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One-form (differential geometry)

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773: 551: 248: 768:{\displaystyle {\begin{aligned}d\theta &=\partial _{x}\left(\operatorname {atan2} (y,x)\right)dx+\partial _{y}\left(\operatorname {atan2} (y,x)\right)dy\\&=-{\frac {y}{x^{2}+y^{2}}}dx+{\frac {x}{x^{2}+y^{2}}}dy\end{aligned}}} 434: 143: 795:-axis – which reflects the fact that angle cannot be continuously defined, this derivative is continuously defined except at the origin, reflecting the fact that infinitesimal (and indeed local) 556: 1145: 799:
in angle can be defined everywhere except the origin. Integrating this derivative along a path gives the total change in angle over the path, and integrating over a closed loop gives the
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to the real numbers. In this case, each tangent space is naturally identifiable with the real number line, and the linear map
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of the punctured plane. This is the most basic example of such a form, and it is fundamental in differential geometry.
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While the angle "function" cannot be continuously defined – the function atan2 is discontinuous along the negative
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is not a globally defined smooth function on the entire punctured plane. In fact, this form generates the first
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transformation law on passing from one coordinate system to another. Thus a one-form is an order 1 covariant
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whose restriction to each fibre is a linear functional on the tangent space. Symbolically,
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The most basic non-trivial differential one-form is the "change in angle" form
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First Steps in Differential Geometry: Riemannian, Contact, Symplectic
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function. Taking the derivative yields the following formula for the
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Differential form of degree one or section of a cotangent bundle
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are smooth functions. From this perspective, a one-form has a
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This is the simplest example of a differential (one-)form.
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This is defined as the derivative of the angle "function"
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Pages displaying short descriptions of redirect targets
1203: – Expression that may be integrated over a region 1153: 1123: 1086: 1053: 1030: 1002: 962: 927: 895: 857: 809: 781: 554: 511: 485: 442: 298: 256: 146: 122: 102: 74: 1224: – Algebraic object with geometric applications 30:"One-form" redirects here. Not to be confused with 1183: 1139: 1109: 1072: 1039: 1016: 985: 945: 909: 863: 821: 787: 767: 532: 497: 455: 428: 269: 242: 130: 108: 80: 2824: 1961: 1305: 878: 1140:{\displaystyle \mathbb {R} \to \mathbb {R} } 1968: 1954: 1312: 1298: 1265: 1133: 1125: 976: 903: 409: 367: 331: 232: 164: 124: 68:. Equivalently, a one-form on a manifold 1975: 1669:Covariance and contravariance of vectors 910:{\displaystyle U\subseteq \mathbb {R} } 835:, this derivative is a one-form on the 14: 2825: 1949: 1293: 1080:a linear map from the tangent space 986:{\displaystyle f:U\to \mathbb {R} ,} 1147:in question is given by scaling by 24: 1532:Tensors in curvilinear coordinates 623: 573: 25: 2849: 1266:McInerney, Andrew (2013-07-09). 172: 2008:Differentiable/Smooth manifold 1259: 1235: 1175: 1162: 1129: 972: 940: 928: 655: 643: 605: 593: 527: 515: 406: 400: 364: 358: 328: 322: 280:Often one-forms are described 227: 191: 159: 13: 1: 1585:Exterior covariant derivative 1517:Tensor (intrinsic definition) 1228: 1610:Raising and lowering indices 533:{\displaystyle \theta (x,y)} 131:{\displaystyle \mathbb {R} } 7: 2714:Classification of manifolds 1848:Gluon field strength tensor 1319: 1194: 474: 270:{\displaystyle \alpha _{x}} 88:is a smooth mapping of the 10: 2854: 1659:Cartan formalism (physics) 1479:Penrose graphical notation 1184:{\displaystyle f'(x_{0}).} 1110:{\displaystyle T_{x_{0}}U} 1073:{\displaystyle x_{0}\in U} 921:(for example, an interval 885:Differential of a function 882: 879:Differential of a function 57:of degree one, that is, a 29: 2790:over commutative algebras 2747: 2706: 2639: 2536: 2432: 2379: 2370: 2206: 2129: 2068: 1988: 1865: 1805: 1754: 1747: 1639: 1570: 1507: 1451: 1398: 1345: 1338: 1331:Glossary of tensor theory 1327: 498:{\displaystyle d\theta .} 32:One-form (linear algebra) 2506:Riemann curvature tensor 1915:Gregorio Ricci-Curbastro 1787:Riemann curvature tensor 1494:Van der Waerden notation 1885:Elwin Bruno Christoffel 1818:Angular momentum tensor 1489:Tetrad (index notation) 1459:Abstract index notation 955:differentiable function 864:{\displaystyle \theta } 51:differentiable manifold 2298:Manifold with boundary 2013:Differential structure 1699:Levi-Civita connection 1185: 1141: 1111: 1074: 1047:assigns to each point 1041: 1018: 987: 947: 911: 865: 823: 822:{\displaystyle 2\pi .} 789: 769: 534: 499: 457: 430: 271: 244: 132: 110: 82: 1925:Jan Arnoldus Schouten 1880:Augustin-Louis Cauchy 1360:Differential geometry 1186: 1142: 1112: 1075: 1042: 1019: 988: 948: 946:{\displaystyle (a,b)} 912: 866: 833:differential geometry 824: 790: 770: 535: 500: 458: 456:{\displaystyle f_{i}} 431: 272: 245: 133: 111: 83: 39:differential geometry 2445:Covariant derivative 1996:Topological manifold 1900:Carl Friedrich Gauss 1833:stress–energy tensor 1828:Cauchy stress tensor 1580:Covariant derivative 1542:Antisymmetric tensor 1474:Multi-index notation 1151: 1121: 1084: 1051: 1028: 1000: 960: 925: 893: 855: 807: 779: 552: 509: 483: 440: 296: 292:of the coordinates: 254: 144: 120: 100: 72: 2479:Exterior derivative 2081:Atiyah–Singer index 2030:Riemannian manifold 1777:Nonmetricity tensor 1632:(2nd-order tensors) 1600:Hodge star operator 1590:Exterior derivative 1439:Transport phenomena 1424:Continuum mechanics 1380:Multilinear algebra 1247:www.damtp.cam.ac.uk 1017:{\displaystyle f'.} 845:exterior derivative 831:In the language of 2833:Differential forms 2785:Secondary calculus 2739:Singularity theory 2694:Parallel transport 2462:De Rham cohomology 2101:Generalized Stokes 1910:Tullio Levi-Civita 1853:Metric tensor (GR) 1767:Levi-Civita symbol 1620:Tensor contraction 1434:General relativity 1370:Euclidean geometry 1216:Reciprocal lattice 1181: 1137: 1107: 1070: 1040:{\displaystyle df} 1037: 1014: 983: 953:), and consider a 943: 907: 873:de Rham cohomology 861: 819: 785: 765: 763: 530: 495: 453: 426: 284:, particularly in 267: 240: 128: 106: 78: 2820: 2819: 2702: 2701: 2467:Differential form 2121:Whitney embedding 2055:Differential form 1943: 1942: 1905:Hermann Grassmann 1861: 1860: 1813:Moment of inertia 1674:Differential form 1649:Affine connection 1464:Einstein notation 1447: 1446: 1375:Exterior calculus 1355:Coordinate system 1279:978-1-4614-7732-7 1201:Differential form 1024:The differential 847:is zero) but not 788:{\displaystyle y} 753: 712: 286:local coordinates 109:{\displaystyle M} 81:{\displaystyle M} 55:differential form 16:(Redirected from 2845: 2812:Stratified space 2770:Fréchet manifold 2484:Interior product 2377: 2376: 2074: 1970: 1963: 1956: 1947: 1946: 1920:Bernhard Riemann 1752: 1751: 1595:Exterior product 1562:Two-point tensor 1547:Symmetric tensor 1429:Electromagnetism 1343: 1342: 1314: 1307: 1300: 1291: 1290: 1284: 1283: 1263: 1257: 1256: 1254: 1253: 1239: 1212: 1190: 1188: 1187: 1182: 1174: 1173: 1161: 1146: 1144: 1143: 1138: 1136: 1128: 1116: 1114: 1113: 1108: 1103: 1102: 1101: 1100: 1079: 1077: 1076: 1071: 1063: 1062: 1046: 1044: 1043: 1038: 1023: 1021: 1020: 1015: 1010: 992: 990: 989: 984: 979: 952: 950: 949: 944: 916: 914: 913: 908: 906: 870: 868: 867: 862: 828: 826: 825: 820: 794: 792: 791: 786: 774: 772: 771: 766: 764: 754: 752: 751: 750: 738: 737: 724: 713: 711: 710: 709: 697: 696: 683: 672: 662: 658: 631: 630: 612: 608: 581: 580: 546:total derivative 539: 537: 536: 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1989:Basic concepts 1986: 1985: 1973: 1972: 1965: 1958: 1950: 1941: 1940: 1938: 1937: 1932: 1930:Woldemar Voigt 1927: 1922: 1917: 1912: 1907: 1902: 1897: 1895:Leonhard Euler 1892: 1887: 1882: 1877: 1871: 1869: 1867:Mathematicians 1863: 1862: 1859: 1858: 1856: 1855: 1850: 1845: 1840: 1835: 1830: 1825: 1820: 1815: 1809: 1807: 1803: 1802: 1800: 1799: 1794: 1792:Torsion tensor 1789: 1784: 1779: 1774: 1769: 1764: 1758: 1756: 1749: 1745: 1744: 1742: 1741: 1736: 1731: 1726: 1721: 1716: 1711: 1706: 1701: 1696: 1691: 1686: 1681: 1676: 1671: 1666: 1661: 1656: 1651: 1645: 1643: 1637: 1636: 1634: 1633: 1627: 1625:Tensor product 1622: 1617: 1615:Symmetrization 1612: 1607: 1605:Lie derivative 1602: 1597: 1592: 1587: 1582: 1576: 1574: 1568: 1567: 1565: 1564: 1559: 1554: 1549: 1544: 1539: 1534: 1529: 1527:Tensor density 1524: 1519: 1513: 1511: 1505: 1504: 1502: 1501: 1499:Voigt notation 1496: 1491: 1486: 1484:Ricci calculus 1481: 1476: 1471: 1469:Index notation 1466: 1461: 1455: 1453: 1449: 1448: 1445: 1444: 1442: 1441: 1436: 1431: 1426: 1421: 1415: 1413: 1411: 1410: 1405: 1399: 1396: 1395: 1393: 1392: 1387: 1385:Tensor algebra 1382: 1377: 1372: 1367: 1365:Dyadic algebra 1362: 1357: 1351: 1349: 1340: 1336: 1335: 1328: 1325: 1324: 1317: 1316: 1309: 1302: 1294: 1286: 1285: 1278: 1258: 1233: 1232: 1230: 1227: 1226: 1225: 1219: 1213: 1204: 1196: 1193: 1180: 1177: 1172: 1168: 1164: 1160: 1157: 1135: 1131: 1127: 1106: 1099: 1095: 1090: 1069: 1066: 1061: 1057: 1036: 1033: 1013: 1009: 1006: 982: 978: 974: 971: 968: 965: 942: 939: 936: 933: 930: 905: 901: 898: 883:Main article: 880: 877: 860: 818: 815: 812: 801:winding number 798: 784: 760: 757: 749: 745: 741: 736: 732: 727: 722: 719: 716: 708: 704: 700: 695: 691: 686: 681: 678: 675: 673: 671: 668: 665: 661: 657: 654: 651: 648: 645: 642: 639: 635: 629: 625: 621: 618: 615: 611: 607: 604: 601: 598: 595: 592: 589: 585: 579: 575: 571: 568: 566: 564: 561: 558: 557: 529: 526: 523: 520: 517: 514: 494: 491: 488: 476: 473: 450: 446: 425: 420: 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2544: 2543: 2541: 2539: 2535: 2529: 2528:Wedge product 2526: 2524: 2521: 2517: 2514: 2513: 2512: 2509: 2507: 2504: 2500: 2497: 2496: 2495: 2492: 2490: 2487: 2485: 2482: 2480: 2477: 2473: 2472:Vector-valued 2470: 2469: 2468: 2465: 2463: 2460: 2456: 2453: 2452: 2451: 2448: 2446: 2443: 2441: 2438: 2437: 2435: 2431: 2425: 2422: 2420: 2417: 2415: 2412: 2408: 2405: 2404: 2403: 2402:Tangent space 2400: 2398: 2395: 2393: 2390: 2388: 2385: 2384: 2382: 2378: 2375: 2373: 2369: 2363: 2360: 2358: 2354: 2350: 2348: 2345: 2343: 2339: 2335: 2331: 2329: 2326: 2324: 2321: 2319: 2316: 2314: 2311: 2309: 2306: 2304: 2301: 2299: 2296: 2292: 2289: 2288: 2287: 2284: 2282: 2279: 2277: 2274: 2272: 2269: 2267: 2264: 2262: 2259: 2257: 2254: 2252: 2249: 2247: 2244: 2242: 2239: 2237: 2233: 2229: 2227: 2223: 2219: 2217: 2214: 2213: 2211: 2205: 2199: 2196: 2194: 2191: 2189: 2186: 2184: 2181: 2179: 2176: 2174: 2171: 2167: 2166:in Lie theory 2164: 2163: 2162: 2159: 2157: 2154: 2150: 2147: 2146: 2145: 2142: 2140: 2137: 2136: 2134: 2132: 2128: 2122: 2119: 2117: 2114: 2112: 2109: 2107: 2104: 2102: 2099: 2097: 2094: 2092: 2089: 2087: 2084: 2082: 2079: 2078: 2076: 2073: 2069:Main results 2067: 2061: 2058: 2056: 2053: 2051: 2050:Tangent space 2048: 2046: 2043: 2041: 2038: 2036: 2033: 2031: 2028: 2026: 2023: 2019: 2016: 2014: 2011: 2010: 2009: 2006: 2002: 1999: 1998: 1997: 1994: 1993: 1991: 1987: 1982: 1978: 1971: 1966: 1964: 1959: 1957: 1952: 1951: 1948: 1936: 1933: 1931: 1928: 1926: 1923: 1921: 1918: 1916: 1913: 1911: 1908: 1906: 1903: 1901: 1898: 1896: 1893: 1891: 1888: 1886: 1883: 1881: 1878: 1876: 1873: 1872: 1870: 1868: 1864: 1854: 1851: 1849: 1846: 1844: 1841: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1819: 1816: 1814: 1811: 1810: 1808: 1804: 1798: 1795: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1772:Metric tensor 1770: 1768: 1765: 1763: 1760: 1759: 1757: 1753: 1750: 1746: 1740: 1737: 1735: 1732: 1730: 1727: 1725: 1722: 1720: 1717: 1715: 1712: 1710: 1707: 1705: 1702: 1700: 1697: 1695: 1692: 1690: 1687: 1685: 1684:Exterior form 1682: 1680: 1677: 1675: 1672: 1670: 1667: 1665: 1662: 1660: 1657: 1655: 1652: 1650: 1647: 1646: 1644: 1638: 1631: 1628: 1626: 1623: 1621: 1618: 1616: 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1591: 1588: 1586: 1583: 1581: 1578: 1577: 1575: 1573: 1569: 1563: 1560: 1558: 1557:Tensor bundle 1555: 1553: 1550: 1548: 1545: 1543: 1540: 1538: 1535: 1533: 1530: 1528: 1525: 1523: 1520: 1518: 1515: 1514: 1512: 1506: 1500: 1497: 1495: 1492: 1490: 1487: 1485: 1482: 1480: 1477: 1475: 1472: 1470: 1467: 1465: 1462: 1460: 1457: 1456: 1454: 1450: 1440: 1437: 1435: 1432: 1430: 1427: 1425: 1422: 1420: 1417: 1416: 1414: 1409: 1406: 1404: 1401: 1400: 1397: 1391: 1388: 1386: 1383: 1381: 1378: 1376: 1373: 1371: 1368: 1366: 1363: 1361: 1358: 1356: 1353: 1352: 1350: 1348: 1344: 1341: 1337: 1333: 1332: 1326: 1322: 1315: 1310: 1308: 1303: 1301: 1296: 1295: 1292: 1281: 1275: 1271: 1270: 1262: 1248: 1244: 1238: 1234: 1223: 1220: 1217: 1214: 1208: 1207:Inner product 1205: 1202: 1199: 1198: 1192: 1178: 1170: 1166: 1158: 1155: 1104: 1097: 1093: 1088: 1067: 1064: 1059: 1055: 1034: 1031: 1011: 1007: 1004: 996: 980: 969: 966: 963: 956: 937: 934: 931: 920: 899: 896: 886: 876: 874: 858: 850: 846: 842: 838: 834: 829: 816: 813: 810: 802: 796: 782: 758: 755: 747: 743: 739: 734: 730: 725: 720: 717: 714: 706: 702: 698: 693: 689: 684: 679: 676: 674: 666: 663: 659: 652: 649: 646: 640: 637: 633: 627: 619: 616: 613: 609: 602: 599: 596: 590: 587: 583: 577: 569: 567: 562: 559: 547: 543: 524: 521: 518: 512: 492: 489: 486: 472: 470: 466: 448: 444: 423: 418: 414: 410: 403: 395: 391: 387: 384: 381: 376: 372: 368: 361: 353: 349: 345: 340: 336: 332: 325: 317: 313: 309: 304: 300: 291: 290:differentials 287: 283: 278: 262: 258: 237: 224: 219: 215: 211: 206: 201: 197: 186: 183: 178: 174: 169: 156: 153: 150: 147: 139: 103: 95: 91: 75: 67: 63: 60: 56: 52: 48: 44: 40: 33: 19: 2734:Moving frame 2729:Morse theory 2719:Gauge theory 2511:Tensor field 2440:Closed/Exact 2419:Vector field 2387:Distribution 2328:Hypercomplex 2323:Quaternionic 2060:Vector field 2018:Smooth atlas 1935:Hermann Weyl 1739:Vector space 1724:Pseudotensor 1689:Fiber bundle 1642:abstractions 1537:Mixed tensor 1522:Tensor field 1329: 1268: 1261: 1250:. Retrieved 1246: 1237: 888: 830: 478: 469:tensor field 279: 140: 46: 42: 36: 2679:Levi-Civita 2669:Generalized 2641:Connections 2591:Lie algebra 2523:Volume form 2424:Vector flow 2397:Pushforward 2392:Lie bracket 2291:Lie algebra 2256:G-structure 2045:Pushforward 2025:Submanifold 1875:Élie Cartan 1823:Spin tensor 1797:Weyl tensor 1755:Mathematics 1719:Multivector 1510:definitions 1408:Engineering 1347:Mathematics 277:is linear. 90:total space 2838:1 (number) 2827:Categories 2802:Stratifold 2760:Diffeology 2556:Associated 2357:Symplectic 2342:Riemannian 2271:Hyperbolic 2198:Submersion 2106:Hopf–Rinow 2040:Submersion 2035:Smooth map 1704:Linear map 1572:Operations 1252:2022-10-04 1229:References 995:derivative 436:where the 2684:Principal 2659:Ehresmann 2616:Subbundle 2606:Principal 2581:Fibration 2561:Cotangent 2433:Covectors 2286:Lie group 2266:Hermitian 2209:manifolds 2178:Immersion 2173:Foliation 2111:Noether's 2096:Frobenius 2091:De Rham's 2086:Darboux's 1977:Manifolds 1843:EM tensor 1679:Dimension 1630:Transpose 1130:→ 1065:∈ 973:→ 900:⊆ 859:θ 814:π 680:− 641:⁡ 624:∂ 591:⁡ 574:∂ 563:θ 513:θ 490:θ 465:covariant 385:⋯ 301:α 259:α 228:→ 187:α 175:α 160:→ 148:α 2780:Orbifold 2775:K-theory 2765:Diffiety 2489:Pullback 2303:Oriented 2281:Kenmotsu 2261:Hadamard 2207:Types of 2156:Geodesic 1981:Glossary 1709:Manifold 1694:Geodesic 1452:Notation 1195:See also 1159:′ 1008:′ 839:. It is 475:Examples 43:one-form 18:One-form 2724:History 2707:Related 2621:Tangent 2599:)  2579:)  2546:Adjoint 2538:Bundles 2516:density 2414:Torsion 2380:Vectors 2372:Tensors 2355:)  2340:)  2336:,  2334:Pseudo− 2313:Poisson 2246:Finsler 2241:Fibered 2236:Contact 2234:)  2226:Complex 2224:)  2193:Section 1806:Physics 1640:Related 1403:Physics 1321:Tensors 797:changes 282:locally 92:of the 64:of the 62:section 49:) on a 2689:Vector 2674:Koszul 2654:Cartan 2649:Affine 2631:Vector 2626:Tensor 2611:Spinor 2601:Normal 2597:Stable 2551:Affine 2455:bundle 2407:bundle 2353:Almost 2276:Kähler 2232:Almost 2222:Almost 2216:Closed 2116:Sard's 2072:(list) 1734:Vector 1729:Spinor 1714:Matrix 1508:Tensor 1276:  1222:Tensor 841:closed 803:times 250:where 59:smooth 2797:Sheaf 2571:Fiber 2347:Rizza 2318:Prime 2149:Local 2139:Curve 2001:Atlas 1654:Basis 1339:Scope 993:with 849:exact 843:(its 638:atan2 588:atan2 542:atan2 53:is a 2664:Form 2566:Dual 2499:flow 2362:Tame 2338:Sub− 2251:Flat 2131:Maps 1274:ISBN 919:open 889:Let 45:(or 41:, a 2586:Jet 917:be 116:to 96:of 37:In 2829:: 2577:Co 1245:. 548:: 471:. 2595:( 2575:( 2351:( 2332:( 2230:( 2220:( 1983:) 1979:( 1969:e 1962:t 1955:v 1313:e 1306:t 1299:v 1282:. 1255:. 1179:. 1176:) 1171:0 1167:x 1163:( 1156:f 1134:R 1126:R 1105:U 1098:0 1094:x 1089:T 1068:U 1060:0 1056:x 1035:f 1032:d 1012:. 1005:f 981:, 977:R 970:U 967:: 964:f 941:) 938:b 935:, 932:a 929:( 904:R 897:U 817:. 811:2 783:y 759:y 756:d 748:2 744:y 740:+ 735:2 731:x 726:x 721:+ 718:x 715:d 707:2 703:y 699:+ 694:2 690:x 685:y 677:= 667:y 664:d 660:) 656:) 653:x 650:, 647:y 644:( 634:( 628:y 620:+ 617:x 614:d 610:) 606:) 603:x 600:, 597:y 594:( 584:( 578:x 570:= 560:d 528:) 525:y 522:, 519:x 516:( 493:. 487:d 449:i 445:f 424:, 419:n 415:x 411:d 407:) 404:x 401:( 396:n 392:f 388:+ 382:+ 377:2 373:x 369:d 365:) 362:x 359:( 354:2 350:f 346:+ 341:1 337:x 333:d 329:) 326:x 323:( 318:1 314:f 310:= 305:x 263:x 238:, 233:R 225:M 220:x 216:T 212:: 207:M 202:x 198:T 192:| 184:= 179:x 170:, 165:R 157:M 154:T 151:: 125:R 104:M 76:M 34:. 20:)

Index

One-form
One-form (linear algebra)
differential geometry
differentiable manifold
differential form
smooth
section
cotangent bundle
total space
tangent bundle
locally
local coordinates
differentials
covariant
tensor field
atan2
total derivative
winding number
differential geometry
punctured plane
closed
exterior derivative
exact
de Rham cohomology
Differential of a function
open
differentiable function
derivative
Differential form
Inner product

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