:References 1184:Properties 865:dilatation 468:be in the 143:continuous 105:Definition 2079:EMS Press 1901:1364-5021 1762:București 1636:0001-5962 1548:) in the 1506:∞ 1502:‖ 1498:μ 1495:‖ 1246:↦ 1094:∞ 1090:‖ 1086:μ 1083:‖ 1080:− 1070:∞ 1066:‖ 1062:μ 1059:‖ 1017:∈ 945:μ 937:− 915:μ 819:∂ 811:∂ 783:μ 775:− 745:∂ 737:∂ 709:μ 666:¯ 614:¯ 592:μ 557:∂ 549:∂ 398:¯ 376:μ 341:Ω 311:with the 305:Bers 1977 280:μ 223:∂ 215:∂ 200:μ 188:¯ 179:∂ 171:∂ 79:open sets 1569:See also 1439:May 2012 1377: : 1361: : 1153:}. Then 982:supremum 524:pullback 430:where Ω( 121:′ where 113: : 109:Suppose 73:′ be an 65: : 50:between 2061:2524085 2035:2284826 2000:1501936 1992:1989904 1932:0344463 1879:Bibcode 1850:2268390 1788:0357782 1744:0463433 1701:0200442 1685:2241787 1346:. When 1176:, then 483:are in 148:, then 2052:  2026:  2006:  1998:  1990:  1982:  1947:  1938:  1930:  1920:  1899:  1856:  1848:  1818:  1794:  1786:  1776:  1742:  1707:  1691:  1683:  1673:  1650:  1642:  1634:  1385:′′ is 681:, has 526:under 137:. If 1988:JSTOR 1832:(PDF) 1530:from 1369:′ is 1286:is a 52:plane 2050:ISBN 2024:ISBN 1945:ISBN 1918:ISBN 1897:ISSN 1774:ISBN 1671:ISBN 1632:ISSN 1511:< 1381:′ → 1208:and 499:of ( 288:< 125:and 34:, a 2042:doi 2016:doi 2004:Zbl 1980:JFM 1970:doi 1936:Zbl 1887:doi 1875:469 1854:Zbl 1816:JFM 1792:Zbl 1730:doi 1705:Zbl 1689:Zbl 1648:Zbl 1640:JFM 1622:doi 1483:is 1434:. 1397:is 1298:max 1231:If 1222:iKy 1188:If 1168:is 1164:If 1157:is 1010:sup 984:of 867:of 272:sup 85:is 2092:: 2077:, 2071:, 2058:MR 2056:, 2048:, 2032:MR 2030:, 2022:, 2002:, 1996:MR 1994:, 1986:, 1978:, 1966:43 1964:, 1951:). 1934:, 1928:MR 1926:, 1895:, 1885:, 1873:, 1869:, 1852:, 1846:MR 1842:53 1840:, 1834:, 1812:80 1790:, 1784:MR 1782:, 1768:: 1764:/ 1740:MR 1738:, 1726:83 1724:, 1711:). 1703:, 1698:MR 1687:, 1681:MR 1679:, 1669:, 1646:, 1638:, 1630:, 1618:65 1479:→ 1399:KK 1365:→ 1228:. 1220:+ 1216:↦ 1214:iy 1212:+ 1206:iy 1204:+ 1202:Kx 1200:↦ 1198:iy 1196:+ 1118:. 485:L( 101:. 58:. 2082:. 2063:. 2044:: 2037:. 2018:: 2011:. 1972:: 1904:. 1889:: 1881:: 1861:. 1823:. 1799:. 1755:n 1747:. 1732:: 1655:. 1624:: 1554:f 1545:1 1540:D 1538:( 1536:W 1532:D 1528:f 1514:1 1481:C 1477:D 1473:C 1469:C 1465:D 1441:) 1437:( 1407:K 1403:K 1395:f 1391:g 1387:K 1383:D 1379:D 1375:g 1371:K 1367:D 1363:D 1359:f 1352:s 1348:s 1334:) 1328:s 1325:+ 1322:1 1318:1 1313:, 1310:s 1307:+ 1304:1 1301:( 1284:z 1268:s 1263:| 1258:z 1254:| 1249:z 1243:z 1233:s 1226:K 1218:x 1210:x 1194:x 1190:K 1178:f 1174:K 1170:K 1166:f 1159:K 1155:f 1151:Γ 1147:f 1143:K 1139:Γ 1135:D 1131:Γ 1127:K 1116:f 1077:1 1056:+ 1053:1 1047:= 1043:| 1039:) 1036:z 1033:( 1030:K 1026:| 1020:D 1014:z 1006:= 1003:K 990:z 988:( 986:K 965:. 958:| 954:) 951:z 948:( 941:| 934:1 928:| 924:) 921:z 918:( 911:| 907:+ 904:1 898:= 895:) 892:z 889:( 886:K 873:z 869:f 858:f 839:. 833:2 828:| 822:z 814:f 805:| 796:2 792:) 787:| 779:| 772:1 769:( 765:, 759:2 754:| 748:z 740:f 731:| 722:2 718:) 713:| 705:| 701:+ 698:1 695:( 663:z 657:d 654:z 651:d 626:2 621:| 611:z 605:d 601:) 598:z 595:( 589:+ 586:z 583:d 578:| 571:2 566:| 560:z 552:f 543:| 528:f 516:1 511:D 509:( 507:W 502:1 493:f 489:) 487:D 477:D 475:( 473:W 466:f 462:f 454:f 450:D 446:D 441:1 436:f 432:z 415:, 410:2 405:| 395:z 389:d 385:) 382:z 379:( 373:+ 370:z 367:d 362:| 355:2 351:) 347:z 344:( 338:= 333:2 329:s 325:d 309:D 303:( 291:1 284:| 276:| 253:) 251:1 249:( 232:, 226:z 218:f 209:) 206:z 203:( 197:= 185:z 174:f 150:f 139:f 135:f 131:C 127:D 123:D 119:D 115:D 111:f 99:K 95:f 91:K 83:f 71:D 67:D 63:f 20:)

Index

Quasiconformal
complex analysis
Grötzsch (1928)
Ahlfors (1935)
homeomorphism
plane
eccentricity
orientation
open sets
continuously differentiable
continuous
partial derivatives
Beltrami equation
Lebesgue measurable
Bers 1977
metric tensor
1
Sobolev space
distributional derivatives
L(D)
weak solution
1
1
pullback
eigenvalues
supremum
extremal length
complex number

adding to it

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