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Automorphism group

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has additional structure, then it may be the case that not all bijections on the set preserve this structure, in which case the automorphism group will be a subgroup of the symmetric group on
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Now base extensions applied to the above discussion determines a functor: namely, for each
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In general, however, an automorphism group functor may not be represented by a scheme.
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is a module category like the category of finite-dimensional vector spaces, then
1214: 1193:{\displaystyle \operatorname {Aut} (P)\hookrightarrow \operatorname {GL} _{n}(R)} 189: 169: 141: 2674: 130: 2979: 573:
has a structure of a Lie group induced from that on the automorphism group of
468:{\displaystyle {\overline {a}}\mapsto \sigma _{a}\in G,\,\sigma _{a}(x)=x^{a}} 3132: 3005: 2600: 2281: 496: 1392:. In practical terms, this says that a different choice of a base point of 606: 324: 235: 59: 36: 1754:{\displaystyle \operatorname {Aut} (X_{1})\to \operatorname {Aut} (X_{2})} 3048: 2060: 886: 503: 129:
Especially in geometric contexts, an automorphism group is also called a
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https://mathoverflow.net/questions/55042/automorphism-group-of-a-scheme
2881: 2324: 2071: 1241: 2974:, Readings in Mathematics. Vol. 129. New York: Springer-Verlag. 1141: 928: 848:; these representations are the main object of study in the field of 530: 2888: 1927: 1233: 48: 2327:, and the invertibility is again described by polynomials. Hence, 164:
to itself is an automorphism, and hence the automorphism group of
1620: 140:
Automorphism groups are studied in a general way in the field of
3101:. Graduate Texts in Mathematics. Vol. 66. Springer Verlag. 2868:
Hochschild, G. (1952). "The Automorphism Group of a Lie Group".
1080: 3057:. Annals of Mathematics Studies. Vol. 72. Princeton, NJ: 2506:{\displaystyle \operatorname {End} _{\text{alg}}(M\otimes R)} 2461:{\displaystyle \operatorname {End} _{\text{alg}}(M\otimes R)} 16:
Mathematical group formed from the automorphisms of an object
133:. A subgroup of an automorphism group is sometimes called a 1761:, as it maps invertible morphisms to invertible morphisms. 2592:{\displaystyle R\mapsto \operatorname {Aut} (M\otimes R)} 2043:
that is equipped with some algebraic structure (that is,
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as a group of linear transformations (automorphisms) of
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a category, is called an action or a representation of
379:{\displaystyle (\mathbb {Z} /n\mathbb {Z} )^{\times }} 160:
with no additional structure, then any bijection from
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Here are some other facts about automorphism groups:
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has more structure than just a set. For example, if
776: 763:{\displaystyle \varphi :G\to \operatorname {Aut} (X)} 732: 639: 579: 551: 511: 481: 399: 344: 309: 265: 197: 92: 2795:
is a central subgroup and the automorphism group of
2316:{\displaystyle \operatorname {End} _{\text{alg}}(M)} 2205:{\displaystyle \operatorname {End} _{\text{alg}}(M)} 2134:{\displaystyle \operatorname {End} _{\text{alg}}(M)} 1349:{\displaystyle A\mathrel {\overset {\sim }{\to }} B} 956:{\displaystyle A\mathrel {\overset {\sim }{\to }} B} 502:
The automorphism group of a finite-dimensional real
2725:. Second, every connected Lie group is of the form 2099:that preserve the algebraic structure: they form a 2811: 2783: 2754: 2717: 2643: 2591: 2547: 2505: 2460: 2415: 2351: 2315: 2272: 2236: 2204: 2165: 2133: 2091: 2039:be a finite-dimensional vector space over a field 2031: 2003: 1983: 1963: 1941: 1918: 1898: 1878: 1837: 1800: 1753: 1689: 1669: 1642: 1611: 1565: 1538: 1511: 1484: 1454: 1422: 1380: 1348: 1315: 1277: 1192: 1107: 1071: 1025: 995:, which is a symmetric group (see above), acts on 987: 955: 919: 877: 806: 762: 718: 589: 561: 521: 487: 467: 378: 315: 293: 219:is the group consisting of field automorphisms of 211: 110: 2870:Transactions of the American Mathematical Society 2423:preserving the algebraic structure: denote it by 3130: 2548:{\displaystyle \operatorname {Aut} (M\otimes R)} 184:. Some examples of this include the following: 2697:is simply connected, the automorphism group of 538: 1772:with a single object * or, more generally, if 1232:is the group consisting of all the invertible 1228:in a category, then the automorphism group of 2671:, a technique to remove an automorphism group 2014: 1213:Automorphism groups appear very naturally in 2958: 2936:Dummit, David S.; Foote, Richard M. (2004). 2894: 294:{\displaystyle \operatorname {PGL} _{n}(k).} 3026:, vol. 52, New York: Springer-Verlag, 2935: 2855: 1285:are objects in some category, then the set 3091: 3012: 2918: 2867: 2843: 1879:{\displaystyle F(\operatorname {Obj} (G))} 822:is a vector space, then a group action of 2468:. Then the unit group of the matrix ring 1935: 1423:{\displaystyle \operatorname {Iso} (A,B)} 1316:{\displaystyle \operatorname {Iso} (A,B)} 1072:{\displaystyle \operatorname {Iso} (A,B)} 1026:{\displaystyle \operatorname {Iso} (A,B)} 920:{\displaystyle \operatorname {Iso} (A,B)} 814:. This extends to the case when the set 684: 664: 432: 362: 349: 2416:{\displaystyle M\otimes R\to M\otimes R} 388:multiplicative group of integers modulo 86:is a group, then its automorphism group 2644:{\displaystyle \operatorname {Aut} (M)} 2352:{\displaystyle \operatorname {Aut} (M)} 2273:{\displaystyle \operatorname {End} (M)} 2237:{\displaystyle \operatorname {Aut} (M)} 2166:{\displaystyle \operatorname {End} (M)} 1455:{\displaystyle \operatorname {Aut} (B)} 1430:differs unambiguously by an element of 1381:{\displaystyle \operatorname {Aut} (B)} 1116: 1108:{\displaystyle \operatorname {Aut} (B)} 988:{\displaystyle \operatorname {Aut} (B)} 234:, the automorphism group is called the 111:{\displaystyle \operatorname {Aut} (X)} 3131: 3047: 2906: 2968:Representation theory. A first course 1208: 807:{\displaystyle g\cdot x=\varphi (g)x} 726:, and, conversely, each homomorphism 3098:Introduction to Affine Group Schemes 2791:is a simply connected Lie group and 1886:. Those objects are then said to be 2710: 625:and conversely. Indeed, each left 582: 554: 514: 13: 3054:Introduction to algebraic K-theory 2755:{\displaystyle {\widetilde {G}}/C} 14: 3150: 3117: 1776:is a groupoid, then each functor 569:, then the automorphism group of 62:, then the automorphism group of 2784:{\displaystyle {\widetilde {G}}} 1612:{\displaystyle F:C_{1}\to C_{2}} 545:is a Lie group with Lie algebra 393:, with the isomorphism given by 2718:{\displaystyle {\mathfrak {g}}} 1906:-objects (as they are acted by 885:be two finite sets of the same 590:{\displaystyle {\mathfrak {g}}} 562:{\displaystyle {\mathfrak {g}}} 522:{\displaystyle {\mathfrak {g}}} 118:is the group consisting of all 2912: 2900: 2861: 2849: 2837: 2687: 2638: 2632: 2586: 2574: 2565: 2542: 2530: 2500: 2488: 2455: 2443: 2401: 2346: 2340: 2310: 2304: 2267: 2261: 2231: 2225: 2199: 2193: 2160: 2154: 2128: 2122: 2083: 2055:). It can be, for example, an 1873: 1870: 1864: 1855: 1832: 1826: 1792: 1748: 1735: 1726: 1723: 1710: 1596: 1449: 1443: 1417: 1405: 1375: 1369: 1335: 1310: 1298: 1187: 1181: 1165: 1162: 1156: 1102: 1096: 1066: 1054: 1020: 1008: 982: 976: 942: 914: 902: 798: 792: 757: 751: 742: 701: 695: 668: 658: 652: 643: 529:has the structure of a (real) 449: 443: 410: 367: 345: 285: 279: 241:The automorphism group of the 168:in this case is precisely the 105: 99: 1: 3024:Graduate Texts in Mathematics 2972:Graduate Texts in Mathematics 2928: 2799:is the automorphism group of 2605:category of commutative rings 1697:induces a group homomorphism 621:to the automorphism group of 2830: 1942:{\displaystyle \mathbb {S} } 405: 230:. If the field extension is 188:The automorphism group of a 7: 2657: 147: 66:is the group of invertible 10: 3155: 3059:Princeton University Press 2517:is the automorphism group 2212:is the automorphism group 2015:Automorphism group functor 1519:are objects in categories 1252:. (For some examples, see 613:, the action amounts to a 2980:10.1007/978-1-4612-0979-9 2617:automorphism group scheme 1991:-objects are also called 2895:Fulton & Harris 1991 2846:, Ch. II, Example 7.1.1. 2680: 2664:Outer automorphism group 2323:is the zero set of some 2047:is a finite-dimensional 1801:{\displaystyle F:G\to C} 2856:Dummit & Foote 2004 1768:is a group viewed as a 533:(in fact, it is even a 303:The automorphism group 258:projective linear group 238:of the field extension. 3093:Waterhouse, William C. 2813: 2785: 2756: 2719: 2645: 2593: 2549: 2507: 2462: 2417: 2361:linear algebraic group 2353: 2317: 2274: 2238: 2206: 2167: 2135: 2093: 2092:{\displaystyle M\to M} 2033: 2005: 1985: 1965: 1943: 1920: 1900: 1880: 1839: 1802: 1755: 1691: 1671: 1644: 1613: 1567: 1540: 1513: 1486: 1456: 1424: 1382: 1350: 1317: 1279: 1194: 1109: 1073: 1027: 989: 957: 921: 879: 808: 764: 720: 591: 563: 535:linear algebraic group 523: 489: 469: 380: 317: 295: 213: 112: 68:linear transformations 2858:, ยง 2.3. Exercise 26. 2814: 2786: 2757: 2720: 2646: 2603:: a functor from the 2594: 2550: 2508: 2463: 2418: 2354: 2318: 2275: 2239: 2207: 2168: 2136: 2094: 2034: 2006: 1986: 1966: 1944: 1921: 1901: 1881: 1840: 1803: 1756: 1692: 1672: 1670:{\displaystyle X_{2}} 1645: 1643:{\displaystyle X_{1}} 1614: 1568: 1566:{\displaystyle C_{2}} 1541: 1539:{\displaystyle C_{1}} 1514: 1512:{\displaystyle X_{2}} 1487: 1485:{\displaystyle X_{1}} 1457: 1425: 1383: 1351: 1318: 1280: 1240:to itself. It is the 1195: 1110: 1074: 1028: 990: 958: 922: 880: 850:representation theory 809: 770:defines an action by 765: 721: 592: 564: 524: 490: 470: 381: 318: 296: 214: 113: 3049:Milnor, John Willard 2803: 2766: 2729: 2705: 2623: 2559: 2521: 2472: 2427: 2389: 2331: 2325:polynomial equations 2288: 2252: 2216: 2177: 2173:. The unit group of 2145: 2106: 2077: 2023: 1995: 1975: 1955: 1931: 1910: 1890: 1849: 1838:{\displaystyle F(*)} 1820: 1780: 1701: 1681: 1654: 1627: 1577: 1550: 1523: 1496: 1469: 1434: 1396: 1360: 1327: 1289: 1263: 1147: 1087: 1045: 999: 967: 934: 893: 863: 833:group representation 774: 730: 637: 577: 549: 509: 479: 397: 342: 307: 263: 195: 135:transformation group 90: 76:general linear group 3139:Group automorphisms 2057:associative algebra 1278:{\displaystyle A,B} 1246:endomorphism monoid 1202:inner automorphisms 1140:. Then there is an 1117:#In category theory 878:{\displaystyle A,B} 212:{\displaystyle L/K} 120:group automorphisms 51:. For example, if 3019:Algebraic Geometry 2809: 2781: 2752: 2715: 2641: 2619:and is denoted by 2613:category of groups 2589: 2545: 2503: 2458: 2413: 2349: 2313: 2270: 2244:. When a basis on 2234: 2202: 2163: 2131: 2089: 2029: 2001: 1981: 1961: 1939: 1916: 1896: 1876: 1835: 1798: 1764:In particular, if 1751: 1687: 1667: 1640: 1609: 1563: 1536: 1509: 1482: 1452: 1420: 1378: 1346: 1313: 1275: 1209:In category theory 1190: 1128:finitely generated 1105: 1069: 1041:; that is to say, 1023: 985: 953: 917: 875: 804: 760: 716: 615:group homomorphism 587: 559: 519: 485: 465: 376: 313: 291: 209: 108: 57:finite-dimensional 25:automorphism group 3033:978-0-387-90244-9 3014:Hartshorne, Robin 2989:978-0-387-97495-8 2951:978-0-471-43334-7 2812:{\displaystyle G} 2778: 2741: 2482: 2437: 2298: 2187: 2116: 2032:{\displaystyle M} 2004:{\displaystyle G} 1984:{\displaystyle G} 1964:{\displaystyle C} 1919:{\displaystyle G} 1899:{\displaystyle G} 1845:, or the objects 1690:{\displaystyle F} 1341: 1131:projective module 948: 629:-action on a set 488:{\displaystyle G} 475:. In particular, 408: 316:{\displaystyle G} 3146: 3112: 3088: 3044: 3009: 2955: 2940:(3rd ed.). 2938:Abstract Algebra 2922: 2916: 2910: 2904: 2898: 2897:, Exercise 8.28. 2892: 2886: 2885: 2865: 2859: 2853: 2847: 2841: 2824: 2818: 2816: 2815: 2810: 2790: 2788: 2787: 2782: 2780: 2779: 2771: 2761: 2759: 2758: 2753: 2748: 2743: 2742: 2734: 2724: 2722: 2721: 2716: 2714: 2713: 2691: 2650: 2648: 2647: 2642: 2598: 2596: 2595: 2590: 2554: 2552: 2551: 2546: 2512: 2510: 2509: 2504: 2484: 2483: 2480: 2467: 2465: 2464: 2459: 2439: 2438: 2435: 2422: 2420: 2419: 2414: 2372:commutative ring 2358: 2356: 2355: 2350: 2322: 2320: 2319: 2314: 2300: 2299: 2296: 2280:is the space of 2279: 2277: 2276: 2271: 2243: 2241: 2240: 2235: 2211: 2209: 2208: 2203: 2189: 2188: 2185: 2172: 2170: 2169: 2164: 2140: 2138: 2137: 2132: 2118: 2117: 2114: 2098: 2096: 2095: 2090: 2038: 2036: 2035: 2030: 2010: 2008: 2007: 2002: 1990: 1988: 1987: 1982: 1970: 1968: 1967: 1962: 1948: 1946: 1945: 1940: 1938: 1925: 1923: 1922: 1917: 1905: 1903: 1902: 1897: 1885: 1883: 1882: 1877: 1844: 1842: 1841: 1836: 1807: 1805: 1804: 1799: 1760: 1758: 1757: 1752: 1747: 1746: 1722: 1721: 1696: 1694: 1693: 1688: 1676: 1674: 1673: 1668: 1666: 1665: 1649: 1647: 1646: 1641: 1639: 1638: 1618: 1616: 1615: 1610: 1608: 1607: 1595: 1594: 1572: 1570: 1569: 1564: 1562: 1561: 1545: 1543: 1542: 1537: 1535: 1534: 1518: 1516: 1515: 1510: 1508: 1507: 1491: 1489: 1488: 1483: 1481: 1480: 1461: 1459: 1458: 1453: 1429: 1427: 1426: 1421: 1387: 1385: 1384: 1379: 1355: 1353: 1352: 1347: 1342: 1334: 1322: 1320: 1319: 1314: 1284: 1282: 1281: 1276: 1199: 1197: 1196: 1191: 1177: 1176: 1114: 1112: 1111: 1106: 1078: 1076: 1075: 1070: 1032: 1030: 1029: 1024: 994: 992: 991: 986: 962: 960: 959: 954: 949: 941: 926: 924: 923: 918: 884: 882: 881: 876: 813: 811: 810: 805: 769: 767: 766: 761: 725: 723: 722: 717: 694: 693: 680: 679: 596: 594: 593: 588: 586: 585: 568: 566: 565: 560: 558: 557: 528: 526: 525: 520: 518: 517: 494: 492: 491: 486: 474: 472: 471: 466: 464: 463: 442: 441: 422: 421: 409: 401: 385: 383: 382: 377: 375: 374: 365: 357: 352: 322: 320: 319: 314: 300: 298: 297: 292: 275: 274: 218: 216: 215: 210: 205: 117: 115: 114: 109: 3154: 3153: 3149: 3148: 3147: 3145: 3144: 3143: 3129: 3128: 3120: 3115: 3109: 3069: 3034: 2990: 2960:Fulton, William 2952: 2931: 2926: 2925: 2919:Waterhouse 2012 2917: 2913: 2905: 2901: 2893: 2889: 2866: 2862: 2854: 2850: 2844:Hartshorne 1977 2842: 2838: 2833: 2828: 2827: 2819:that preserves 2804: 2801: 2800: 2770: 2769: 2767: 2764: 2763: 2744: 2733: 2732: 2730: 2727: 2726: 2709: 2708: 2706: 2703: 2702: 2692: 2688: 2683: 2669:Level structure 2660: 2624: 2621: 2620: 2560: 2557: 2556: 2522: 2519: 2518: 2479: 2475: 2473: 2470: 2469: 2434: 2430: 2428: 2425: 2424: 2390: 2387: 2386: 2381:, consider the 2332: 2329: 2328: 2295: 2291: 2289: 2286: 2285: 2282:square matrices 2253: 2250: 2249: 2217: 2214: 2213: 2184: 2180: 2178: 2175: 2174: 2146: 2143: 2142: 2113: 2109: 2107: 2104: 2103: 2101:vector subspace 2078: 2075: 2074: 2024: 2021: 2020: 2017: 1996: 1993: 1992: 1976: 1973: 1972: 1956: 1953: 1952: 1934: 1932: 1929: 1928: 1911: 1908: 1907: 1891: 1888: 1887: 1850: 1847: 1846: 1821: 1818: 1817: 1781: 1778: 1777: 1742: 1738: 1717: 1713: 1702: 1699: 1698: 1682: 1679: 1678: 1661: 1657: 1655: 1652: 1651: 1634: 1630: 1628: 1625: 1624: 1603: 1599: 1590: 1586: 1578: 1575: 1574: 1557: 1553: 1551: 1548: 1547: 1530: 1526: 1524: 1521: 1520: 1503: 1499: 1497: 1494: 1493: 1476: 1472: 1470: 1467: 1466: 1435: 1432: 1431: 1397: 1394: 1393: 1361: 1358: 1357: 1333: 1328: 1325: 1324: 1290: 1287: 1286: 1264: 1261: 1260: 1215:category theory 1211: 1200:, unique up to 1172: 1168: 1148: 1145: 1144: 1088: 1085: 1084: 1046: 1043: 1042: 1000: 997: 996: 968: 965: 964: 940: 935: 932: 931: 927:the set of all 894: 891: 890: 864: 861: 860: 840:, representing 775: 772: 771: 731: 728: 727: 689: 685: 675: 671: 638: 635: 634: 581: 580: 578: 575: 574: 553: 552: 550: 547: 546: 513: 512: 510: 507: 506: 480: 477: 476: 459: 455: 437: 433: 417: 413: 400: 398: 395: 394: 370: 366: 361: 353: 348: 343: 340: 339: 308: 305: 304: 270: 266: 264: 261: 260: 201: 196: 193: 192: 190:field extension 170:symmetric group 150: 142:category theory 91: 88: 87: 82:). If instead 74:to itself (the 17: 12: 11: 5: 3152: 3142: 3141: 3127: 3126: 3119: 3118:External links 3116: 3114: 3113: 3107: 3089: 3067: 3045: 3032: 3010: 2988: 2956: 2950: 2932: 2930: 2927: 2924: 2923: 2911: 2899: 2887: 2876:(2): 209โ€“216. 2860: 2848: 2835: 2834: 2832: 2829: 2826: 2825: 2808: 2777: 2774: 2751: 2747: 2740: 2737: 2712: 2685: 2684: 2682: 2679: 2678: 2677: 2675:Holonomy group 2672: 2666: 2659: 2656: 2640: 2637: 2634: 2631: 2628: 2588: 2585: 2582: 2579: 2576: 2573: 2570: 2567: 2564: 2544: 2541: 2538: 2535: 2532: 2529: 2526: 2502: 2499: 2496: 2493: 2490: 2487: 2478: 2457: 2454: 2451: 2448: 2445: 2442: 2433: 2412: 2409: 2406: 2403: 2400: 2397: 2394: 2348: 2345: 2342: 2339: 2336: 2312: 2309: 2306: 2303: 2294: 2269: 2266: 2263: 2260: 2257: 2233: 2230: 2227: 2224: 2221: 2201: 2198: 2195: 2192: 2183: 2162: 2159: 2156: 2153: 2150: 2130: 2127: 2124: 2121: 2112: 2088: 2085: 2082: 2066:Now, consider 2028: 2016: 2013: 2000: 1980: 1960: 1937: 1915: 1895: 1875: 1872: 1869: 1866: 1863: 1860: 1857: 1854: 1834: 1831: 1828: 1825: 1816:on the object 1797: 1794: 1791: 1788: 1785: 1750: 1745: 1741: 1737: 1734: 1731: 1728: 1725: 1720: 1716: 1712: 1709: 1706: 1686: 1664: 1660: 1637: 1633: 1606: 1602: 1598: 1593: 1589: 1585: 1582: 1560: 1556: 1533: 1529: 1506: 1502: 1479: 1475: 1451: 1448: 1445: 1442: 1439: 1419: 1416: 1413: 1410: 1407: 1404: 1401: 1377: 1374: 1371: 1368: 1365: 1345: 1340: 1337: 1332: 1312: 1309: 1306: 1303: 1300: 1297: 1294: 1274: 1271: 1268: 1210: 1207: 1206: 1205: 1189: 1186: 1183: 1180: 1175: 1171: 1167: 1164: 1161: 1158: 1155: 1152: 1120: 1104: 1101: 1098: 1095: 1092: 1068: 1065: 1062: 1059: 1056: 1053: 1050: 1033:from the left 1022: 1019: 1016: 1013: 1010: 1007: 1004: 984: 981: 978: 975: 972: 952: 947: 944: 939: 916: 913: 910: 907: 904: 901: 898: 874: 871: 868: 803: 800: 797: 794: 791: 788: 785: 782: 779: 759: 756: 753: 750: 747: 744: 741: 738: 735: 715: 712: 709: 706: 703: 700: 697: 692: 688: 683: 678: 674: 670: 667: 663: 660: 657: 654: 651: 648: 645: 642: 599: 598: 584: 556: 516: 500: 484: 462: 458: 454: 451: 448: 445: 440: 436: 431: 428: 425: 420: 416: 412: 407: 404: 373: 369: 364: 360: 356: 351: 347: 312: 301: 290: 287: 284: 281: 278: 273: 269: 239: 208: 204: 200: 176:. If the set 149: 146: 131:symmetry group 107: 104: 101: 98: 95: 35:consisting of 15: 9: 6: 4: 3: 2: 3151: 3140: 3137: 3136: 3134: 3125: 3122: 3121: 3110: 3108:9781461262176 3104: 3100: 3099: 3094: 3090: 3086: 3082: 3078: 3074: 3070: 3068:9780691081014 3064: 3060: 3056: 3055: 3050: 3046: 3043: 3039: 3035: 3029: 3025: 3021: 3020: 3015: 3011: 3007: 3003: 2999: 2995: 2991: 2985: 2981: 2977: 2973: 2969: 2965: 2961: 2957: 2953: 2947: 2943: 2939: 2934: 2933: 2920: 2915: 2908: 2903: 2896: 2891: 2883: 2879: 2875: 2871: 2864: 2857: 2852: 2845: 2840: 2836: 2822: 2806: 2798: 2794: 2775: 2772: 2749: 2745: 2738: 2735: 2700: 2696: 2690: 2686: 2676: 2673: 2670: 2667: 2665: 2662: 2661: 2655: 2652: 2635: 2629: 2626: 2618: 2614: 2610: 2606: 2602: 2601:group functor 2583: 2580: 2577: 2571: 2568: 2562: 2539: 2536: 2533: 2527: 2524: 2516: 2497: 2494: 2491: 2485: 2476: 2452: 2449: 2446: 2440: 2431: 2410: 2407: 2404: 2398: 2395: 2392: 2385:-linear maps 2384: 2380: 2376: 2373: 2368: 2366: 2362: 2343: 2337: 2334: 2326: 2307: 2301: 2292: 2283: 2264: 2258: 2255: 2247: 2228: 2222: 2219: 2196: 2190: 2181: 2157: 2151: 2148: 2125: 2119: 2110: 2102: 2086: 2080: 2073: 2069: 2064: 2062: 2058: 2054: 2050: 2046: 2042: 2026: 2012: 1998: 1978: 1958: 1950: 1913: 1893: 1867: 1861: 1858: 1852: 1829: 1823: 1815: 1811: 1795: 1789: 1786: 1783: 1775: 1771: 1767: 1762: 1743: 1739: 1732: 1729: 1718: 1714: 1707: 1704: 1684: 1662: 1658: 1635: 1631: 1622: 1604: 1600: 1591: 1587: 1583: 1580: 1558: 1554: 1531: 1527: 1504: 1500: 1477: 1473: 1463: 1446: 1440: 1437: 1414: 1411: 1408: 1402: 1399: 1391: 1372: 1366: 1363: 1343: 1338: 1330: 1307: 1304: 1301: 1295: 1292: 1272: 1269: 1266: 1257: 1255: 1251: 1247: 1243: 1239: 1235: 1231: 1227: 1223: 1218: 1216: 1203: 1184: 1178: 1173: 1169: 1159: 1153: 1150: 1143: 1139: 1136: 1132: 1129: 1125: 1121: 1118: 1099: 1093: 1090: 1082: 1063: 1060: 1057: 1051: 1048: 1040: 1036: 1017: 1014: 1011: 1005: 1002: 979: 973: 970: 950: 945: 937: 930: 911: 908: 905: 899: 896: 888: 872: 869: 866: 858: 857: 856: 853: 851: 847: 843: 839: 836:of the group 835: 834: 829: 825: 821: 817: 801: 795: 789: 786: 783: 780: 777: 754: 748: 745: 739: 736: 733: 713: 710: 707: 704: 698: 690: 686: 681: 676: 672: 665: 661: 655: 649: 646: 640: 632: 628: 624: 620: 616: 612: 608: 604: 572: 544: 540: 536: 532: 505: 501: 498: 497:abelian group 482: 460: 456: 452: 446: 438: 434: 429: 426: 423: 418: 414: 402: 392: 391: 371: 358: 354: 337: 333: 330: 326: 310: 302: 288: 282: 276: 271: 267: 259: 255: 252: 248: 246: 240: 237: 233: 229: 226: 222: 206: 202: 198: 191: 187: 186: 185: 183: 179: 175: 171: 167: 163: 159: 155: 145: 143: 138: 136: 132: 127: 125: 121: 102: 96: 93: 85: 81: 77: 73: 69: 65: 61: 58: 54: 50: 46: 42: 38: 37:automorphisms 34: 30: 27:of an object 26: 22: 3097: 3053: 3017: 2967: 2937: 2914: 2909:, Lemma 3.2. 2902: 2890: 2873: 2869: 2863: 2851: 2839: 2820: 2796: 2792: 2698: 2694: 2689: 2653: 2616: 2608: 2514: 2382: 2378: 2374: 2369: 2364: 2245: 2067: 2065: 2052: 2044: 2040: 2018: 1813: 1809: 1773: 1765: 1763: 1464: 1258: 1249: 1237: 1229: 1221: 1219: 1212: 1137: 1123: 1039:transitively 854: 845: 841: 837: 831: 827: 823: 819: 815: 630: 626: 622: 618: 610: 602: 600: 570: 542: 389: 331: 325:cyclic group 323:of a finite 253: 244: 236:Galois group 227: 220: 181: 177: 173: 165: 161: 153: 151: 139: 134: 128: 123: 83: 79: 71: 63: 60:vector space 52: 40: 28: 24: 18: 2964:Harris, Joe 2907:Milnor 1971 2701:is that of 2248:is chosen, 2072:linear maps 2061:Lie algebra 887:cardinality 633:determines 605:is a group 504:Lie algebra 243:projective 45:composition 21:mathematics 3085:0237.18005 2929:References 2693:First, if 2011:-modules. 1356:is a left 1242:unit group 929:bijections 336:isomorphic 3095:(2012) . 3006:246650103 2831:Citations 2776:~ 2739:~ 2630:⁡ 2581:⊗ 2572:⁡ 2566:↦ 2537:⊗ 2528:⁡ 2495:⊗ 2486:⁡ 2450:⊗ 2441:⁡ 2408:⊗ 2402:→ 2396:⊗ 2338:⁡ 2302:⁡ 2259:⁡ 2223:⁡ 2191:⁡ 2152:⁡ 2120:⁡ 2084:→ 1862:⁡ 1830:∗ 1793:→ 1733:⁡ 1727:→ 1708:⁡ 1597:→ 1573:, and if 1441:⁡ 1403:⁡ 1367:⁡ 1339:∼ 1336:→ 1296:⁡ 1234:morphisms 1179:⁡ 1166:↪ 1154:⁡ 1142:embedding 1094:⁡ 1052:⁡ 1006:⁡ 974:⁡ 946:∼ 943:→ 900:⁡ 790:φ 781:⋅ 749:⁡ 743:→ 734:φ 711:⋅ 687:σ 673:σ 669:↦ 650:⁡ 644:→ 609:on a set 531:Lie group 435:σ 424:∈ 415:σ 411:↦ 406:¯ 372:× 277:⁡ 97:⁡ 49:morphisms 3133:Category 3051:(1971). 3016:(1977), 2966:(1991). 2921:, ยง 7.6. 2658:See also 1770:category 1623:mapping 148:Examples 3077:0349811 3042:0463157 2998:1153249 2882:1990752 2611:to the 2049:algebra 1949:-object 1926:); cf. 1677:, then 1621:functor 1323:of all 1244:of the 1133:over a 963:. Then 256:is the 249:over a 31:is the 3105:  3083:  3075:  3065:  3040:  3030:  3004:  2996:  2986:  2948:  2880:  2762:where 1390:torsor 1226:object 1224:is an 1081:torsor 1035:freely 607:acting 541:). If 537:: see 495:is an 386:, the 247:-space 232:Galois 43:under 23:, the 2942:Wiley 2878:JSTOR 2681:Notes 2607:over 2599:is a 2513:over 2377:over 2363:over 2359:is a 2059:or a 2051:over 1951:. If 1619:is a 1236:from 1126:be a 1115:(cf. 1079:is a 830:is a 617:from 539:below 329:order 251:field 223:that 156:is a 70:from 55:is a 33:group 3103:ISBN 3063:ISBN 3028:ISBN 3002:OCLC 2984:ISBN 2946:ISBN 2555:and 2284:and 2019:Let 1546:and 1492:and 1254:PROP 1135:ring 1122:Let 1083:for 1037:and 889:and 859:Let 3081:Zbl 2976:doi 2627:Aut 2569:Aut 2525:Aut 2481:alg 2477:End 2436:alg 2432:End 2335:Aut 2297:alg 2293:End 2256:End 2220:Aut 2186:alg 2182:End 2149:End 2141:of 2115:alg 2111:End 1859:Obj 1730:Aut 1705:Aut 1650:to 1465:If 1438:Aut 1400:Iso 1364:Aut 1293:Iso 1259:If 1256:.) 1248:of 1220:If 1151:Aut 1091:Aut 1049:Iso 1003:Iso 971:Aut 897:Iso 826:on 746:Aut 647:Aut 601:If 338:to 334:is 327:of 268:PGL 225:fix 172:of 158:set 152:If 126:. 122:of 94:Aut 78:of 47:of 39:of 19:In 3135:: 3079:. 3073:MR 3071:. 3061:. 3038:MR 3036:, 3022:, 3000:. 2994:MR 2992:. 2982:. 2970:. 2962:; 2944:. 2874:72 2872:. 2651:. 2367:. 2063:. 1808:, 1217:. 1170:GL 1119:). 852:. 144:. 137:. 3111:. 3087:. 3008:. 2978:: 2954:. 2884:. 2821:C 2807:G 2797:G 2793:C 2773:G 2750:C 2746:/ 2736:G 2711:g 2699:G 2695:G 2639:) 2636:M 2633:( 2609:k 2587:) 2584:R 2578:M 2575:( 2563:R 2543:) 2540:R 2534:M 2531:( 2515:R 2501:) 2498:R 2492:M 2489:( 2456:) 2453:R 2447:M 2444:( 2411:R 2405:M 2399:R 2393:M 2383:R 2379:k 2375:R 2365:k 2347:) 2344:M 2341:( 2311:) 2308:M 2305:( 2268:) 2265:M 2262:( 2246:M 2232:) 2229:M 2226:( 2200:) 2197:M 2194:( 2161:) 2158:M 2155:( 2129:) 2126:M 2123:( 2087:M 2081:M 2070:- 2068:k 2053:k 2045:M 2041:k 2027:M 1999:G 1979:G 1959:C 1936:S 1914:G 1894:G 1874:) 1871:) 1868:G 1865:( 1856:( 1853:F 1833:) 1827:( 1824:F 1814:G 1810:C 1796:C 1790:G 1787:: 1784:F 1774:G 1766:G 1749:) 1744:2 1740:X 1736:( 1724:) 1719:1 1715:X 1711:( 1685:F 1663:2 1659:X 1636:1 1632:X 1605:2 1601:C 1592:1 1588:C 1584:: 1581:F 1559:2 1555:C 1532:1 1528:C 1505:2 1501:X 1478:1 1474:X 1450:) 1447:B 1444:( 1418:) 1415:B 1412:, 1409:A 1406:( 1388:- 1376:) 1373:B 1370:( 1344:B 1331:A 1311:) 1308:B 1305:, 1302:A 1299:( 1273:B 1270:, 1267:A 1250:X 1238:X 1230:X 1222:X 1204:. 1188:) 1185:R 1182:( 1174:n 1163:) 1160:P 1157:( 1138:R 1124:P 1103:) 1100:B 1097:( 1067:) 1064:B 1061:, 1058:A 1055:( 1021:) 1018:B 1015:, 1012:A 1009:( 983:) 980:B 977:( 951:B 938:A 915:) 912:B 909:, 906:A 903:( 873:B 870:, 867:A 846:X 842:G 838:G 828:X 824:G 820:X 816:X 802:x 799:) 796:g 793:( 787:= 784:x 778:g 758:) 755:X 752:( 740:G 737:: 714:x 708:g 705:= 702:) 699:x 696:( 691:g 682:, 677:g 666:g 662:, 659:) 656:X 653:( 641:G 631:X 627:G 623:X 619:G 611:X 603:G 597:. 583:g 571:G 555:g 543:G 515:g 499:. 483:G 461:a 457:x 453:= 450:) 447:x 444:( 439:a 430:, 427:G 419:a 403:a 390:n 368:) 363:Z 359:n 355:/ 350:Z 346:( 332:n 311:G 289:. 286:) 283:k 280:( 272:n 254:k 245:n 228:K 221:L 207:K 203:/ 199:L 182:X 178:X 174:X 166:X 162:X 154:X 124:X 106:) 103:X 100:( 84:X 80:X 72:X 64:X 53:X 41:X 29:X

Index

mathematics
group
automorphisms
composition
morphisms
finite-dimensional
vector space
linear transformations
general linear group
group automorphisms
symmetry group
category theory
set
symmetric group
field extension
fix
Galois
Galois group
projective n-space
field
projective linear group
cyclic group
order
isomorphic
multiplicative group of integers modulo n
abelian group
Lie algebra
Lie group
linear algebraic group
below

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