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Group homomorphism

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2405: 31: 2054: 108: 2400:{\displaystyle {\begin{aligned}&&h(g_{1})&=h(g_{2})\\\Leftrightarrow &&h(g_{1})\cdot h(g_{2})^{-1}&=e_{H}\\\Leftrightarrow &&h\left(g_{1}\circ g_{2}^{-1}\right)&=e_{H},\ \operatorname {ker} (h)=\{e_{G}\}\\\Rightarrow &&g_{1}\circ g_{2}^{-1}&=e_{G}\\\Leftrightarrow &&g_{1}&=g_{2}\end{aligned}}} 2002: 2576: 1762: 1596: 1496: 2667: 2878: 1728: 2059: 1767: 1160: 2482: 1997:{\displaystyle {\begin{aligned}h\left(g^{-1}\circ u\circ g\right)&=h(g)^{-1}\cdot h(u)\cdot h(g)\\&=h(g)^{-1}\cdot e_{H}\cdot h(g)\\&=h(g)^{-1}\cdot h(g)=e_{H},\end{aligned}}} 1668: 989: 2966: 2922: 3101: 3069: 3000: 1309:; they differ only in the notation of their elements (except of identity element) and are identical for all practical purposes. I.e. we re-label all elements except identity. 2750: 1084: 1188:
The purpose of defining a group homomorphism is to create functions that preserve the algebraic structure. An equivalent definition of group homomorphism is: The function
553: 528: 491: 1754: 855: 3040: 3020: 1514: 1416: 2606: 413: 3546: 3520: 3488: 2048:}. Injection directly gives that there is a unique element in the kernel, and, conversely, a unique element in the kernel gives injection: 1176:
sometimes means a map which respects not only the group structure (as above) but also the extra structure. For example, a homomorphism of
363: 2823: 848: 358: 1673: 774: 3538: 841: 1095: 2571:{\displaystyle G\equiv \left\{{\begin{pmatrix}a&b\\0&1\end{pmatrix}}{\bigg |}a>0,b\in \mathbf {R} \right\}} 458: 272: 1601:
The kernel and image of a homomorphism can be interpreted as measuring how close it is to being an isomorphism. The
1635: 656: 390: 267: 155: 3466:. The above compatibility also shows that the category of all abelian groups with group homomorphisms forms a 1369:, +) contains only two elements, the identity transformation and multiplication with βˆ’1; it is isomorphic to ( 3281:
The addition of homomorphisms is compatible with the composition of homomorphisms in the following sense: if
3470:; the existence of direct sums and well-behaved kernels makes this category the prototypical example of an 929: 2930: 2883: 1350: 897: 806: 596: 3604: 2675: 680: 3074: 3045: 2971: 3467: 3452: 3426: 2761: 1297:; i.e., injective and surjective. Its inverse is also a group homomorphism. In this case, the groups 620: 608: 226: 160: 2706: 1040: 3162:. This shows that the class of all groups, together with group homomorphisms as morphisms, forms a 1602: 1503: 1387: 1282: 873: 195: 90: 51: 536: 511: 474: 3609: 3167: 2464: 1270: 152: 2813:
that have homomorphisms from their additive group to their multiplicative group are thus called
2802: 3542: 3516: 3498: 3417: 2814: 1288: 1177: 751: 585: 428: 322: 2775:* with multiplication. The kernel is {0} and the image consists of the positive real numbers. 3560: 3471: 1398: 1391: 1010: 736: 728: 720: 712: 704: 692: 632: 572: 562: 404: 346: 221: 190: 63: 3556: 3564: 3552: 3163: 1625: 820: 813: 799: 756: 644: 567: 397: 311: 251: 131: 30: 1733: 1172:
In areas of mathematics where one considers groups endowed with additional structure, a
3580: 3412: 3025: 3005: 2779: 827: 763: 453: 433: 370: 335: 256: 246: 231: 216: 170: 147: 3598: 3493: 3187: 746: 668: 502: 375: 241: 1591:{\displaystyle \operatorname {im} (h):=h(G)\equiv \left\{h(u)\colon u\in G\right\}.} 3483: 2417: 1342: 1336: 1312: 1264: 601: 300: 289: 236: 211: 206: 165: 136: 99: 17: 1341:
A group endomorphism that is bijective, and hence an isomorphism. The set of all
3404: 2765: 1491:{\displaystyle \operatorname {ker} (h):=\left\{u\in G\colon h(u)=e_{H}\right\}.} 1276: 869: 3530: 2468: 768: 496: 3585: 3425:. For example, the endomorphism ring of the abelian group consisting of the 3104: 1294: 589: 27:
Mathematical function between groups that preserves multiplication structure
2662:{\displaystyle {\begin{pmatrix}a&b\\0&1\end{pmatrix}}\mapsto a^{u}} 107: 2008: 126: 2778:
The exponential map also yields a group homomorphism from the group of
1329:; the domain and codomain are the same. Also called an endomorphism of 468: 382: 994:
where the group operation on the left side of the equation is that of
3541:, vol. 211 (Revised third ed.), New York: Springer-Verlag, 2789:* with multiplication. This map is surjective and has the kernel {2Ο€ 2873:{\displaystyle \Phi :(\mathbb {N} ,+)\rightarrow (\mathbb {R} ,+)} 2581:
forms a group under matrix multiplication. For any complex number
75: 29: 2471:
and its kernel consists of all integers which are divisible by 3.
1723:{\displaystyle g^{-1}\circ u\circ g\in \operatorname {ker} (h)} 1089:
and it also maps inverses to inverses in the sense that
2785:
with addition to the group of non-zero complex numbers
2615: 2502: 1285:(or, onto); i.e., reaches every point in the codomain. 3077: 3048: 3028: 3008: 2974: 2933: 2886: 2826: 2709: 2609: 2485: 2057: 1765: 1736: 1676: 1638: 1517: 1419: 1098: 1043: 932: 539: 514: 477: 2771:
with addition to the group of non-zero real numbers
3411:) of all endomorphisms of an abelian group forms a 1247:in some sense has a similar algebraic structure as 3095: 3063: 3034: 3014: 2994: 2960: 2916: 2872: 2744: 2661: 2570: 2399: 1996: 1748: 1722: 1662: 1590: 1490: 1154: 1078: 983: 547: 522: 485: 3071:is the positive real numbers. Then, the function 2535: 2432:, +) = ({0, 1, 2}, +) and the group of integers ( 1155:{\displaystyle h\left(u^{-1}\right)=h(u)^{-1}.\,} 1605:states that the image of a group homomorphism, 1273:(or, one-to-one); i.e., preserves distinctness. 2764:yields a group homomorphism from the group of 1365:). As an example, the automorphism group of ( 849: 8: 2295: 2282: 1663:{\displaystyle u\in \operatorname {ker} (h)} 1169:"is compatible with the group structure". 856: 842: 294: 120: 85: 3190:(i.e., commutative) groups, then the set 3076: 3055: 3051: 3050: 3047: 3027: 3007: 2979: 2978: 2973: 2943: 2939: 2938: 2932: 2907: 2902: 2885: 2857: 2856: 2837: 2836: 2825: 2736: 2714: 2708: 2653: 2610: 2608: 2558: 2534: 2533: 2497: 2484: 2387: 2370: 2350: 2330: 2325: 2312: 2289: 2252: 2227: 2222: 2209: 2181: 2161: 2151: 2129: 2100: 2074: 2058: 2056: 2032:is injective (one-to-one) if and only if 1981: 1950: 1906: 1890: 1828: 1782: 1766: 1764: 1735: 1681: 1675: 1637: 1516: 1474: 1418: 1151: 1139: 1110: 1097: 1070: 1054: 1042: 931: 541: 540: 538: 516: 515: 513: 479: 478: 476: 1353:as operation, itself forms a group, the 1005:From this property, one can deduce that 3579:Rowland, Todd & Weisstein, Eric W. 3515:(3rd ed.). Wiley. pp. 71–72. 412: 178: 88: 1613:) is isomorphic to the quotient group 414:Classification of finite simple groups 1200:is a group homomorphism if whenever 984:{\displaystyle h(u*v)=h(u)\cdot h(v)} 7: 3489:Fundamental theorem on homomorphisms 3210:is itself an abelian group: the sum 3144:are group homomorphisms, then so is 2961:{\displaystyle (\mathbb {R} ^{+},*)} 2917:{\displaystyle \Phi (x)={\sqrt{2}}x} 1407:which are mapped to the identity in 1180:is often required to be continuous. 3220:of two homomorphisms is defined by 2674:Consider a multiplicative group of 34:Depiction of a group homomorphism ( 2887: 2827: 25: 3511:Dummit, D. S.; Foote, R. (2004). 2467:3 is a group homomorphism. It is 2023: 3202:of all group homomorphisms from 3096:{\displaystyle f:G\rightarrow H} 3064:{\displaystyle \mathbb {R} ^{+}} 2995:{\displaystyle (\mathbb {R} ,+)} 2559: 106: 3278:is again a group homomorphism. 3174:Homomorphisms of abelian groups 3407:, this shows that the set End( 3368:   and    3087: 3002:, represented respectively by 2989: 2975: 2955: 2934: 2896: 2890: 2867: 2853: 2850: 2847: 2833: 2745:{\displaystyle f_{u}(a)=a^{u}} 2726: 2720: 2646: 2360: 2302: 2276: 2270: 2191: 2158: 2144: 2135: 2122: 2113: 2106: 2093: 2080: 2067: 1971: 1965: 1947: 1940: 1924: 1918: 1887: 1880: 1864: 1858: 1849: 1843: 1825: 1818: 1717: 1711: 1657: 1651: 1565: 1559: 1545: 1539: 1530: 1524: 1464: 1458: 1432: 1426: 1136: 1129: 1079:{\displaystyle h(e_{G})=e_{H}} 1060: 1047: 998:and on the right side that of 978: 972: 963: 957: 948: 936: 775:Infinite dimensional Lie group 1: 3539:Graduate Texts in Mathematics 3444:is isomorphic to the ring of 1403:to be the set of elements in 1293:A group homomorphism that is 1281:A group homomorphism that is 1269:A group homomorphism that is 3252:)    for all 2682:, β‹…) for any complex number 548:{\displaystyle \mathbb {Z} } 523:{\displaystyle \mathbb {Z} } 486:{\displaystyle \mathbb {Z} } 273:List of group theory topics 3626: 1385: 1243:In other words, the group 3403:Since the composition is 1603:first isomorphism theorem 46:(right). The oval inside 3268:is needed to prove that 2927:Consider the two groups 2754:is a group homomorphism. 2671:is a group homomorphism. 1023:to the identity element 391:Elementary abelian group 268:Glossary of group theory 2801:}, as can be seen from 1361:. It is denoted by Aut( 1165:Hence one can say that 3097: 3065: 3036: 3016: 2996: 2962: 2918: 2874: 2746: 2663: 2572: 2401: 1998: 1750: 1724: 1664: 1592: 1492: 1351:functional composition 1317:A group homomorphism, 1215:  we have   1156: 1080: 985: 807:Linear algebraic group 549: 524: 487: 83: 3264:The commutativity of 3098: 3066: 3037: 3017: 2997: 2963: 2919: 2875: 2747: 2676:positive real numbers 2664: 2573: 2402: 1999: 1751: 1725: 1665: 1624:The kernel of h is a 1593: 1493: 1251:and the homomorphism 1157: 1081: 986: 550: 525: 488: 33: 3581:"Group Homomorphism" 3468:preadditive category 3075: 3046: 3026: 3006: 2972: 2931: 2884: 2824: 2707: 2686:. Then the function 2607: 2483: 2055: 2007:The image of h is a 1763: 1734: 1674: 1636: 1515: 1417: 1096: 1041: 930: 537: 512: 475: 2338: 2235: 1749:{\displaystyle u,g} 1388:Image (mathematics) 181:Group homomorphisms 91:Algebraic structure 18:Group homomorphisms 3168:category of groups 3166:(specifically the 3112:Category of groups 3107:is a homomorphism. 3105:logarithm function 3093: 3061: 3032: 3012: 2992: 2958: 2924:is a homomorphism. 2914: 2870: 2815:exponential fields 2742: 2659: 2640: 2568: 2527: 2397: 2395: 2321: 2218: 2025:group monomorphism 2018:The homomorphism, 1994: 1992: 1746: 1720: 1660: 1588: 1488: 1355:automorphism group 1178:topological groups 1152: 1076: 981: 911:such that for all 886:group homomorphism 657:Special orthogonal 545: 520: 483: 364:Lagrange's theorem 84: 3548:978-0-387-95385-4 3522:978-0-471-43334-7 3499:Ring homomorphism 3418:endomorphism ring 3035:{\displaystyle H} 3015:{\displaystyle G} 2909: 2263: 866: 865: 441: 440: 323:Alternating group 280: 279: 16:(Redirected from 3617: 3591: 3590: 3567: 3526: 3513:Abstract Algebra 3472:abelian category 3455:with entries in 3398: 3367: 3332: 3316: 3305:are elements of 3296: 3277: 3219: 3201: 3161: 3143: 3129: 3102: 3100: 3099: 3094: 3070: 3068: 3067: 3062: 3060: 3059: 3054: 3041: 3039: 3038: 3033: 3021: 3019: 3018: 3013: 3001: 2999: 2998: 2993: 2982: 2967: 2965: 2964: 2959: 2948: 2947: 2942: 2923: 2921: 2920: 2915: 2910: 2908: 2903: 2879: 2877: 2876: 2871: 2860: 2840: 2751: 2749: 2748: 2743: 2741: 2740: 2719: 2718: 2668: 2666: 2665: 2660: 2658: 2657: 2645: 2644: 2577: 2575: 2574: 2569: 2567: 2563: 2562: 2539: 2538: 2532: 2531: 2406: 2404: 2403: 2398: 2396: 2392: 2391: 2375: 2374: 2364: 2355: 2354: 2337: 2329: 2317: 2316: 2306: 2294: 2293: 2261: 2257: 2256: 2240: 2236: 2234: 2226: 2214: 2213: 2195: 2186: 2185: 2169: 2168: 2156: 2155: 2134: 2133: 2117: 2105: 2104: 2079: 2078: 2062: 2061: 2047: 2003: 2001: 2000: 1995: 1993: 1986: 1985: 1958: 1957: 1930: 1911: 1910: 1898: 1897: 1870: 1836: 1835: 1807: 1803: 1790: 1789: 1755: 1753: 1752: 1747: 1729: 1727: 1726: 1721: 1689: 1688: 1669: 1667: 1666: 1661: 1597: 1595: 1594: 1589: 1584: 1580: 1497: 1495: 1494: 1489: 1484: 1480: 1479: 1478: 1392:kernel (algebra) 1382:Image and kernel 1255:preserves that. 1161: 1159: 1158: 1153: 1147: 1146: 1122: 1118: 1117: 1085: 1083: 1082: 1077: 1075: 1074: 1059: 1058: 1011:identity element 990: 988: 987: 982: 858: 851: 844: 800:Algebraic groups 573:Hyperbolic group 563:Arithmetic group 554: 552: 551: 546: 544: 529: 527: 526: 521: 519: 492: 490: 489: 484: 482: 405:Schur multiplier 359:Cauchy's theorem 347:Quaternion group 295: 121: 110: 97: 86: 21: 3625: 3624: 3620: 3619: 3618: 3616: 3615: 3614: 3595: 3594: 3578: 3577: 3574: 3549: 3529: 3523: 3510: 3507: 3480: 3369: 3337: 3322: 3306: 3286: 3269: 3211: 3191: 3176: 3145: 3131: 3117: 3114: 3103:defined by the 3073: 3072: 3049: 3044: 3043: 3024: 3023: 3004: 3003: 2970: 2969: 2937: 2929: 2928: 2882: 2881: 2822: 2821: 2805:. Fields like 2803:Euler's formula 2780:complex numbers 2762:exponential map 2757: 2732: 2710: 2705: 2704: 2691: 2649: 2639: 2638: 2633: 2627: 2626: 2621: 2611: 2605: 2604: 2590: 2526: 2525: 2520: 2514: 2513: 2508: 2498: 2496: 2492: 2481: 2480: 2423: 2413: 2394: 2393: 2383: 2376: 2366: 2363: 2357: 2356: 2346: 2339: 2308: 2305: 2299: 2298: 2285: 2248: 2241: 2205: 2204: 2200: 2194: 2188: 2187: 2177: 2170: 2157: 2147: 2125: 2116: 2110: 2109: 2096: 2083: 2070: 2053: 2052: 2046: 2033: 1991: 1990: 1977: 1946: 1928: 1927: 1902: 1886: 1868: 1867: 1824: 1808: 1778: 1777: 1773: 1761: 1760: 1732: 1731: 1677: 1672: 1671: 1634: 1633: 1626:normal subgroup 1555: 1551: 1513: 1512: 1470: 1442: 1438: 1415: 1414: 1394: 1386:Main articles: 1384: 1261: 1186: 1135: 1106: 1102: 1094: 1093: 1066: 1050: 1039: 1038: 1028: 1017: 928: 927: 862: 833: 832: 821:Abelian variety 814:Reductive group 802: 792: 791: 790: 789: 740: 732: 724: 716: 708: 681:Special unitary 592: 578: 577: 559: 558: 535: 534: 510: 509: 473: 472: 464: 463: 454:Discrete groups 443: 442: 398:Frobenius group 343: 330: 319: 312:Symmetric group 308: 292: 282: 281: 132:Normal subgroup 118: 98: 89: 28: 23: 22: 15: 12: 11: 5: 3623: 3621: 3613: 3612: 3607: 3597: 3596: 3593: 3592: 3573: 3572:External links 3570: 3569: 3568: 3547: 3527: 3521: 3506: 3503: 3502: 3501: 3496: 3491: 3486: 3479: 3476: 3401: 3400: 3262: 3261: 3175: 3172: 3113: 3110: 3109: 3108: 3092: 3089: 3086: 3083: 3080: 3058: 3053: 3031: 3011: 2991: 2988: 2985: 2981: 2977: 2957: 2954: 2951: 2946: 2941: 2936: 2925: 2913: 2906: 2901: 2898: 2895: 2892: 2889: 2869: 2866: 2863: 2859: 2855: 2852: 2849: 2846: 2843: 2839: 2835: 2832: 2829: 2818: 2776: 2756: 2755: 2753: 2752: 2739: 2735: 2731: 2728: 2725: 2722: 2717: 2713: 2689: 2672: 2670: 2669: 2656: 2652: 2648: 2643: 2637: 2634: 2632: 2629: 2628: 2625: 2622: 2620: 2617: 2616: 2614: 2588: 2579: 2578: 2566: 2561: 2557: 2554: 2551: 2548: 2545: 2542: 2537: 2530: 2524: 2521: 2519: 2516: 2515: 2512: 2509: 2507: 2504: 2503: 2501: 2495: 2491: 2488: 2474: 2473: 2472: 2436:, +). The map 2421: 2412: 2409: 2408: 2407: 2390: 2386: 2382: 2379: 2377: 2373: 2369: 2365: 2362: 2359: 2358: 2353: 2349: 2345: 2342: 2340: 2336: 2333: 2328: 2324: 2320: 2315: 2311: 2307: 2304: 2301: 2300: 2297: 2292: 2288: 2284: 2281: 2278: 2275: 2272: 2269: 2266: 2260: 2255: 2251: 2247: 2244: 2242: 2239: 2233: 2230: 2225: 2221: 2217: 2212: 2208: 2203: 2199: 2196: 2193: 2190: 2189: 2184: 2180: 2176: 2173: 2171: 2167: 2164: 2160: 2154: 2150: 2146: 2143: 2140: 2137: 2132: 2128: 2124: 2121: 2118: 2115: 2112: 2111: 2108: 2103: 2099: 2095: 2092: 2089: 2086: 2084: 2082: 2077: 2073: 2069: 2066: 2063: 2060: 2042: 2005: 2004: 1989: 1984: 1980: 1976: 1973: 1970: 1967: 1964: 1961: 1956: 1953: 1949: 1945: 1942: 1939: 1936: 1933: 1931: 1929: 1926: 1923: 1920: 1917: 1914: 1909: 1905: 1901: 1896: 1893: 1889: 1885: 1882: 1879: 1876: 1873: 1871: 1869: 1866: 1863: 1860: 1857: 1854: 1851: 1848: 1845: 1842: 1839: 1834: 1831: 1827: 1823: 1820: 1817: 1814: 1811: 1809: 1806: 1802: 1799: 1796: 1793: 1788: 1785: 1781: 1776: 1772: 1769: 1768: 1745: 1742: 1739: 1730:for arbitrary 1719: 1716: 1713: 1710: 1707: 1704: 1701: 1698: 1695: 1692: 1687: 1684: 1680: 1659: 1656: 1653: 1650: 1647: 1644: 1641: 1599: 1598: 1587: 1583: 1579: 1576: 1573: 1570: 1567: 1564: 1561: 1558: 1554: 1550: 1547: 1544: 1541: 1538: 1535: 1532: 1529: 1526: 1523: 1520: 1499: 1498: 1487: 1483: 1477: 1473: 1469: 1466: 1463: 1460: 1457: 1454: 1451: 1448: 1445: 1441: 1437: 1434: 1431: 1428: 1425: 1422: 1396:We define the 1383: 1380: 1379: 1378: 1339: 1334: 1315: 1310: 1291: 1286: 1279: 1274: 1267: 1260: 1257: 1241: 1240: 1185: 1182: 1163: 1162: 1150: 1145: 1142: 1138: 1134: 1131: 1128: 1125: 1121: 1116: 1113: 1109: 1105: 1101: 1087: 1086: 1073: 1069: 1065: 1062: 1057: 1053: 1049: 1046: 1026: 1015: 992: 991: 980: 977: 974: 971: 968: 965: 962: 959: 956: 953: 950: 947: 944: 941: 938: 935: 923:it holds that 864: 863: 861: 860: 853: 846: 838: 835: 834: 831: 830: 828:Elliptic curve 824: 823: 817: 816: 810: 809: 803: 798: 797: 794: 793: 788: 787: 784: 781: 777: 773: 772: 771: 766: 764:Diffeomorphism 760: 759: 754: 749: 743: 742: 738: 734: 730: 726: 722: 718: 714: 710: 706: 701: 700: 689: 688: 677: 676: 665: 664: 653: 652: 641: 640: 629: 628: 621:Special linear 617: 616: 609:General linear 605: 604: 599: 593: 584: 583: 580: 579: 576: 575: 570: 565: 557: 556: 543: 531: 518: 505: 503:Modular groups 501: 500: 499: 494: 481: 465: 462: 461: 456: 450: 449: 448: 445: 444: 439: 438: 437: 436: 431: 426: 423: 417: 416: 410: 409: 408: 407: 401: 400: 394: 393: 388: 379: 378: 376:Hall's theorem 373: 371:Sylow theorems 367: 366: 361: 353: 352: 351: 350: 344: 339: 336:Dihedral group 332: 331: 326: 320: 315: 309: 304: 293: 288: 287: 284: 283: 278: 277: 276: 275: 270: 262: 261: 260: 259: 254: 249: 244: 239: 234: 229: 227:multiplicative 224: 219: 214: 209: 201: 200: 199: 198: 193: 185: 184: 176: 175: 174: 173: 171:Wreath product 168: 163: 158: 156:direct product 150: 148:Quotient group 142: 141: 140: 139: 134: 129: 119: 116: 115: 112: 111: 103: 102: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3622: 3611: 3608: 3606: 3603: 3602: 3600: 3588: 3587: 3582: 3576: 3575: 3571: 3566: 3562: 3558: 3554: 3550: 3544: 3540: 3536: 3532: 3528: 3524: 3518: 3514: 3509: 3508: 3504: 3500: 3497: 3495: 3494:Quasimorphism 3492: 3490: 3487: 3485: 3482: 3481: 3477: 3475: 3473: 3469: 3465: 3462: 3458: 3454: 3451: 3447: 3443: 3440: 3436: 3432: 3428: 3424: 3420: 3419: 3414: 3410: 3406: 3396: 3392: 3388: 3384: 3380: 3376: 3372: 3365: 3361: 3357: 3353: 3349: 3345: 3341: 3336: 3335: 3334: 3330: 3326: 3320: 3314: 3310: 3304: 3300: 3294: 3290: 3284: 3279: 3276: 3272: 3267: 3259: 3255: 3251: 3247: 3243: 3239: 3235: 3231: 3227: 3223: 3222: 3221: 3218: 3214: 3209: 3205: 3199: 3195: 3189: 3185: 3181: 3173: 3171: 3169: 3165: 3160: 3156: 3152: 3148: 3142: 3138: 3134: 3128: 3124: 3120: 3111: 3106: 3090: 3084: 3081: 3078: 3056: 3029: 3009: 2986: 2983: 2952: 2949: 2944: 2926: 2911: 2904: 2899: 2893: 2880:, defined by 2864: 2861: 2844: 2841: 2830: 2820:The function 2819: 2816: 2812: 2808: 2804: 2800: 2796: 2792: 2788: 2784: 2781: 2777: 2774: 2770: 2767: 2763: 2759: 2758: 2737: 2733: 2729: 2723: 2715: 2711: 2703: 2702: 2700: 2696: 2692: 2685: 2681: 2677: 2673: 2654: 2650: 2641: 2635: 2630: 2623: 2618: 2612: 2603: 2602: 2601: 2599: 2595: 2591: 2585:the function 2584: 2564: 2555: 2552: 2549: 2546: 2543: 2540: 2528: 2522: 2517: 2510: 2505: 2499: 2493: 2489: 2486: 2479: 2478: 2476: 2475: 2470: 2466: 2463: 2459: 2455: 2451: 2447: 2443: 2439: 2435: 2431: 2427: 2419: 2416:Consider the 2415: 2414: 2410: 2388: 2384: 2380: 2378: 2371: 2367: 2351: 2347: 2343: 2341: 2334: 2331: 2326: 2322: 2318: 2313: 2309: 2290: 2286: 2279: 2273: 2267: 2264: 2258: 2253: 2249: 2245: 2243: 2237: 2231: 2228: 2223: 2219: 2215: 2210: 2206: 2201: 2197: 2182: 2178: 2174: 2172: 2165: 2162: 2152: 2148: 2141: 2138: 2130: 2126: 2119: 2101: 2097: 2090: 2087: 2085: 2075: 2071: 2064: 2051: 2050: 2049: 2045: 2041: 2037: 2031: 2027: 2026: 2021: 2016: 2014: 2010: 1987: 1982: 1978: 1974: 1968: 1962: 1959: 1954: 1951: 1943: 1937: 1934: 1932: 1921: 1915: 1912: 1907: 1903: 1899: 1894: 1891: 1883: 1877: 1874: 1872: 1861: 1855: 1852: 1846: 1840: 1837: 1832: 1829: 1821: 1815: 1812: 1810: 1804: 1800: 1797: 1794: 1791: 1786: 1783: 1779: 1774: 1770: 1759: 1758: 1757: 1743: 1740: 1737: 1714: 1708: 1705: 1702: 1699: 1696: 1693: 1690: 1685: 1682: 1678: 1654: 1648: 1645: 1642: 1639: 1631: 1627: 1622: 1620: 1616: 1612: 1608: 1604: 1585: 1581: 1577: 1574: 1571: 1568: 1562: 1556: 1552: 1548: 1542: 1536: 1533: 1527: 1521: 1518: 1511: 1510: 1509: 1507: 1505: 1485: 1481: 1475: 1471: 1467: 1461: 1455: 1452: 1449: 1446: 1443: 1439: 1435: 1429: 1423: 1420: 1413: 1412: 1411: 1410: 1406: 1402: 1400: 1393: 1389: 1381: 1376: 1372: 1368: 1364: 1360: 1356: 1352: 1348: 1344: 1343:automorphisms 1340: 1338: 1335: 1332: 1328: 1324: 1320: 1316: 1314: 1311: 1308: 1304: 1300: 1296: 1292: 1290: 1287: 1284: 1280: 1278: 1275: 1272: 1268: 1266: 1263: 1262: 1258: 1256: 1254: 1250: 1246: 1238: 1234: 1230: 1226: 1222: 1218: 1214: 1210: 1206: 1203: 1202: 1201: 1199: 1195: 1191: 1183: 1181: 1179: 1175: 1170: 1168: 1148: 1143: 1140: 1132: 1126: 1123: 1119: 1114: 1111: 1107: 1103: 1099: 1092: 1091: 1090: 1071: 1067: 1063: 1055: 1051: 1044: 1037: 1036: 1035: 1033: 1029: 1022: 1018: 1012: 1008: 1003: 1001: 997: 975: 969: 966: 960: 954: 951: 945: 942: 939: 933: 926: 925: 924: 922: 918: 914: 910: 906: 902: 899: 895: 891: 887: 883: 879: 875: 871: 859: 854: 852: 847: 845: 840: 839: 837: 836: 829: 826: 825: 822: 819: 818: 815: 812: 811: 808: 805: 804: 801: 796: 795: 785: 782: 779: 778: 776: 770: 767: 765: 762: 761: 758: 755: 753: 750: 748: 745: 744: 741: 735: 733: 727: 725: 719: 717: 711: 709: 703: 702: 698: 694: 691: 690: 686: 682: 679: 678: 674: 670: 667: 666: 662: 658: 655: 654: 650: 646: 643: 642: 638: 634: 631: 630: 626: 622: 619: 618: 614: 610: 607: 606: 603: 600: 598: 595: 594: 591: 587: 582: 581: 574: 571: 569: 566: 564: 561: 560: 532: 507: 506: 504: 498: 495: 470: 467: 466: 460: 457: 455: 452: 451: 447: 446: 435: 432: 430: 427: 424: 421: 420: 419: 418: 415: 411: 406: 403: 402: 399: 396: 395: 392: 389: 387: 385: 381: 380: 377: 374: 372: 369: 368: 365: 362: 360: 357: 356: 355: 354: 348: 345: 342: 337: 334: 333: 329: 324: 321: 318: 313: 310: 307: 302: 299: 298: 297: 296: 291: 290:Finite groups 286: 285: 274: 271: 269: 266: 265: 264: 263: 258: 255: 253: 250: 248: 245: 243: 240: 238: 235: 233: 230: 228: 225: 223: 220: 218: 215: 213: 210: 208: 205: 204: 203: 202: 197: 194: 192: 189: 188: 187: 186: 183: 182: 177: 172: 169: 167: 164: 162: 159: 157: 154: 151: 149: 146: 145: 144: 143: 138: 135: 133: 130: 128: 125: 124: 123: 122: 117:Basic notions 114: 113: 109: 105: 104: 101: 96: 92: 87: 81: 77: 73: 69: 65: 61: 57: 53: 49: 45: 41: 37: 32: 19: 3605:Group theory 3584: 3534: 3512: 3484:Homomorphism 3463: 3460: 3456: 3449: 3445: 3441: 3438: 3434: 3430: 3422: 3416: 3408: 3402: 3394: 3390: 3386: 3382: 3378: 3374: 3370: 3363: 3359: 3355: 3351: 3347: 3343: 3339: 3328: 3324: 3318: 3312: 3308: 3302: 3298: 3292: 3288: 3282: 3280: 3274: 3270: 3265: 3263: 3257: 3253: 3249: 3245: 3241: 3237: 3233: 3229: 3225: 3216: 3212: 3207: 3203: 3197: 3193: 3183: 3179: 3177: 3158: 3154: 3150: 3146: 3140: 3136: 3132: 3126: 3122: 3118: 3115: 2810: 2806: 2798: 2794: 2790: 2786: 2782: 2772: 2768: 2766:real numbers 2698: 2694: 2687: 2683: 2679: 2597: 2593: 2586: 2582: 2580: 2461: 2457: 2453: 2449: 2445: 2441: 2437: 2433: 2429: 2425: 2418:cyclic group 2043: 2039: 2035: 2029: 2024: 2019: 2017: 2012: 2006: 1629: 1623: 1618: 1614: 1610: 1606: 1600: 1502: 1500: 1408: 1404: 1397: 1395: 1374: 1370: 1366: 1362: 1358: 1354: 1346: 1337:Automorphism 1330: 1326: 1322: 1318: 1313:Endomorphism 1306: 1302: 1298: 1265:Monomorphism 1252: 1248: 1244: 1242: 1236: 1232: 1228: 1224: 1220: 1216: 1212: 1208: 1204: 1197: 1193: 1189: 1187: 1174:homomorphism 1173: 1171: 1166: 1164: 1088: 1031: 1024: 1020: 1013: 1006: 1004: 999: 995: 993: 920: 916: 912: 908: 904: 900: 893: 889: 885: 881: 877: 872:, given two 867: 696: 684: 672: 660: 648: 636: 624: 612: 383: 340: 327: 316: 305: 301:Cyclic group 180: 179: 166:Free product 137:Group action 100:Group theory 95:Group theory 94: 79: 71: 67: 59: 55: 47: 43: 39: 35: 3531:Lang, Serge 3405:associative 2701:defined by 2600:defined by 1345:of a group 1305:are called 1289:Isomorphism 1277:Epimorphism 870:mathematics 586:Topological 425:alternating 3599:Categories 3565:0984.00001 3505:References 3433:copies of 3427:direct sum 2469:surjective 1307:isomorphic 1283:surjective 896:, Β·) is a 693:Symplectic 633:Orthogonal 590:Lie groups 497:Free group 222:continuous 161:Direct sum 42:(left) to 3610:Morphisms 3586:MathWorld 3088:→ 2953:∗ 2888:Φ 2851:→ 2828:Φ 2647:↦ 2556:∈ 2490:≡ 2361:⇔ 2332:− 2319:∘ 2303:⇒ 2268:⁡ 2229:− 2216:∘ 2192:⇔ 2163:− 2139:⋅ 2114:⇔ 1960:⋅ 1952:− 1913:⋅ 1900:⋅ 1892:− 1853:⋅ 1838:⋅ 1830:− 1798:∘ 1792:∘ 1784:− 1709:⁡ 1703:∈ 1697:∘ 1691:∘ 1683:− 1670:and show 1649:⁡ 1643:∈ 1632:. Assume 1575:∈ 1569:: 1549:≡ 1522:⁡ 1453:: 1447:∈ 1424:⁡ 1295:bijective 1271:injective 1184:Intuition 1141:− 1112:− 1009:maps the 967:⋅ 943:∗ 880:,βˆ—) and ( 757:Conformal 645:Euclidean 252:nilpotent 3533:(2002), 3478:See also 3453:matrices 3333:, then 3164:category 3153: : 3135: : 3121: : 3042:, where 2793: : 2693: : 2592: : 2477:The set 2440: : 2411:Examples 2028:; i.e., 2009:subgroup 1501:and the 1192: : 903: : 898:function 892:,βˆ—) to ( 884:, Β·), a 752:PoincarΓ© 597:Solenoid 469:Integers 459:Lattices 434:sporadic 429:Lie type 257:solvable 247:dihedral 232:additive 217:infinite 127:Subgroup 3557:1878556 3535:Algebra 3188:abelian 2022:, is a 1349:, with 747:Lorentz 669:Unitary 568:Lattice 508:PSL(2, 242:abelian 153:(Semi-) 62:is the 50:is the 38:) from 3563:  3555:  3545:  3519:  3415:, the 3381:) = ( 3321:is in 3317:, and 3285:is in 2262:  1508:to be 1399:kernel 888:from ( 874:groups 602:Circle 533:SL(2, 422:cyclic 386:-group 237:cyclic 212:finite 207:simple 191:kernel 64:kernel 3389:) + ( 3358:) + ( 2452:with 2038:) = { 1617:/ker 1504:image 1377:, +). 1259:Types 786:Sp(∞) 783:SU(∞) 196:image 76:coset 74:is a 52:image 3543:ISBN 3517:ISBN 3448:-by- 3413:ring 3350:= ( 3346:) ∘ 3323:Hom( 3307:Hom( 3287:Hom( 3244:) + 3236:) = 3192:Hom( 3186:are 3182:and 3130:and 3022:and 2968:and 2809:and 2760:The 2544:> 2460:) = 2034:ker( 1506:of h 1401:of h 1390:and 1301:and 1231:) = 1223:) β‹… 915:and 780:O(∞) 769:Loop 588:and 70:and 3561:Zbl 3429:of 3421:of 3373:∘ ( 3256:in 3206:to 3178:If 3170:). 3116:If 2465:mod 2424:= ( 2265:ker 2011:of 1706:ker 1646:ker 1628:of 1421:ker 1357:of 1030:of 1019:of 919:in 876:, ( 868:In 695:Sp( 683:SU( 659:SO( 623:SL( 611:GL( 78:of 66:of 54:of 3601:: 3583:. 3559:, 3553:MR 3551:, 3537:, 3474:. 3393:∘ 3385:∘ 3377:+ 3362:∘ 3354:∘ 3342:+ 3327:, 3311:, 3301:, 3297:, 3291:, 3273:+ 3232:)( 3228:+ 3215:+ 3196:, 3157:β†’ 3149:∘ 3139:β†’ 3125:β†’ 2797:∈ 2791:ki 2697:β†’ 2596:β†’ 2448:/3 2444:β†’ 2428:/3 2015:. 1756:: 1621:. 1534::= 1519:im 1436::= 1373:/2 1325:β†’ 1321:: 1239:). 1211:= 1207:βˆ— 1196:β†’ 1034:, 1002:. 907:β†’ 671:U( 647:E( 635:O( 93:β†’ 72:aN 58:. 3589:. 3525:. 3464:Z 3461:n 3459:/ 3457:Z 3450:m 3446:m 3442:Z 3439:n 3437:/ 3435:Z 3431:m 3423:G 3409:G 3399:. 3397:) 3395:k 3391:g 3387:h 3383:g 3379:k 3375:h 3371:g 3366:) 3364:f 3360:k 3356:f 3352:h 3348:f 3344:k 3340:h 3338:( 3331:) 3329:L 3325:H 3319:g 3315:) 3313:H 3309:G 3303:k 3299:h 3295:) 3293:G 3289:K 3283:f 3275:k 3271:h 3266:H 3260:. 3258:G 3254:u 3250:u 3248:( 3246:k 3242:u 3240:( 3238:h 3234:u 3230:k 3226:h 3224:( 3217:k 3213:h 3208:H 3204:G 3200:) 3198:H 3194:G 3184:H 3180:G 3159:K 3155:G 3151:h 3147:k 3141:K 3137:H 3133:k 3127:H 3123:G 3119:h 3091:H 3085:G 3082:: 3079:f 3057:+ 3052:R 3030:H 3010:G 2990:) 2987:+ 2984:, 2980:R 2976:( 2956:) 2950:, 2945:+ 2940:R 2935:( 2912:x 2905:2 2900:= 2897:) 2894:x 2891:( 2868:) 2865:+ 2862:, 2858:R 2854:( 2848:) 2845:+ 2842:, 2838:N 2834:( 2831:: 2817:. 2811:C 2807:R 2799:Z 2795:k 2787:C 2783:C 2773:R 2769:R 2738:u 2734:a 2730:= 2727:) 2724:a 2721:( 2716:u 2712:f 2699:C 2695:R 2690:u 2688:f 2684:u 2680:R 2678:( 2655:u 2651:a 2642:) 2636:1 2631:0 2624:b 2619:a 2613:( 2598:C 2594:G 2589:u 2587:f 2583:u 2565:} 2560:R 2553:b 2550:, 2547:0 2541:a 2536:| 2529:) 2523:1 2518:0 2511:b 2506:a 2500:( 2494:{ 2487:G 2462:u 2458:u 2456:( 2454:h 2450:Z 2446:Z 2442:Z 2438:h 2434:Z 2430:Z 2426:Z 2422:3 2420:Z 2389:2 2385:g 2381:= 2372:1 2368:g 2352:G 2348:e 2344:= 2335:1 2327:2 2323:g 2314:1 2310:g 2296:} 2291:G 2287:e 2283:{ 2280:= 2277:) 2274:h 2271:( 2259:, 2254:H 2250:e 2246:= 2238:) 2232:1 2224:2 2220:g 2211:1 2207:g 2202:( 2198:h 2183:H 2179:e 2175:= 2166:1 2159:) 2153:2 2149:g 2145:( 2142:h 2136:) 2131:1 2127:g 2123:( 2120:h 2107:) 2102:2 2098:g 2094:( 2091:h 2088:= 2081:) 2076:1 2072:g 2068:( 2065:h 2044:G 2040:e 2036:h 2030:h 2020:h 2013:H 1988:, 1983:H 1979:e 1975:= 1972:) 1969:g 1966:( 1963:h 1955:1 1948:) 1944:g 1941:( 1938:h 1935:= 1925:) 1922:g 1919:( 1916:h 1908:H 1904:e 1895:1 1888:) 1884:g 1881:( 1878:h 1875:= 1865:) 1862:g 1859:( 1856:h 1850:) 1847:u 1844:( 1841:h 1833:1 1826:) 1822:g 1819:( 1816:h 1813:= 1805:) 1801:g 1795:u 1787:1 1780:g 1775:( 1771:h 1744:g 1741:, 1738:u 1718:) 1715:h 1712:( 1700:g 1694:u 1686:1 1679:g 1658:) 1655:h 1652:( 1640:u 1630:G 1619:h 1615:G 1611:G 1609:( 1607:h 1586:. 1582:} 1578:G 1572:u 1566:) 1563:u 1560:( 1557:h 1553:{ 1546:) 1543:G 1540:( 1537:h 1531:) 1528:h 1525:( 1486:. 1482:} 1476:H 1472:e 1468:= 1465:) 1462:u 1459:( 1456:h 1450:G 1444:u 1440:{ 1433:) 1430:h 1427:( 1409:H 1405:G 1375:Z 1371:Z 1367:Z 1363:G 1359:G 1347:G 1333:. 1331:G 1327:G 1323:G 1319:h 1303:H 1299:G 1253:h 1249:G 1245:H 1237:c 1235:( 1233:h 1229:b 1227:( 1225:h 1221:a 1219:( 1217:h 1213:c 1209:b 1205:a 1198:H 1194:G 1190:h 1167:h 1149:. 1144:1 1137:) 1133:u 1130:( 1127:h 1124:= 1120:) 1115:1 1108:u 1104:( 1100:h 1072:H 1068:e 1064:= 1061:) 1056:G 1052:e 1048:( 1045:h 1032:H 1027:H 1025:e 1021:G 1016:G 1014:e 1007:h 1000:H 996:G 979:) 976:v 973:( 970:h 964:) 961:u 958:( 955:h 952:= 949:) 946:v 940:u 937:( 934:h 921:G 917:v 913:u 909:H 905:G 901:h 894:H 890:G 882:H 878:G 857:e 850:t 843:v 739:8 737:E 731:7 729:E 723:6 721:E 715:4 713:F 707:2 705:G 699:) 697:n 687:) 685:n 675:) 673:n 663:) 661:n 651:) 649:n 639:) 637:n 627:) 625:n 615:) 613:n 555:) 542:Z 530:) 517:Z 493:) 480:Z 471:( 384:p 349:Q 341:n 338:D 328:n 325:A 317:n 314:S 306:n 303:Z 82:. 80:N 68:h 60:N 56:h 48:H 44:H 40:G 36:h 20:)

Index

Group homomorphisms

image
kernel
coset
Algebraic structure
Group theory

Subgroup
Normal subgroup
Group action
Quotient group
(Semi-)
direct product
Direct sum
Free product
Wreath product
Group homomorphisms
kernel
image
simple
finite
infinite
continuous
multiplicative
additive
cyclic
abelian
dihedral
nilpotent

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