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Conjugate element (field theory)

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40: 431: 531: 316: 837:. There are quantitative forms of this, stating more precisely bounds (depending on degree) on the largest absolute value of a conjugate that imply that an algebraic integer is a root of unity. 288: 57: 448: 104: 76: 426:{\displaystyle {\sqrt{1}}={\begin{cases}1\\-{\frac {1}{2}}+{\frac {\sqrt {3}}{2}}i\\-{\frac {1}{2}}-{\frac {\sqrt {3}}{2}}i\end{cases}}} 83: 90: 72: 688: 180: 123: 17: 340: 61: 97: 889: 28: 546: 141: 271: 50: 27:
This article is about the conjugation between the roots of a polynomial. For other uses, see
8: 265: 865: 246: 176: 862: 814: 806: 153: 598: 569: 163: 826: 822: 291: 798:). The number of repeats in that list of each element is the separable degree 883: 834: 711:) by irreducibility of the minimal polynomial, and any isomorphism of fields 258: 661: 621: 526:{\displaystyle \left(x+{\frac {1}{2}}\right)^{2}+{\frac {3}{4}}=x^{2}+x+1.} 307: 257:. The equivalence of the two definitions is one of the starting points of 560:
is specified, one can take the conjugates in some relatively small field
137: 870: 39: 609:, then by definition it already contains such a splitting field. 733:
can be extended to an isomorphism of the splitting fields of
860: 419: 451: 319: 274: 224:
itself is included in the set of conjugates of 
218:in contexts where this is not ambiguous. Normally 64:. Unsourced material may be challenged and removed. 525: 425: 282: 881: 436:The latter two roots are conjugate elements in 552:, then the conjugates can be taken inside 276: 214:. Conjugate elements are commonly called 124:Learn how and when to remove this message 14: 882: 758:In summary, the conjugate elements of 268:, since the algebraic conjugates over 861: 73:"Conjugate element" field theory 62:adding citations to reliable sources 33: 846:David S. Dummit, Richard M. Foote, 762:are found, in any normal extension 691:on the conjugates. This follows as 564:. The smallest possible choice for 24: 25: 901: 854: 821:and all of its conjugates in the 683:is of this form: in other words, 253:that leave fixed the elements of 233:Equivalently, the conjugates of 38: 49:needs additional citations for 612:Given then a normal extension 294:are the number itself and its 13: 1: 840: 536: 306:The cube roots of the number 283:{\displaystyle \mathbb {R} } 264:The concept generalizes the 7: 675:. Conversely any conjugate 10: 906: 778:), as the set of elements 547:algebraically closed field 301: 26: 442:with minimal polynomial 850:, 3rd ed., Wiley, 2004. 656:will be a conjugate of 527: 427: 284: 722:that maps polynomial 528: 428: 285: 866:"Conjugate Elements" 449: 317: 272: 150:algebraic conjugates 58:improve this article 890:Field (mathematics) 545:is given inside an 266:complex conjugation 247:field automorphisms 863:Weisstein, Eric W. 622:automorphism group 589:, containing  523: 423: 418: 280: 239:are the images of 181:minimal polynomial 146:conjugate elements 815:algebraic integer 636:, and containing 496: 472: 411: 407: 396: 376: 372: 361: 330: 296:complex conjugate 154:algebraic element 134: 133: 126: 108: 16:(Redirected from 897: 876: 875: 848:Abstract algebra 829:at most 1, then 755:, respectively. 753: 746: 731: 720: 605:containing  599:normal extension 532: 530: 529: 524: 510: 509: 497: 489: 484: 483: 478: 474: 473: 465: 441: 432: 430: 429: 424: 422: 421: 412: 403: 402: 397: 389: 377: 368: 367: 362: 354: 331: 329: 321: 289: 287: 286: 281: 279: 256: 252: 244: 238: 229: 223: 213: 207: 201: 174: 161: 140:, in particular 129: 122: 118: 115: 109: 107: 66: 42: 34: 21: 18:Galois conjugate 905: 904: 900: 899: 898: 896: 895: 894: 880: 879: 857: 843: 823:complex numbers 809:states that if 801: 751: 744: 729: 718: 703:-isomorphic to 667:sends roots of 588: 570:splitting field 539: 505: 501: 488: 479: 464: 457: 453: 452: 450: 447: 446: 437: 417: 416: 401: 388: 382: 381: 366: 353: 347: 346: 336: 335: 325: 320: 318: 315: 314: 304: 275: 273: 270: 269: 254: 250: 240: 234: 225: 219: 209: 203: 195: 183: 166: 164:field extension 157: 130: 119: 113: 110: 67: 65: 55: 43: 32: 23: 22: 15: 12: 11: 5: 903: 893: 892: 878: 877: 856: 855:External links 853: 852: 851: 842: 839: 827:absolute value 799: 770:that contains 640:, any element 580: 538: 535: 534: 533: 522: 519: 516: 513: 508: 504: 500: 495: 492: 487: 482: 477: 471: 468: 463: 460: 456: 434: 433: 420: 415: 410: 406: 400: 395: 392: 387: 384: 383: 380: 375: 371: 365: 360: 357: 352: 349: 348: 345: 342: 341: 339: 334: 328: 324: 303: 300: 292:complex number 278: 187: 132: 131: 46: 44: 37: 9: 6: 4: 3: 2: 902: 891: 888: 887: 885: 873: 872: 867: 864: 859: 858: 849: 845: 844: 838: 836: 835:root of unity 832: 828: 824: 820: 816: 813:is a nonzero 812: 808: 805:A theorem of 803: 797: 793: 789: 785: 781: 777: 773: 769: 765: 761: 756: 754: 747: 740: 736: 732: 725: 721: 714: 710: 706: 702: 698: 694: 690: 686: 682: 678: 674: 670: 666: 663: 659: 655: 651: 647: 643: 639: 635: 631: 627: 623: 619: 615: 610: 608: 604: 600: 596: 592: 587: 583: 579: 575: 571: 568:is to take a 567: 563: 559: 556:. If no such 555: 551: 548: 544: 520: 517: 514: 511: 506: 502: 498: 493: 490: 485: 480: 475: 469: 466: 461: 458: 454: 445: 444: 443: 440: 413: 408: 404: 398: 393: 390: 385: 378: 373: 369: 363: 358: 355: 350: 343: 337: 332: 326: 322: 313: 312: 311: 309: 299: 297: 293: 267: 262: 260: 259:Galois theory 248: 243: 237: 231: 228: 222: 217: 212: 206: 199: 194: 190: 186: 182: 178: 173: 169: 165: 160: 155: 151: 147: 143: 139: 128: 125: 117: 114:December 2010 106: 103: 99: 96: 92: 89: 85: 82: 78: 75: –  74: 70: 69:Find sources: 63: 59: 53: 52: 47:This article 45: 41: 36: 35: 30: 19: 869: 847: 830: 818: 810: 804: 795: 791: 787: 783: 779: 775: 771: 767: 763: 759: 757: 749: 742: 738: 734: 727: 723: 716: 712: 708: 704: 700: 696: 692: 689:transitively 684: 680: 676: 672: 671:to roots of 668: 664: 662:automorphism 660:, since the 657: 653: 649: 645: 641: 637: 633: 629: 625: 617: 613: 611: 606: 602: 594: 590: 585: 581: 577: 573: 565: 561: 557: 553: 549: 542: 540: 438: 435: 305: 295: 263: 241: 235: 232: 226: 220: 215: 210: 204: 197: 192: 188: 184: 171: 167: 158: 149: 145: 142:field theory 135: 120: 111: 101: 94: 87: 80: 68: 56:Please help 51:verification 48: 138:mathematics 29:Conjugation 841:References 817:such that 537:Properties 245:under the 216:conjugates 175:, are the 84:newspapers 871:MathWorld 807:Kronecker 399:− 386:− 351:− 162:, over a 884:Category 790:in Aut( 620:, with 597:is any 302:Example 179:of the 98:scholar 786:) for 648:) for 156:  152:of an 144:, the 100:  93:  86:  79:  71:  833:is a 825:have 752:' 748:over 745:' 737:over 730:' 719:' 699:) is 687:acts 593:. If 572:over 310:are: 290:of a 208:over 177:roots 105:JSTOR 91:books 741:and 715:and 632:) = 624:Aut( 77:news 800:sep 766:of 726:to 679:of 652:in 616:of 601:of 576:of 541:If 308:one 249:of 202:of 148:or 136:In 60:by 886:: 868:. 802:. 521:1. 298:. 261:. 230:. 874:. 831:α 819:α 811:α 796:K 794:/ 792:L 788:g 784:α 782:( 780:g 776:α 774:( 772:K 768:K 764:L 760:α 750:F 743:p 739:F 735:p 728:p 724:p 717:F 713:F 709:β 707:( 705:K 701:K 697:α 695:( 693:K 685:G 681:α 677:β 673:p 669:p 665:g 658:α 654:G 650:g 646:α 644:( 642:g 638:α 634:G 630:K 628:/ 626:L 618:K 614:L 607:α 603:K 595:L 591:α 586:α 584:, 582:K 578:p 574:K 566:L 562:L 558:C 554:C 550:C 543:K 518:+ 515:x 512:+ 507:2 503:x 499:= 494:4 491:3 486:+ 481:2 476:) 470:2 467:1 462:+ 459:x 455:( 439:Q 414:i 409:2 405:3 394:2 391:1 379:i 374:2 370:3 364:+ 359:2 356:1 344:1 338:{ 333:= 327:3 323:1 277:R 255:K 251:L 242:α 236:α 227:α 221:α 211:K 205:α 200:) 198:x 196:( 193:α 191:, 189:K 185:p 172:K 170:/ 168:L 159:α 127:) 121:( 116:) 112:( 102:· 95:· 88:· 81:· 54:. 31:. 20:)

Index

Galois conjugate
Conjugation

verification
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adding citations to reliable sources
"Conjugate element" field theory
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mathematics
field theory
algebraic element
field extension
roots
minimal polynomial
field automorphisms
Galois theory
complex conjugation
complex number
one
algebraically closed field
splitting field
normal extension
automorphism group
automorphism
transitively

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