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Antisymmetric tensor

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Similar definitions can be given for other pairs of indices. As the term "part" suggests, a tensor is the sum of its symmetric part and antisymmetric part for a given pair of indices, as in
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A shorthand notation for anti-symmetrization is denoted by a pair of square brackets. For example, in arbitrary dimensions, for an order 2 covariant tensor
1312:{\displaystyle {\begin{aligned}M_{}&={\frac {1}{2!}}\,\delta _{ab}^{cd}M_{cd},\\T_{}&={\frac {1}{3!}}\,\delta _{abc}^{def}T_{def}.\end{aligned}}} 2313: 516: 742: 1892: 1857: 1830: 627: 848: 2497: 2176: 1956: 1913: 2378: 1698:
Trivially, all scalars and vectors (tensors of order 0 and 1) are totally antisymmetric (as well as being totally symmetric).
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This decomposition is not in general true for tensors of rank 3 or more, which have more complex symmetries.
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In general, every tensor of rank 2 can be decomposed into a symmetric and anti-symmetric pair as:
2554: 2411: 2264: 2078: 2014: 1904: 1775: 370: 55: 1796: – process that converts any function in n variables to a symmetric function in n variables 17: 2549: 2457: 2318: 2293: 2108: 2019: 1999: 1909: 1888: 1853: 1847: 1826: 271: 2600: 2564: 2462: 2239: 2206: 2191: 2073: 1942: 1787: 1769: 1736: 2534: 2482: 2426: 2406: 2308: 2196: 2063: 2034: 1929: 483: 2574: 2539: 2519: 2436: 2269: 2259: 2249: 2171: 2143: 2128: 2113: 2029: 1793: 1781: 1377: 463: 400: 380: 352: 332: 298: 275: 253: 1111:{\displaystyle T_{}={\frac {1}{3!}}(T_{abc}-T_{acb}+T_{bca}-T_{bac}+T_{cab}-T_{cba}).} 2594: 2511: 2416: 2328: 2201: 1878: 1819: 294:, and a completely antisymmetric contravariant tensor field may be referred to as a 2579: 2383: 2368: 2333: 2181: 2166: 1677:{\displaystyle T_{ij}={\frac {1}{2}}(T_{ij}+T_{ji})+{\frac {1}{2}}(T_{ij}-T_{ji}).} 248: 244: 1374:
More generally, irrespective of the number of dimensions, antisymmetrization over
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holds when the tensor is antisymmetric with respect to its first three indices.
31: 2348: 2323: 2274: 608:{\displaystyle U_{(ij)k\dots }={\frac {1}{2}}(U_{ijk\dots }+U_{jik\dots })} 2353: 2338: 2047: 2009: 719:{\displaystyle U_{k\dots }={\frac {1}{2}}(U_{ijk\dots }-U_{jik\dots })} 2373: 1965: 39: 1790: – Tensor invariant under permutations of vectors it acts on 1938: 1784: – Tensor index notation for tensor-based calculations 1934: 1778: – Antisymmetric permutation object acting on tensors 827:{\displaystyle U_{ijk\dots }=U_{(ij)k\dots }+U_{k\dots }.} 27:
Tensor equal to the negative of any of its transpositions
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930:{\displaystyle M_{}={\frac {1}{2!}}(M_{ab}-M_{ba}),} 2510: 2450: 2399: 2392: 2284: 2215: 2152: 2096: 2043: 1990: 1983: 1120:In any 2 and 3 dimensions, these can be written as 1818: 1727: 1676: 1545: 1386: 1355: 1311: 1110: 929: 826: 718: 607: 506:has symmetric and antisymmetric parts defined as: 495: 472: 452: 409: 389: 361: 341: 307: 284: 262: 216: 1846:Juan Ramón Ruíz-Tolosa; Enrique Castillo (2005). 1821:Mathematical methods for physics and engineering 1908:. W.H. Freeman & Co. pp. 85–86, §3.5. 1950: 1902:J.A. Wheeler; C. Misner; K.S. Thorne (1973). 1356:{\displaystyle \delta _{ab\dots }^{cd\dots }} 8: 1930:Antisymmetric Tensor – mathworld.wolfram.com 1817:K.F. Riley; M.P. Hobson; S.J. Bence (2010). 1772: – Algebra of exterior/ wedge products 227:If a tensor changes sign under exchange of 2396: 1987: 1957: 1943: 1935: 1716: 1710: 1659: 1643: 1626: 1611: 1595: 1578: 1566: 1560: 1532: 1519: 1514: 1502: 1489: 1484: 1477: 1464: 1459: 1440: 1426: 1413: 1405: 1399: 1379: 1341: 1330: 1324: 1290: 1274: 1263: 1258: 1243: 1218: 1198: 1185: 1177: 1172: 1157: 1135: 1127: 1125: 1090: 1071: 1052: 1033: 1014: 995: 973: 952: 946: 912: 896: 874: 856: 850: 800: 772: 750: 744: 698: 676: 659: 635: 629: 587: 565: 548: 524: 518: 485: 465: 435: 429: 402: 382: 354: 334: 300: 277: 255: 199: 174: 152: 127: 105: 80: 74: 2314:Covariance and contravariance of vectors 243:. A completely antisymmetric covariant 231:pair of its indices, then the tensor is 1809: 1694:Totally antisymmetric tensors include: 7: 937:and for an order 3 covariant tensor 321:Antisymmetric and symmetric tensors 2177:Tensors in curvilinear coordinates 25: 329:that is antisymmetric on indices 18:Completely antisymmetric tensor 1825:. Cambridge University Press. 1668: 1636: 1620: 1588: 1432: 1406: 1231: 1219: 1145: 1136: 1102: 988: 965: 953: 921: 889: 866: 857: 810: 801: 782: 773: 713: 669: 645: 636: 602: 558: 534: 525: 1: 2230:Exterior covariant derivative 2162:Tensor (intrinsic definition) 1369:Einstein summation convention 453:{\displaystyle U_{ijk\dots }} 377:that is symmetric on indices 2255:Raising and lowering indices 1728:{\displaystyle F_{\mu \nu }} 1394:indices may be expressed as 2493:Gluon field strength tensor 1365:generalized Kronecker delta 2617: 2304:Cartan formalism (physics) 2124:Penrose graphical notation 1748:pseudo-Riemannian manifold 369:has the property that the 1976:Glossary of tensor theory 1972: 1852:. Springer. p. 225. 2560:Gregorio Ricci-Curbastro 2432:Riemann curvature tensor 2139:Van der Waerden notation 1763: – Form of a matrix 270:may be referred to as a 2530:Elwin Bruno Christoffel 2463:Angular momentum tensor 2134:Tetrad (index notation) 2104:Abstract index notation 1849:From Vectors to Tensors 2344:Levi-Civita connection 1744:Riemannian volume form 1729: 1703:electromagnetic tensor 1678: 1547: 1388: 1357: 1313: 1112: 931: 828: 731:(antisymmetric part). 720: 609: 497: 474: 460:and a pair of indices 454: 411: 391: 363: 343: 309: 286: 264: 218: 2570:Jan Arnoldus Schouten 2525:Augustin-Louis Cauchy 2005:Differential geometry 1730: 1679: 1548: 1389: 1358: 1314: 1113: 932: 829: 721: 610: 498: 475: 455: 420:For a general tensor 412: 392: 364: 344: 310: 287: 265: 219: 2545:Carl Friedrich Gauss 2478:stress–energy tensor 2473:Cauchy stress tensor 2225:Covariant derivative 2187:Antisymmetric tensor 2119:Multi-index notation 1761:Antisymmetric matrix 1709: 1559: 1398: 1378: 1323: 1124: 945: 849: 743: 628: 517: 484: 464: 428: 401: 381: 353: 333: 299: 276: 254: 73: 2422:Nonmetricity tensor 2277:(2nd-order tensors) 2245:Hodge star operator 2235:Exterior derivative 2084:Transport phenomena 2069:Continuum mechanics 2025:Multilinear algebra 1884:The Road to Reality 1509: 1352: 1285: 1193: 36:theoretical physics 2555:Tullio Levi-Civita 2498:Metric tensor (GR) 2412:Levi-Civita symbol 2265:Tensor contraction 2079:General relativity 2015:Euclidean geometry 1776:Levi-Civita symbol 1725: 1674: 1543: 1455: 1384: 1353: 1326: 1309: 1307: 1259: 1173: 1108: 927: 824: 716: 605: 496:{\displaystyle j,} 493: 470: 450: 417:is identically 0. 407: 387: 359: 339: 305: 282: 260: 214: 2588: 2587: 2550:Hermann Grassmann 2506: 2505: 2458:Moment of inertia 2319:Differential form 2294:Affine connection 2109:Einstein notation 2092: 2091: 2020:Exterior calculus 2000:Coordinate system 1894:978-0-679-77631-4 1887:. Vintage books. 1859:978-3-540-22887-5 1832:978-0-521-86153-3 1634: 1586: 1453: 1387:{\displaystyle p} 1256: 1170: 986: 887: 735: 734: 667: 620:(symmetric part) 556: 473:{\displaystyle i} 410:{\displaystyle j} 390:{\displaystyle i} 362:{\displaystyle j} 342:{\displaystyle i} 308:{\displaystyle k} 285:{\displaystyle k} 263:{\displaystyle k} 54:if it alternates 16:(Redirected from 2608: 2565:Bernhard Riemann 2397: 2240:Exterior product 2207:Two-point tensor 2192:Symmetric tensor 2074:Electromagnetism 1988: 1959: 1952: 1945: 1936: 1919: 1898: 1865: 1863: 1843: 1837: 1836: 1824: 1814: 1799: 1788:Symmetric tensor 1770:Exterior algebra 1766: 1737:electromagnetism 1734: 1732: 1731: 1726: 1724: 1723: 1683: 1681: 1680: 1675: 1667: 1666: 1651: 1650: 1635: 1627: 1619: 1618: 1603: 1602: 1587: 1579: 1574: 1573: 1552: 1550: 1549: 1544: 1539: 1538: 1537: 1536: 1524: 1523: 1508: 1507: 1506: 1494: 1493: 1483: 1482: 1481: 1469: 1468: 1454: 1452: 1441: 1436: 1435: 1431: 1430: 1418: 1417: 1393: 1391: 1390: 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2593: 2592: 2586: 2585: 2583: 2582: 2577: 2575:Woldemar Voigt 2572: 2567: 2562: 2557: 2552: 2547: 2542: 2540:Leonhard Euler 2537: 2532: 2527: 2522: 2516: 2514: 2512:Mathematicians 2508: 2507: 2504: 2503: 2501: 2500: 2495: 2490: 2485: 2480: 2475: 2470: 2465: 2460: 2454: 2452: 2448: 2447: 2445: 2444: 2439: 2437:Torsion tensor 2434: 2429: 2424: 2419: 2414: 2409: 2403: 2401: 2394: 2390: 2389: 2387: 2386: 2381: 2376: 2371: 2366: 2361: 2356: 2351: 2346: 2341: 2336: 2331: 2326: 2321: 2316: 2311: 2306: 2301: 2296: 2290: 2288: 2282: 2281: 2279: 2278: 2272: 2270:Tensor product 2267: 2262: 2260:Symmetrization 2257: 2252: 2250:Lie derivative 2247: 2242: 2237: 2232: 2227: 2221: 2219: 2213: 2212: 2210: 2209: 2204: 2199: 2194: 2189: 2184: 2179: 2174: 2172:Tensor density 2169: 2164: 2158: 2156: 2150: 2149: 2147: 2146: 2144:Voigt notation 2141: 2136: 2131: 2129:Ricci calculus 2126: 2121: 2116: 2114:Index notation 2111: 2106: 2100: 2098: 2094: 2093: 2090: 2089: 2087: 2086: 2081: 2076: 2071: 2066: 2060: 2058: 2056: 2055: 2050: 2044: 2041: 2040: 2038: 2037: 2032: 2030:Tensor algebra 2027: 2022: 2017: 2012: 2010:Dyadic algebra 2007: 2002: 1996: 1994: 1985: 1981: 1980: 1973: 1970: 1969: 1964: 1962: 1961: 1954: 1947: 1939: 1933: 1932: 1925: 1924:External links 1922: 1921: 1920: 1914: 1899: 1893: 1879:Penrose, Roger 1873: 1870: 1867: 1866: 1858: 1838: 1831: 1808: 1807: 1805: 1802: 1801: 1800: 1794:Symmetrization 1791: 1785: 1782:Ricci calculus 1779: 1773: 1767: 1756: 1753: 1752: 1751: 1740: 1722: 1719: 1715: 1699: 1691: 1688: 1673: 1670: 1665: 1662: 1658: 1654: 1649: 1646: 1642: 1638: 1633: 1630: 1625: 1622: 1617: 1614: 1610: 1606: 1601: 1598: 1594: 1590: 1585: 1582: 1577: 1572: 1569: 1565: 1542: 1535: 1531: 1527: 1522: 1518: 1513: 1505: 1501: 1497: 1492: 1488: 1480: 1476: 1472: 1467: 1463: 1458: 1451: 1448: 1444: 1439: 1434: 1429: 1425: 1421: 1416: 1412: 1408: 1404: 1383: 1350: 1347: 1344: 1339: 1336: 1333: 1329: 1304: 1299: 1296: 1293: 1289: 1283: 1280: 1277: 1272: 1269: 1266: 1262: 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373:with a tensor 358: 338: 322: 319: 304: 281: 259: 211: 208: 205: 202: 198: 194: 191: 186: 183: 180: 177: 173: 169: 164: 161: 158: 155: 151: 147: 144: 139: 136: 133: 130: 126: 122: 117: 114: 111: 108: 104: 100: 97: 92: 89: 86: 83: 79: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2613: 2602: 2599: 2598: 2596: 2581: 2578: 2576: 2573: 2571: 2568: 2566: 2563: 2561: 2558: 2556: 2553: 2551: 2548: 2546: 2543: 2541: 2538: 2536: 2533: 2531: 2528: 2526: 2523: 2521: 2518: 2517: 2515: 2513: 2509: 2499: 2496: 2494: 2491: 2489: 2486: 2484: 2481: 2479: 2476: 2474: 2471: 2469: 2466: 2464: 2461: 2459: 2456: 2455: 2453: 2449: 2443: 2440: 2438: 2435: 2433: 2430: 2428: 2425: 2423: 2420: 2418: 2417:Metric tensor 2415: 2413: 2410: 2408: 2405: 2404: 2402: 2398: 2395: 2391: 2385: 2382: 2380: 2377: 2375: 2372: 2370: 2367: 2365: 2362: 2360: 2357: 2355: 2352: 2350: 2347: 2345: 2342: 2340: 2337: 2335: 2332: 2330: 2329:Exterior form 2327: 2325: 2322: 2320: 2317: 2315: 2312: 2310: 2307: 2305: 2302: 2300: 2297: 2295: 2292: 2291: 2289: 2283: 2276: 2273: 2271: 2268: 2266: 2263: 2261: 2258: 2256: 2253: 2251: 2248: 2246: 2243: 2241: 2238: 2236: 2233: 2231: 2228: 2226: 2223: 2222: 2220: 2218: 2214: 2208: 2205: 2203: 2202:Tensor bundle 2200: 2198: 2195: 2193: 2190: 2188: 2185: 2183: 2180: 2178: 2175: 2173: 2170: 2168: 2165: 2163: 2160: 2159: 2157: 2151: 2145: 2142: 2140: 2137: 2135: 2132: 2130: 2127: 2125: 2122: 2120: 2117: 2115: 2112: 2110: 2107: 2105: 2102: 2101: 2099: 2095: 2085: 2082: 2080: 2077: 2075: 2072: 2070: 2067: 2065: 2062: 2061: 2059: 2054: 2051: 2049: 2046: 2045: 2042: 2036: 2033: 2031: 2028: 2026: 2023: 2021: 2018: 2016: 2013: 2011: 2008: 2006: 2003: 2001: 1998: 1997: 1995: 1993: 1989: 1986: 1982: 1978: 1977: 1971: 1967: 1960: 1955: 1953: 1948: 1946: 1941: 1940: 1937: 1931: 1928: 1927: 1923: 1917: 1915:0-7167-0344-0 1911: 1907: 1906: 1900: 1896: 1890: 1886: 1885: 1880: 1876: 1875: 1871: 1861: 1855: 1851: 1850: 1842: 1839: 1834: 1828: 1823: 1822: 1813: 1810: 1803: 1795: 1792: 1789: 1786: 1783: 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909: 905: 900: 897: 893: 883: 880: 876: 871: 863: 860: 853: 844: 836: 834: 821: 816: 813: 807: 804: 797: 793: 788: 785: 779: 776: 769: 765: 760: 757: 754: 751: 747: 730: 727: 708: 705: 702: 699: 695: 691: 686: 683: 680: 677: 673: 664: 661: 656: 651: 648: 642: 639: 632: 624: 623: 619: 616: 597: 594: 591: 588: 584: 580: 575: 572: 569: 566: 562: 553: 550: 545: 540: 537: 531: 528: 521: 513: 512: 509: 508: 507: 505: 490: 487: 467: 445: 442: 439: 436: 432: 423: 418: 404: 384: 376: 372: 356: 336: 328: 320: 318: 316: 302: 293: 279: 272:differential 257: 250: 246: 242: 241:antisymmetric 238: 234: 230: 225: 209: 206: 203: 200: 196: 192: 189: 184: 181: 178: 175: 171: 167: 162: 159: 156: 153: 149: 145: 142: 137: 134: 131: 128: 124: 120: 115: 112: 109: 106: 102: 98: 95: 90: 87: 84: 81: 77: 69:For example, 67: 65: 64:contravariant 61: 57: 53: 49: 45: 41: 37: 33: 19: 2580:Hermann Weyl 2384:Vector space 2369:Pseudotensor 2334:Fiber bundle 2287:abstractions 2186: 2182:Mixed tensor 2167:Tensor field 1974: 1903: 1882: 1848: 1841: 1820: 1812: 1693: 1685: 1554: 1373: 1119: 938: 842: 840: 738: 503: 421: 419: 374: 326: 324: 245:tensor field 240: 236: 232: 228: 226: 68: 63: 59: 51: 47: 43: 29: 2520:Élie Cartan 2468:Spin tensor 2442:Weyl tensor 2400:Mathematics 2364:Multivector 2155:definitions 2053:Engineering 1992:Mathematics 1905:Gravitation 1864:section §7. 1371:is in use. 371:contraction 32:mathematics 2349:Linear map 2217:Operations 1872:References 1367:, and the 233:completely 2488:EM tensor 2324:Dimension 2275:Transpose 1721:ν 1718:μ 1653:− 1526:… 1496:… 1471:… 1457:δ 1420:… 1349:… 1338:… 1328:δ 1261:δ 1175:δ 1084:− 1046:− 1008:− 906:− 817:… 789:… 761:… 709:… 692:− 687:… 652:… 598:… 576:… 541:… 446:… 325:A tensor 210:… 193:− 185:… 163:… 146:− 138:… 116:… 99:− 91:… 60:covariant 2595:Category 2354:Manifold 2339:Geodesic 2097:Notation 1881:(2007). 1755:See also 1690:Examples 837:Notation 2601:Tensors 2451:Physics 2285:Related 2048:Physics 1966:Tensors 1363:is the 317:field. 315:-vector 237:totally 62:or all 2379:Vector 2374:Spinor 2359:Matrix 2153:Tensor 1912:  1891:  1856:  1829:  1319:where 728:  617:  40:tensor 2299:Basis 1984:Scope 1804:Notes 1746:on a 292:-form 249:order 1910:ISBN 1889:ISBN 1854:ISBN 1827:ISBN 1742:The 1701:The 480:and 397:and 349:and 235:(or 229:each 56:sign 46:(or 38:, a 34:and 1735:in 247:of 42:is 30:In 2597:: 1705:, 941:, 845:, 239:) 66:. 50:) 1958:e 1951:t 1944:v 1918:. 1897:. 1862:. 1835:. 1750:. 1739:. 1714:F 1672:. 1669:) 1664:i 1661:j 1657:T 1648:j 1645:i 1641:T 1637:( 1632:2 1629:1 1624:+ 1621:) 1616:i 1613:j 1609:T 1605:+ 1600:j 1597:i 1593:T 1589:( 1584:2 1581:1 1576:= 1571:j 1568:i 1564:T 1541:. 1534:p 1530:b 1521:1 1517:b 1512:T 1504:p 1500:b 1491:1 1487:b 1479:p 1475:a 1466:1 1462:a 1450:! 1447:p 1443:1 1438:= 1433:] 1428:p 1424:a 1415:1 1411:a 1407:[ 1403:T 1382:p 1346:d 1343:c 1335:b 1332:a 1303:. 1298:f 1295:e 1292:d 1288:T 1282:f 1279:e 1276:d 1271:c 1268:b 1265:a 1253:! 1250:3 1246:1 1241:= 1232:] 1229:c 1226:b 1223:a 1220:[ 1216:T 1208:, 1203:d 1200:c 1196:M 1190:d 1187:c 1182:b 1179:a 1167:! 1164:2 1160:1 1155:= 1146:] 1143:b 1140:a 1137:[ 1133:M 1106:. 1103:) 1098:a 1095:b 1092:c 1088:T 1079:b 1076:a 1073:c 1069:T 1065:+ 1060:c 1057:a 1054:b 1050:T 1041:a 1038:c 1035:b 1031:T 1027:+ 1022:b 1019:c 1016:a 1012:T 1003:c 1000:b 997:a 993:T 989:( 983:! 980:3 976:1 971:= 966:] 963:c 960:b 957:a 954:[ 950:T 939:T 925:, 922:) 917:a 914:b 910:M 901:b 898:a 894:M 890:( 884:! 881:2 877:1 872:= 867:] 864:b 861:a 858:[ 854:M 843:M 822:. 814:k 811:] 808:j 805:i 802:[ 798:U 794:+ 786:k 783:) 780:j 777:i 774:( 770:U 766:= 758:k 755:j 752:i 748:U 714:) 706:k 703:i 700:j 696:U 684:k 681:j 678:i 674:U 670:( 665:2 662:1 657:= 649:k 646:] 643:j 640:i 637:[ 633:U 603:) 595:k 592:i 589:j 585:U 581:+ 573:k 570:j 567:i 563:U 559:( 554:2 551:1 546:= 538:k 535:) 532:j 529:i 526:( 522:U 504:U 491:, 488:j 468:i 443:k 440:j 437:i 433:U 422:U 405:j 385:i 375:B 357:j 337:i 327:A 303:k 280:k 258:k 207:j 204:k 201:i 197:T 190:= 182:j 179:i 176:k 172:T 168:= 160:i 157:j 154:k 150:T 143:= 135:i 132:k 129:j 125:T 121:= 113:k 110:i 107:j 103:T 96:= 88:k 85:j 82:i 78:T 20:)

Index

Completely antisymmetric tensor
mathematics
theoretical physics
tensor
sign
tensor field
order
differential k {\displaystyle k} -form
k {\displaystyle k} -vector
contraction
generalized Kronecker delta
Einstein summation convention
electromagnetic tensor
electromagnetism
Riemannian volume form
pseudo-Riemannian manifold
Antisymmetric matrix
Exterior algebra
Levi-Civita symbol
Ricci calculus
Symmetric tensor
Symmetrization
Mathematical methods for physics and engineering
ISBN
978-0-521-86153-3
From Vectors to Tensors
ISBN
978-3-540-22887-5
Penrose, Roger
The Road to Reality

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