Knowledge (XXG)

Dempwolff group

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1060: 752: 677: 562: 466: 89: 402: 292: 139: 610: 326: 352: 232: 205: 166: 494: 496:
is not 3, 4, or 5, and in each of these three cases there is just one non-split extension. These three nonsplit extensions can be constructed as follows:
1101: 926: 693: 618: 503: 407: 30: 1094: 1059: 357: 247: 94: 1125: 775:
Rendiconti del Seminario Matematico della Università di Padova. The Mathematical Journal of the University of Padova
1087: 570: 755: 235: 1120: 297: 840: 1000: 864: 1019: 972: 940: 922: 891: 820: 782: 1071: 1009: 991: 964: 881: 873: 810: 331: 1031: 984: 936: 903: 832: 794: 210: 183: 144: 1027: 980: 932: 918: 910: 899: 828: 790: 565: 479: 1044: 770: 1114: 1014: 877: 1067: 803:
Australian Mathematical Society. Journal. Series A. Pure Mathematics and Statistics
680: 24: 469: 815: 1023: 976: 895: 824: 786: 27:
of order 319979520 = 2·3·5·7·31, that is the unique nonsplit extension
968: 944: 886: 354:. Note that this theorem does not necessarily apply to extensions of 238:(the full automorphism group of this lattice) as a maximal subgroup. 771:"On extensions of an elementary abelian group of order 2 by GL(5,2)" 801:
Dempwolff, Ulrich (1973), "On the second cohomology of GL(n,2)",
207:
as the subgroup fixing a certain lattice in the Lie algebra of
180:
that the Dempwolff group is contained in the compact Lie group
747:{\displaystyle 2^{5\,.}\mathrm {GL} _{5}(\mathbb {F} _{2})} 672:{\displaystyle 2^{4\,.}\mathrm {GL} _{4}(\mathbb {F} _{2})} 557:{\displaystyle 2^{3\,.}\mathrm {GL} _{3}(\mathbb {F} _{2})} 461:{\displaystyle 5^{3\,.}\mathrm {SL} _{n}(\mathbb {F} _{q})} 168:. The uniqueness of such a nonsplit extension was shown by 84:{\displaystyle 2^{5\,.}\mathrm {GL} _{5}(\mathbb {F} _{2})} 1075: 696: 621: 573: 506: 482: 410: 360: 334: 300: 250: 213: 186: 147: 97: 33: 951:
Smith, P. E. (1976), "A simple subgroup of M? and E
397:{\displaystyle \mathrm {SL} _{n}(\mathbb {F} _{q})} 287:{\displaystyle \mathrm {GL} _{n}(\mathbb {F} _{q})} 134:{\displaystyle \mathrm {GL} _{5}(\mathbb {F} _{2})} 746: 671: 604: 556: 488: 460: 396: 346: 320: 286: 226: 199: 160: 133: 83: 176:, who showed using some computer calculations of 957:The Bulletin of the London Mathematical Society 404:; for example, there is a non-split extension 1095: 8: 1102: 1088: 841:"On a subgroup of order 2 . ¦GL(5,2)¦ in E 1013: 885: 814: 735: 731: 730: 720: 712: 705: 701: 695: 660: 656: 655: 645: 637: 630: 626: 620: 593: 589: 588: 578: 572: 545: 541: 540: 530: 522: 515: 511: 505: 481: 473: 449: 445: 444: 434: 426: 419: 415: 409: 385: 381: 380: 370: 362: 359: 333: 312: 307: 303: 302: 299: 275: 271: 270: 260: 252: 249: 218: 212: 191: 185: 169: 152: 146: 122: 118: 117: 107: 99: 96: 72: 68: 67: 57: 49: 42: 38: 32: 19:In mathematical finite group theory, the 173: 605:{\displaystyle G_{2}(\mathbb {F} _{3})} 241: 679:is a maximal subgroup of the sporadic 244:, p.124) showed that any extension of 468:, which is a maximal subgroup of the 177: 7: 1056: 1054: 321:{\displaystyle \mathbb {F} _{q}^{n}} 845:(C), the Dempwolff group and Aut(D 1074:. You can help Knowledge (XXG) by 994:(1976), "A conjugacy theorem for E 716: 713: 641: 638: 526: 523: 430: 427: 366: 363: 256: 253: 103: 100: 53: 50: 14: 234:, and is also contained in the 1058: 917:(in German), Berlin, New York: 476:showed that it also splits if 141:by its natural module of order 754:is a maximal subgroup of the 741: 726: 666: 651: 599: 584: 551: 536: 455: 440: 391: 376: 281: 266: 128: 113: 78: 63: 1: 564:is a maximal subgroup of the 1015:10.1016/0021-8693(76)90235-0 878:10.1016/0021-8693(76)90097-1 1142: 1053: 839:Griess, Robert L. (1976), 769:Dempwolff, Ulrich (1972), 816:10.1017/S1446788700014221 1047:at the atlas of groups. 756:Thompson sporadic group 690:The nonsplit extension 615:The nonsplit extension 500:The nonsplit extension 236:Thompson sporadic group 172:, and the existence by 1070:-related article is a 748: 673: 606: 558: 490: 462: 398: 348: 347:{\displaystyle q>2} 322: 294:by its natural module 288: 228: 201: 162: 135: 85: 749: 674: 607: 559: 491: 463: 399: 349: 323: 289: 229: 227:{\displaystyle E_{8}} 202: 200:{\displaystyle E_{8}} 163: 161:{\displaystyle 2^{5}} 136: 86: 969:10.1112/blms/8.2.161 694: 619: 571: 504: 480: 408: 358: 332: 298: 248: 211: 184: 145: 95: 31: 317: 1126:Group theory stubs 1001:Journal of Algebra 865:Journal of Algebra 744: 669: 602: 554: 486: 458: 394: 344: 318: 301: 284: 224: 197: 158: 131: 81: 1083: 1082: 992:Thompson, John G. 928:978-3-540-03825-2 489:{\displaystyle n} 1133: 1104: 1097: 1090: 1062: 1055: 1034: 1017: 987: 947: 915:Endliche Gruppen 911:Huppert, Bertram 906: 889: 861: 835: 818: 797: 753: 751: 750: 745: 740: 739: 734: 725: 724: 719: 710: 709: 678: 676: 675: 670: 665: 664: 659: 650: 649: 644: 635: 634: 611: 609: 608: 603: 598: 597: 592: 583: 582: 563: 561: 560: 555: 550: 549: 544: 535: 534: 529: 520: 519: 495: 493: 492: 487: 474:Dempwolff (1973) 467: 465: 464: 459: 454: 453: 448: 439: 438: 433: 424: 423: 403: 401: 400: 395: 390: 389: 384: 375: 374: 369: 353: 351: 350: 345: 327: 325: 324: 319: 316: 311: 306: 293: 291: 290: 285: 280: 279: 274: 265: 264: 259: 233: 231: 230: 225: 223: 222: 206: 204: 203: 198: 196: 195: 170:Dempwolff (1972) 167: 165: 164: 159: 157: 156: 140: 138: 137: 132: 127: 126: 121: 112: 111: 106: 90: 88: 87: 82: 77: 76: 71: 62: 61: 56: 47: 46: 1141: 1140: 1136: 1135: 1134: 1132: 1131: 1130: 1111: 1110: 1109: 1108: 1051: 1045:Dempwolff group 1041: 997: 990: 954: 950: 929: 919:Springer-Verlag 909: 859: 856: 852: 848: 844: 838: 800: 768: 765: 729: 711: 697: 692: 691: 686: 654: 636: 622: 617: 616: 587: 574: 569: 568: 566:Chevalley group 539: 521: 507: 502: 501: 478: 477: 443: 425: 411: 406: 405: 379: 361: 356: 355: 330: 329: 296: 295: 269: 251: 246: 245: 214: 209: 208: 187: 182: 181: 174:Thompson (1976) 148: 143: 142: 116: 98: 93: 92: 66: 48: 34: 29: 28: 21:Dempwolff group 17: 12: 11: 5: 1139: 1137: 1129: 1128: 1123: 1113: 1112: 1107: 1106: 1099: 1092: 1084: 1081: 1080: 1063: 1049: 1048: 1040: 1039:External links 1037: 1036: 1035: 1008:(2): 525–530, 995: 988: 963:(2): 161–165, 952: 948: 927: 907: 872:(1): 271–279, 854: 850: 846: 842: 836: 798: 764: 761: 760: 759: 743: 738: 733: 728: 723: 718: 715: 708: 704: 700: 688: 684: 668: 663: 658: 653: 648: 643: 640: 633: 629: 625: 613: 601: 596: 591: 586: 581: 577: 553: 548: 543: 538: 533: 528: 525: 518: 514: 510: 485: 457: 452: 447: 442: 437: 432: 429: 422: 418: 414: 393: 388: 383: 378: 373: 368: 365: 343: 340: 337: 315: 310: 305: 283: 278: 273: 268: 263: 258: 255: 221: 217: 194: 190: 155: 151: 130: 125: 120: 115: 110: 105: 102: 80: 75: 70: 65: 60: 55: 52: 45: 41: 37: 15: 13: 10: 9: 6: 4: 3: 2: 1138: 1127: 1124: 1122: 1121:Finite groups 1119: 1118: 1116: 1105: 1100: 1098: 1093: 1091: 1086: 1085: 1079: 1077: 1073: 1069: 1064: 1061: 1057: 1052: 1046: 1043: 1042: 1038: 1033: 1029: 1025: 1021: 1016: 1011: 1007: 1003: 1002: 993: 989: 986: 982: 978: 974: 970: 966: 962: 958: 949: 946: 942: 938: 934: 930: 924: 920: 916: 912: 908: 905: 901: 897: 893: 888: 887:2027.42/21778 883: 879: 875: 871: 867: 866: 858: 837: 834: 830: 826: 822: 817: 812: 808: 804: 799: 796: 792: 788: 784: 780: 776: 772: 767: 766: 762: 757: 736: 721: 706: 702: 698: 689: 682: 661: 646: 631: 627: 623: 614: 594: 579: 575: 567: 546: 531: 516: 512: 508: 499: 498: 497: 483: 475: 471: 450: 435: 420: 416: 412: 386: 371: 341: 338: 335: 313: 308: 276: 261: 243: 242:Huppert (1967 239: 237: 219: 215: 192: 188: 179: 175: 171: 153: 149: 123: 108: 73: 58: 43: 39: 35: 26: 22: 1076:expanding it 1068:group theory 1065: 1050: 1005: 999: 960: 956: 914: 869: 863: 806: 802: 778: 774: 681:Conway group 240: 178:Smith (1976) 25:finite group 20: 18: 16:Finite group 809:: 207–209, 781:: 359–364, 470:Lyons group 1115:Categories 763:References 328:splits if 1024:0021-8693 977:0024-6093 896:0021-8693 825:0263-6115 787:0041-8994 758: Th. 913:(1967), 683: Co 1032:0399193 985:0409630 937:0224703 904:0407149 833:0357639 795:0393276 1030:  1022:  983:  975:  955:(3)", 945:527050 943:  935:  925:  902:  894:  831:  823:  793:  785:  1066:This 860:(PDF) 23:is a 1072:stub 1020:ISSN 973:ISSN 941:OCLC 923:ISBN 892:ISSN 821:ISSN 783:ISSN 339:> 1010:doi 998:", 965:doi 882:hdl 874:doi 811:doi 91:of 1117:: 1028:MR 1026:, 1018:, 1006:38 1004:, 981:MR 979:, 971:, 959:, 939:, 933:MR 931:, 921:, 900:MR 898:, 890:, 880:, 870:40 868:, 862:, 857:)" 853:°D 849:°D 829:MR 827:, 819:, 807:16 805:, 791:MR 789:, 779:48 777:, 773:, 472:. 1103:e 1096:t 1089:v 1078:. 1012:: 996:8 967:: 961:8 953:8 884:: 876:: 855:8 851:8 847:8 843:8 813:: 742:) 737:2 732:F 727:( 722:5 717:L 714:G 707:. 703:5 699:2 687:. 685:3 667:) 662:2 657:F 652:( 647:4 642:L 639:G 632:. 628:4 624:2 612:. 600:) 595:3 590:F 585:( 580:2 576:G 552:) 547:2 542:F 537:( 532:3 527:L 524:G 517:. 513:3 509:2 484:n 456:) 451:q 446:F 441:( 436:n 431:L 428:S 421:. 417:3 413:5 392:) 387:q 382:F 377:( 372:n 367:L 364:S 342:2 336:q 314:n 309:q 304:F 282:) 277:q 272:F 267:( 262:n 257:L 254:G 220:8 216:E 193:8 189:E 154:5 150:2 129:) 124:2 119:F 114:( 109:5 104:L 101:G 79:) 74:2 69:F 64:( 59:5 54:L 51:G 44:. 40:5 36:2

Index

finite group
Dempwolff (1972)
Thompson (1976)
Smith (1976)
Thompson sporadic group
Huppert (1967
Lyons group
Dempwolff (1973)
Chevalley group
Conway group
Thompson sporadic group
"On extensions of an elementary abelian group of order 2 by GL(5,2)"
ISSN
0041-8994
MR
0393276
doi
10.1017/S1446788700014221
ISSN
0263-6115
MR
0357639
"On a subgroup of order 2 . ¦GL(5,2)¦ in E8(C), the Dempwolff group and Aut(D8°D8°D8)"
Journal of Algebra
doi
10.1016/0021-8693(76)90097-1
hdl
2027.42/21778
ISSN
0021-8693

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