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Square root of a 2 by 2 matrix

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1059: 458: 1054:{\displaystyle {\begin{aligned}R^{2}&={\frac {1}{t^{2}}}{\begin{pmatrix}A^{2}+BC+2sA+s^{2}&AB+BD+2sB\\CA+DC+2sC&CB+D^{2}+2sD+s^{2}\end{pmatrix}}\\&={\frac {1}{t^{2}}}{\begin{pmatrix}A^{2}+BC+2sA+AD-BC&AB+BD+2sB\\AC+CD+2sC&BC+D^{2}+2sD+AD-BC\end{pmatrix}}\\&={\frac {1}{A+D+2s}}{\begin{pmatrix}A(A+D+2s)&B(A+D+2s)\\C(A+D+2s)&D(A+D+2s)\end{pmatrix}}=M.\end{aligned}}} 2056: 1576: 1386: 447: 1226: 1945: 1936: 2224: 1470: 320: 463: 1266: 1840: 1758: 175: 333: 1137: 2128: 1700: 2297: 2152: 2411: 260: 1886: 1783: 118: 2051:{\displaystyle {\frac {1}{t}}{\begin{pmatrix}s&r\\r&-s\end{pmatrix}}{\text{ and }}{\begin{pmatrix}\pm 1&0\\0&\pm 1\end{pmatrix}},} 1571:{\displaystyle R={\begin{pmatrix}0&0\\c&0\end{pmatrix}}\quad {\text{and}}\quad R={\begin{pmatrix}0&b\\0&0\end{pmatrix}},} 1705: 1381:{\displaystyle R=\pm {\frac {1}{t}}{\begin{pmatrix}A+s&B\\C&D+s\end{pmatrix}}=\pm {\frac {1}{t}}\left(M+sI\right),} 442:{\displaystyle R={\frac {1}{t}}{\begin{pmatrix}A+s&B\\C&D+s\end{pmatrix}}={\frac {1}{t}}\left(M+sI\right).} 2336: 1860:. This, for the various sign choices, gives four, two, or one distinct matrices, if none of, only one of, or both 2415: 1130:
is nonzero, the general formula above will give only two distinct solutions, corresponding to the two signs of
104: 51: 206: 2077: 1221:{\displaystyle R=\pm {\frac {1}{t}}{\begin{pmatrix}A&B\\C&D\end{pmatrix}}=\pm {\frac {1}{t}}M,} 2344: 2301: 24: 115:
The following is a general formula that applies to almost any 2 × 2 matrix. Let the given matrix be
2386:
Mitchell, Douglas W. (November 2003), "87.57 Using Pythagorean triples to generate square roots of
2434: 2361: 2318: 1664: 2276: 2457: 1610: 2424: 2353: 2310: 1939: 1622: 2389: 2373: 1621:, then if it is not the identity matrix, its determinant is zero, and its trace equals its 2369: 1881: 43: 1443:, so that both the trace and the determinant of the matrix are zero. In this case, if 2451: 2357: 2314: 1931:{\displaystyle \left({\begin{smallmatrix}1&0\\0&1\end{smallmatrix}}\right)} 50:
with itself. In general, there can be zero, two, four, or even an infinitude of
2219:{\displaystyle R={\begin{pmatrix}a&0\\{\frac {C}{a+d}}&d\end{pmatrix}}.} 1896: 226: 2429: 1877: 1252: 100: 1071:
is a real matrix; this will be the case, in particular, if the determinant
315:{\displaystyle s=\pm {\sqrt {\delta }},\qquad t=\pm {\sqrt {\tau +2s}}.} 2438: 2365: 2322: 1625:, which (excluding the zero matrix) is 1. Then the above formula has 1835:{\displaystyle R={\begin{pmatrix}a&0\\0&d\end{pmatrix}},} 1753:{\displaystyle \pm {\sqrt {r}}\exp \left({\tfrac {1}{2}}A\right)} 1657:
can be expressed as real multiple of the exponent of some matrix
1102:. Then the formula above will provide four distinct square roots 170:{\displaystyle M={\begin{pmatrix}A&B\\C&D\end{pmatrix}},} 61:
Square roots that are not the all-zeros matrix come in pairs: if
2273:
Levinger, Bernard W. (September 1980), "The square root of a
2244:= 0, and four otherwise. A similar formula can be used when 2167: 2008: 1964: 1798: 1731: 1534: 1485: 1294: 1239:
The formula also gives only two distinct solutions if
1165: 911: 698: 505: 358: 133: 2392: 2279: 2155: 2080: 1948: 1889: 1786: 1708: 1667: 1473: 1269: 1140: 461: 336: 263: 121: 1463:= 0), then the null matrix is also a square root of 2405: 2291: 2218: 2122: 2050: 1930: 1834: 1752: 1694: 1570: 1380: 1220: 1053: 441: 314: 193:may be real or complex numbers. Furthermore, let 169: 107:has precisely one positive-definite square root. 1588:are arbitrary real or complex values. Otherwise 2335:Harkin, Anthony A.; Harkin, Joseph B. (2004), 8: 2228:This formula will provide two solutions if 1263:be zero. In that case, the two roots are 2428: 2397: 2391: 2337:"Geometry of generalized complex numbers" 2278: 2182: 2162: 2154: 2111: 2098: 2085: 2079: 2003: 1998: 1959: 1949: 1947: 1894: 1888: 1793: 1785: 1780:= 0), one can use the simplified formula 1730: 1712: 1707: 1666: 1529: 1517: 1480: 1472: 1343: 1289: 1279: 1268: 1202: 1160: 1150: 1139: 1078:The general case of this formula is when 906: 879: 825: 705: 693: 685: 676: 652: 627: 546: 512: 500: 492: 483: 470: 462: 460: 404: 353: 343: 335: 293: 273: 262: 128: 120: 1760:. In this case the square root is real. 1255:), in which case one of the choices for 58:can be obtained by an explicit formula. 2265: 99:A 2×2 matrix with two distinct nonzero 1419:The formula above fails completely if 1098:is nonzero for each choice of sign of 7: 1702:, then two of its square roots are 1106:, one for each choice of signs for 2123:{\displaystyle r^{2}+s^{2}=t^{2}.} 2074:are any complex numbers such that 14: 2133:Matrix with one off-diagonal zero 1895: 1067:may have complex entries even if 1942:rational square roots given by 1232:is any square root of the trace 2149:are not both zero, one can use 1522: 1516: 283: 54:. In many cases, such a matrix 2358:10.1080/0025570X.2004.11953236 2315:10.1080/0025570X.1980.11976858 1689: 1683: 1027: 1006: 998: 977: 967: 946: 938: 917: 1: 1596:Formulas for special matrices 1118:Special cases of the formula 1427:are both zero; that is, if 18:square root of a 2×2 matrix 2474: 1695:{\displaystyle M=r\exp(A)} 1259:will make the denominator 2430:10.1017/S0025557200173723 2292:{\displaystyle 2\times 2} 1876:Because it has duplicate 1447:is the null matrix (with 103:has four square roots. A 73:is also a square root of 2416:The Mathematical Gazette 1868:are zero, respectively. 105:positive-definite matrix 1641:as two square roots of 1251:(the case of duplicate 1126:is zero, but the trace 2407: 2293: 2220: 2124: 2052: 1932: 1836: 1772:is diagonal (that is, 1754: 1696: 1572: 1408:is any square root of 1392:is the square root of 1382: 1222: 1055: 451:Indeed, the square of 443: 326:≠ 0, a square root of 316: 171: 2408: 2406:{\displaystyle I_{2}} 2294: 2221: 2125: 2053: 1933: 1837: 1755: 1697: 1573: 1383: 1223: 1056: 444: 317: 172: 2390: 2345:Mathematics Magazine 2302:Mathematics Magazine 2277: 2153: 2078: 1946: 1938:has infinitely many 1887: 1784: 1706: 1665: 1592:has no square root. 1471: 1267: 1138: 459: 334: 261: 119: 65:is a square root of 52:square-root matrices 2256:are not both zero. 1467:, as is any matrix 1122:If the determinant 2403: 2289: 2216: 2207: 2120: 2048: 2039: 1992: 1928: 1922: 1921: 1832: 1823: 1750: 1740: 1692: 1649:Exponential matrix 1568: 1559: 1510: 1378: 1331: 1218: 1190: 1051: 1049: 1032: 863: 660: 439: 395: 312: 167: 158: 2198: 2001: 1957: 1739: 1717: 1611:idempotent matrix 1601:Idempotent matrix 1520: 1351: 1287: 1210: 1158: 904: 691: 498: 412: 351: 307: 278: 111:A general formula 2465: 2442: 2441: 2432: 2423:(510): 499–500, 2412: 2410: 2409: 2404: 2402: 2401: 2383: 2377: 2376: 2341: 2332: 2326: 2325: 2298: 2296: 2295: 2290: 2270: 2225: 2223: 2222: 2217: 2212: 2211: 2199: 2197: 2183: 2129: 2127: 2126: 2121: 2116: 2115: 2103: 2102: 2090: 2089: 2073: 2057: 2055: 2054: 2049: 2044: 2043: 2002: 1999: 1997: 1996: 1958: 1950: 1937: 1935: 1934: 1929: 1927: 1923: 1841: 1839: 1838: 1833: 1828: 1827: 1759: 1757: 1756: 1751: 1749: 1745: 1741: 1732: 1718: 1713: 1701: 1699: 1698: 1693: 1577: 1575: 1574: 1569: 1564: 1563: 1521: 1518: 1515: 1514: 1387: 1385: 1384: 1379: 1374: 1370: 1352: 1344: 1336: 1335: 1288: 1280: 1243:is nonzero, and 1227: 1225: 1224: 1219: 1211: 1203: 1195: 1194: 1159: 1151: 1094:is nonzero, and 1090:, in which case 1082:is nonzero, and 1060: 1058: 1057: 1052: 1050: 1037: 1036: 905: 903: 880: 872: 868: 867: 830: 829: 710: 709: 692: 690: 689: 677: 669: 665: 664: 657: 656: 632: 631: 551: 550: 517: 516: 499: 497: 496: 484: 475: 474: 448: 446: 445: 440: 435: 431: 413: 405: 400: 399: 352: 344: 321: 319: 318: 313: 308: 294: 279: 274: 176: 174: 173: 168: 163: 162: 2473: 2472: 2468: 2467: 2466: 2464: 2463: 2462: 2448: 2447: 2446: 2445: 2393: 2388: 2387: 2385: 2384: 2380: 2339: 2334: 2333: 2329: 2275: 2274: 2272: 2271: 2267: 2262: 2206: 2205: 2200: 2187: 2179: 2178: 2173: 2163: 2151: 2150: 2135: 2107: 2094: 2081: 2076: 2075: 2059: 2038: 2037: 2029: 2023: 2022: 2017: 2004: 2000: and  1991: 1990: 1982: 1976: 1975: 1970: 1960: 1944: 1943: 1920: 1919: 1914: 1908: 1907: 1902: 1890: 1885: 1884: 1882:identity matrix 1874: 1872:Identity matrix 1822: 1821: 1816: 1810: 1809: 1804: 1794: 1782: 1781: 1766: 1764:Diagonal matrix 1729: 1725: 1704: 1703: 1663: 1662: 1651: 1613:, meaning that 1603: 1598: 1558: 1557: 1552: 1546: 1545: 1540: 1530: 1509: 1508: 1503: 1497: 1496: 1491: 1481: 1469: 1468: 1357: 1353: 1330: 1329: 1318: 1312: 1311: 1306: 1290: 1265: 1264: 1189: 1188: 1183: 1177: 1176: 1171: 1161: 1136: 1135: 1120: 1075:is negative. 1048: 1047: 1031: 1030: 1001: 971: 970: 941: 907: 884: 870: 869: 862: 861: 821: 810: 780: 779: 750: 701: 694: 681: 667: 666: 659: 658: 648: 623: 612: 582: 581: 552: 542: 508: 501: 488: 476: 466: 457: 456: 418: 414: 394: 393: 382: 376: 375: 370: 354: 332: 331: 259: 258: 157: 156: 151: 145: 144: 139: 129: 117: 116: 113: 98: 42:stands for the 23:is another 2×2 12: 11: 5: 2471: 2469: 2461: 2460: 2450: 2449: 2444: 2443: 2400: 2396: 2378: 2352:(2): 118–129, 2327: 2309:(4): 222–224, 2288: 2285: 2282: 2264: 2263: 2261: 2258: 2215: 2210: 2204: 2201: 2196: 2193: 2190: 2186: 2181: 2180: 2177: 2174: 2172: 2169: 2168: 2166: 2161: 2158: 2134: 2131: 2119: 2114: 2110: 2106: 2101: 2097: 2093: 2088: 2084: 2047: 2042: 2036: 2033: 2030: 2028: 2025: 2024: 2021: 2018: 2016: 2013: 2010: 2009: 2007: 1995: 1989: 1986: 1983: 1981: 1978: 1977: 1974: 1971: 1969: 1966: 1965: 1963: 1956: 1953: 1926: 1918: 1915: 1913: 1910: 1909: 1906: 1903: 1901: 1898: 1897: 1893: 1873: 1870: 1831: 1826: 1820: 1817: 1815: 1812: 1811: 1808: 1805: 1803: 1800: 1799: 1797: 1792: 1789: 1765: 1762: 1748: 1744: 1738: 1735: 1728: 1724: 1721: 1716: 1711: 1691: 1688: 1685: 1682: 1679: 1676: 1673: 1670: 1653:If the matrix 1650: 1647: 1602: 1599: 1597: 1594: 1567: 1562: 1556: 1553: 1551: 1548: 1547: 1544: 1541: 1539: 1536: 1535: 1533: 1528: 1525: 1513: 1507: 1504: 1502: 1499: 1498: 1495: 1492: 1490: 1487: 1486: 1484: 1479: 1476: 1412: − 2 1400: − 2 1377: 1373: 1369: 1366: 1363: 1360: 1356: 1350: 1347: 1342: 1339: 1334: 1328: 1325: 1322: 1319: 1317: 1314: 1313: 1310: 1307: 1305: 1302: 1299: 1296: 1295: 1293: 1286: 1283: 1278: 1275: 1272: 1217: 1214: 1209: 1206: 1201: 1198: 1193: 1187: 1184: 1182: 1179: 1178: 1175: 1172: 1170: 1167: 1166: 1164: 1157: 1154: 1149: 1146: 1143: 1119: 1116: 1046: 1043: 1040: 1035: 1029: 1026: 1023: 1020: 1017: 1014: 1011: 1008: 1005: 1002: 1000: 997: 994: 991: 988: 985: 982: 979: 976: 973: 972: 969: 966: 963: 960: 957: 954: 951: 948: 945: 942: 940: 937: 934: 931: 928: 925: 922: 919: 916: 913: 912: 910: 902: 899: 896: 893: 890: 887: 883: 878: 875: 873: 871: 866: 860: 857: 854: 851: 848: 845: 842: 839: 836: 833: 828: 824: 820: 817: 814: 811: 809: 806: 803: 800: 797: 794: 791: 788: 785: 782: 781: 778: 775: 772: 769: 766: 763: 760: 757: 754: 751: 749: 746: 743: 740: 737: 734: 731: 728: 725: 722: 719: 716: 713: 708: 704: 700: 699: 697: 688: 684: 680: 675: 672: 670: 668: 663: 655: 651: 647: 644: 641: 638: 635: 630: 626: 622: 619: 616: 613: 611: 608: 605: 602: 599: 596: 593: 590: 587: 584: 583: 580: 577: 574: 571: 568: 565: 562: 559: 556: 553: 549: 545: 541: 538: 535: 532: 529: 526: 523: 520: 515: 511: 507: 506: 504: 495: 491: 487: 482: 479: 477: 473: 469: 465: 464: 438: 434: 430: 427: 424: 421: 417: 411: 408: 403: 398: 392: 389: 386: 383: 381: 378: 377: 374: 371: 369: 366: 363: 360: 359: 357: 350: 347: 342: 339: 311: 306: 303: 300: 297: 292: 289: 286: 282: 277: 272: 269: 266: 166: 161: 155: 152: 150: 147: 146: 143: 140: 138: 135: 134: 132: 127: 124: 112: 109: 44:matrix product 13: 10: 9: 6: 4: 3: 2: 2470: 2459: 2456: 2455: 2453: 2440: 2436: 2431: 2426: 2422: 2418: 2417: 2398: 2394: 2382: 2379: 2375: 2371: 2367: 2363: 2359: 2355: 2351: 2347: 2346: 2338: 2331: 2328: 2324: 2320: 2316: 2312: 2308: 2304: 2303: 2286: 2283: 2280: 2269: 2266: 2259: 2257: 2255: 2251: 2248:is zero, but 2247: 2243: 2239: 2235: 2231: 2226: 2213: 2208: 2202: 2194: 2191: 2188: 2184: 2175: 2170: 2164: 2159: 2156: 2148: 2144: 2141:is zero, but 2140: 2132: 2130: 2117: 2112: 2108: 2104: 2099: 2095: 2091: 2086: 2082: 2071: 2067: 2063: 2045: 2040: 2034: 2031: 2026: 2019: 2014: 2011: 2005: 1993: 1987: 1984: 1979: 1972: 1967: 1961: 1954: 1951: 1941: 1924: 1916: 1911: 1904: 1899: 1891: 1883: 1879: 1871: 1869: 1867: 1863: 1859: 1855: 1851: 1847: 1842: 1829: 1824: 1818: 1813: 1806: 1801: 1795: 1790: 1787: 1779: 1775: 1771: 1763: 1761: 1746: 1742: 1736: 1733: 1726: 1722: 1719: 1714: 1709: 1686: 1680: 1677: 1674: 1671: 1668: 1660: 1656: 1648: 1646: 1644: 1640: 1636: 1632: 1628: 1624: 1620: 1616: 1612: 1608: 1600: 1595: 1593: 1591: 1587: 1583: 1578: 1565: 1560: 1554: 1549: 1542: 1537: 1531: 1526: 1523: 1511: 1505: 1500: 1493: 1488: 1482: 1477: 1474: 1466: 1462: 1458: 1454: 1450: 1446: 1442: 1438: 1434: 1430: 1426: 1422: 1417: 1415: 1411: 1407: 1404:nonzero, and 1403: 1399: 1395: 1391: 1375: 1371: 1367: 1364: 1361: 1358: 1354: 1348: 1345: 1340: 1337: 1332: 1326: 1323: 1320: 1315: 1308: 1303: 1300: 1297: 1291: 1284: 1281: 1276: 1273: 1270: 1262: 1258: 1254: 1250: 1246: 1242: 1237: 1235: 1231: 1215: 1212: 1207: 1204: 1199: 1196: 1191: 1185: 1180: 1173: 1168: 1162: 1155: 1152: 1147: 1144: 1141: 1133: 1129: 1125: 1117: 1115: 1113: 1109: 1105: 1101: 1097: 1093: 1089: 1085: 1081: 1076: 1074: 1070: 1066: 1061: 1044: 1041: 1038: 1033: 1024: 1021: 1018: 1015: 1012: 1009: 1003: 995: 992: 989: 986: 983: 980: 974: 964: 961: 958: 955: 952: 949: 943: 935: 932: 929: 926: 923: 920: 914: 908: 900: 897: 894: 891: 888: 885: 881: 876: 874: 864: 858: 855: 852: 849: 846: 843: 840: 837: 834: 831: 826: 822: 818: 815: 812: 807: 804: 801: 798: 795: 792: 789: 786: 783: 776: 773: 770: 767: 764: 761: 758: 755: 752: 747: 744: 741: 738: 735: 732: 729: 726: 723: 720: 717: 714: 711: 706: 702: 695: 686: 682: 678: 673: 671: 661: 653: 649: 645: 642: 639: 636: 633: 628: 624: 620: 617: 614: 609: 606: 603: 600: 597: 594: 591: 588: 585: 578: 575: 572: 569: 566: 563: 560: 557: 554: 547: 543: 539: 536: 533: 530: 527: 524: 521: 518: 513: 509: 502: 493: 489: 485: 480: 478: 471: 467: 454: 449: 436: 432: 428: 425: 422: 419: 415: 409: 406: 401: 396: 390: 387: 384: 379: 372: 367: 364: 361: 355: 348: 345: 340: 337: 329: 325: 309: 304: 301: 298: 295: 290: 287: 284: 280: 275: 270: 267: 264: 256: 252: 248: 245:be such that 244: 240: 236: 233:be such that 232: 228: 224: 220: 216: 212: 208: 204: 200: 196: 192: 188: 184: 180: 164: 159: 153: 148: 141: 136: 130: 125: 122: 110: 108: 106: 102: 96: 92: 88: 85:) = (−1)(−1)( 84: 80: 76: 72: 68: 64: 59: 57: 53: 49: 45: 41: 37: 33: 29: 26: 22: 19: 2420: 2414: 2381: 2349: 2343: 2330: 2306: 2300: 2268: 2253: 2249: 2245: 2241: 2237: 2233: 2229: 2227: 2146: 2142: 2138: 2136: 2069: 2065: 2061: 1875: 1865: 1861: 1857: 1853: 1849: 1845: 1843: 1777: 1773: 1769: 1767: 1658: 1654: 1652: 1642: 1638: 1634: 1633:= 1, giving 1630: 1626: 1618: 1614: 1606: 1604: 1589: 1585: 1581: 1579: 1464: 1460: 1456: 1452: 1448: 1444: 1440: 1436: 1432: 1428: 1424: 1420: 1418: 1413: 1409: 1405: 1401: 1397: 1393: 1389: 1260: 1256: 1248: 1244: 1240: 1238: 1233: 1229: 1131: 1127: 1123: 1121: 1111: 1107: 1103: 1099: 1095: 1091: 1087: 1083: 1079: 1077: 1072: 1068: 1064: 1062: 452: 450: 327: 323: 257:. That is, 254: 250: 246: 242: 238: 234: 230: 222: 218: 214: 210: 202: 198: 194: 190: 186: 182: 178: 114: 94: 90: 86: 82: 78: 74: 70: 66: 62: 60: 55: 47: 39: 35: 31: 27: 20: 17: 15: 1878:eigenvalues 1396:that makes 1253:eigenvalues 1134:. Namely, 227:determinant 101:eigenvalues 2260:References 1880:, the 2×2 1063:Note that 77:, since (− 30:such that 2299:matrix", 2284:× 2032:± 2012:± 1985:− 1940:symmetric 1723:⁡ 1710:± 1681:⁡ 1341:± 1277:± 1200:± 1148:± 853:− 742:− 322:Then, if 296:τ 291:± 276:δ 271:± 2458:Matrices 2452:Category 1629:= 0 and 69:, then − 38:, where 2439:3621289 2374:1573734 2366:3219099 2323:2689616 2240:= 0 or 229:. Let 225:be its 205:be the 2437:  2372:  2364:  2321:  2058:where 1852:, and 1844:where 1609:is an 1580:where 1435:, and 1388:where 1228:where 241:, and 213:, and 189:, and 177:where 25:matrix 2435:JSTOR 2362:JSTOR 2340:(PDF) 2319:JSTOR 1637:and − 207:trace 2252:and 2145:and 1864:and 1856:= ±√ 1848:= ±√ 1623:rank 1584:and 1423:and 1110:and 455:is 89:) = 2425:doi 2413:", 2354:doi 2311:doi 2236:or 2137:If 1768:If 1720:exp 1678:exp 1605:If 1519:and 1439:= − 1431:= − 1247:= 4 1086:≠ 4 330:is 209:of 81:)(− 46:of 2454:: 2433:, 2421:87 2419:, 2370:MR 2368:, 2360:, 2350:77 2348:, 2342:, 2317:, 2307:53 2305:, 2232:= 2068:, 2064:, 1776:= 1661:, 1645:. 1617:= 1615:MM 1459:= 1455:= 1451:= 1441:BC 1416:. 1236:. 1114:. 255:2s 253:+ 249:= 237:= 223:BC 221:− 219:AD 217:= 201:+ 197:= 185:, 181:, 93:= 87:RR 34:= 16:A 2427:: 2399:2 2395:I 2356:: 2313:: 2287:2 2281:2 2254:D 2250:A 2246:C 2242:D 2238:A 2234:D 2230:A 2214:. 2209:) 2203:d 2195:d 2192:+ 2189:a 2185:C 2176:0 2171:a 2165:( 2160:= 2157:R 2147:D 2143:A 2139:B 2118:. 2113:2 2109:t 2105:= 2100:2 2096:s 2092:+ 2087:2 2083:r 2072:) 2070:t 2066:s 2062:r 2060:( 2046:, 2041:) 2035:1 2027:0 2020:0 2015:1 2006:( 1994:) 1988:s 1980:r 1973:r 1968:s 1962:( 1955:t 1952:1 1925:) 1917:1 1912:0 1905:0 1900:1 1892:( 1866:D 1862:A 1858:D 1854:d 1850:A 1846:a 1830:, 1825:) 1819:d 1814:0 1807:0 1802:a 1796:( 1791:= 1788:R 1778:C 1774:B 1770:M 1747:) 1743:A 1737:2 1734:1 1727:( 1715:r 1690:) 1687:A 1684:( 1675:r 1672:= 1669:M 1659:A 1655:M 1643:M 1639:M 1635:M 1631:τ 1627:s 1619:M 1607:M 1590:M 1586:c 1582:b 1566:, 1561:) 1555:0 1550:0 1543:b 1538:0 1532:( 1527:= 1524:R 1512:) 1506:0 1501:c 1494:0 1489:0 1483:( 1478:= 1475:R 1465:M 1461:D 1457:C 1453:B 1449:A 1445:M 1437:A 1433:A 1429:D 1425:τ 1421:δ 1414:s 1410:τ 1406:t 1402:s 1398:τ 1394:δ 1390:s 1376:, 1372:) 1368:I 1365:s 1362:+ 1359:M 1355:( 1349:t 1346:1 1338:= 1333:) 1327:s 1324:+ 1321:D 1316:C 1309:B 1304:s 1301:+ 1298:A 1292:( 1285:t 1282:1 1274:= 1271:R 1261:t 1257:s 1249:δ 1245:τ 1241:δ 1234:τ 1230:t 1216:, 1213:M 1208:t 1205:1 1197:= 1192:) 1186:D 1181:C 1174:B 1169:A 1163:( 1156:t 1153:1 1145:= 1142:R 1132:t 1128:τ 1124:δ 1112:t 1108:s 1104:R 1100:s 1096:t 1092:s 1088:δ 1084:τ 1080:δ 1073:δ 1069:M 1065:R 1045:. 1042:M 1039:= 1034:) 1028:) 1025:s 1022:2 1019:+ 1016:D 1013:+ 1010:A 1007:( 1004:D 999:) 996:s 993:2 990:+ 987:D 984:+ 981:A 978:( 975:C 968:) 965:s 962:2 959:+ 956:D 953:+ 950:A 947:( 944:B 939:) 936:s 933:2 930:+ 927:D 924:+ 921:A 918:( 915:A 909:( 901:s 898:2 895:+ 892:D 889:+ 886:A 882:1 877:= 865:) 859:C 856:B 850:D 847:A 844:+ 841:D 838:s 835:2 832:+ 827:2 823:D 819:+ 816:C 813:B 808:C 805:s 802:2 799:+ 796:D 793:C 790:+ 787:C 784:A 777:B 774:s 771:2 768:+ 765:D 762:B 759:+ 756:B 753:A 748:C 745:B 739:D 736:A 733:+ 730:A 727:s 724:2 721:+ 718:C 715:B 712:+ 707:2 703:A 696:( 687:2 683:t 679:1 674:= 662:) 654:2 650:s 646:+ 643:D 640:s 637:2 634:+ 629:2 625:D 621:+ 618:B 615:C 610:C 607:s 604:2 601:+ 598:C 595:D 592:+ 589:A 586:C 579:B 576:s 573:2 570:+ 567:D 564:B 561:+ 558:B 555:A 548:2 544:s 540:+ 537:A 534:s 531:2 528:+ 525:C 522:B 519:+ 514:2 510:A 503:( 494:2 490:t 486:1 481:= 472:2 468:R 453:R 437:. 433:) 429:I 426:s 423:+ 420:M 416:( 410:t 407:1 402:= 397:) 391:s 388:+ 385:D 380:C 373:B 368:s 365:+ 362:A 356:( 349:t 346:1 341:= 338:R 328:M 324:t 310:. 305:s 302:2 299:+ 288:= 285:t 281:, 268:= 265:s 251:τ 247:t 243:t 239:δ 235:s 231:s 215:δ 211:M 203:D 199:A 195:τ 191:D 187:C 183:B 179:A 165:, 160:) 154:D 149:C 142:B 137:A 131:( 126:= 123:M 97:. 95:M 91:R 83:R 79:R 75:M 71:R 67:M 63:R 56:R 48:R 40:R 36:R 32:M 28:R 21:M

Index

matrix
matrix product
square-root matrices
eigenvalues
positive-definite matrix
trace
determinant
eigenvalues
idempotent matrix
rank
eigenvalues
identity matrix
symmetric
Mathematics Magazine
doi
10.1080/0025570X.1980.11976858
JSTOR
2689616
"Geometry of generalized complex numbers"
Mathematics Magazine
doi
10.1080/0025570X.2004.11953236
JSTOR
3219099
MR
1573734
The Mathematical Gazette
doi
10.1017/S0025557200173723
JSTOR

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