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Minkowski's bound

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536: 300: 386: 139: 90: 198: 170: 742: 531:{\displaystyle {\sqrt {|D|}}\geq \left({\frac {\pi }{4}}\right)^{r_{2}}{\frac {n^{n}}{n!}}\geq \left({\frac {\pi }{4}}\right)^{n/2}{\frac {n^{n}}{n!}}\ .} 59: 329:
Since the number of integral ideals of given norm is finite, the finiteness of the class number is an immediate consequence, and further, the
679: 644: 610: 636: 747: 671: 20: 566: 554: 95: 704: 73: 726: 295:{\displaystyle M_{K}={\sqrt {|D|}}\left({\frac {4}{\pi }}\right)^{r_{2}}{\frac {n!}{n^{n}}}\ .} 675: 640: 606: 330: 177: 142: 43: 32: 685: 650: 616: 148: 689: 663: 654: 620: 602: 185: 173: 349:
Minkowski's bound may be used to derive a lower bound for the discriminant of a field
736: 718: 545:
at least 2, it is easy to show that the lower bound is greater than 1, so we obtain
16:
Limits ideals to be checked in order to determine the class number of a number field
36: 334: 28: 709: 628: 189: 553:, is non-trivial. This implies that the field of rational numbers has no 670:. Encyclopedia of Mathematics and its Applications. Vol. 30. 601:. Encycl. Math. Sci. Vol. 62 (2nd printing of 1st ed.). 371:. Since an integral ideal has norm at least one, we have 1 ≤ 31:
of the norm of ideals to be checked in order to determine the
549:, that the discriminant of every number field, other than 639:. Vol. 110 (second ed.). New York: Springer. 389: 201: 151: 98: 76: 705:"Using Minkowski's Constant To Find A Class Number" 530: 294: 164: 133: 84: 8: 506: 500: 490: 486: 472: 448: 442: 434: 429: 415: 400: 392: 390: 388: 278: 264: 256: 251: 237: 225: 217: 215: 206: 200: 156: 150: 125: 106: 97: 78: 77: 75: 584: 582: 578: 7: 42:. It is named for the mathematician 743:Theorems in algebraic number theory 668:Algorithmic Algebraic Number Theory 588:Pohst & Zassenhaus (1989) p.384 14: 192:not exceeding Minkowski's bound 565:The result is a consequence of 401: 393: 226: 218: 134:{\displaystyle 2r_{2}=n-r_{1}} 1: 637:Graduate Texts in Mathematics 85:{\displaystyle \mathbb {Q} } 764: 729:at Secret Blogging Seminar 672:Cambridge University Press 176:. Then every class in the 633:Algebraic Number Theory 599:Algebraic Number Theory 21:algebraic number theory 532: 296: 166: 135: 86: 597:Koch, Helmut (1997). 533: 297: 167: 165:{\displaystyle r_{1}} 136: 87: 717:Stevenhagen, Peter. 555:unramified extension 387: 333:is generated by the 306:Minkowski's constant 199: 149: 96: 74: 727:The Minkowski Bound 567:Minkowski's theorem 547:Minkowski's Theorem 528: 292: 162: 143:complex embeddings 131: 82: 748:Hermann Minkowski 524: 520: 480: 462: 423: 405: 331:ideal class group 288: 284: 245: 230: 178:ideal class group 172:is the number of 141:be the number of 66:be the degree of 44:Hermann Minkowski 25:Minkowski's bound 755: 714: 693: 658: 624: 589: 586: 537: 535: 534: 529: 522: 521: 519: 511: 510: 501: 499: 498: 494: 485: 481: 473: 463: 461: 453: 452: 443: 441: 440: 439: 438: 428: 424: 416: 406: 404: 396: 391: 337:of norm at most 301: 299: 298: 293: 286: 285: 283: 282: 273: 265: 263: 262: 261: 260: 250: 246: 238: 231: 229: 221: 216: 211: 210: 171: 169: 168: 163: 161: 160: 140: 138: 137: 132: 130: 129: 111: 110: 91: 89: 88: 83: 81: 763: 762: 758: 757: 756: 754: 753: 752: 733: 732: 703: 700: 682: 661: 647: 627: 613: 603:Springer-Verlag 596: 593: 592: 587: 580: 575: 563: 512: 502: 468: 467: 454: 444: 430: 411: 410: 385: 384: 379: 370: 363: 345: 327: 320: 274: 266: 252: 233: 232: 202: 197: 196: 174:real embeddings 152: 147: 146: 121: 102: 94: 93: 72: 71: 52: 17: 12: 11: 5: 761: 759: 751: 750: 745: 735: 734: 731: 730: 724: 715: 699: 698:External links 696: 695: 694: 680: 664:Zassenhaus, H. 659: 645: 625: 611: 591: 590: 577: 576: 574: 571: 562: 559: 539: 538: 527: 518: 515: 509: 505: 497: 493: 489: 484: 479: 476: 471: 466: 460: 457: 451: 447: 437: 433: 427: 422: 419: 414: 409: 403: 399: 395: 375: 368: 361: 341: 326: 323: 316: 312:is this bound 308:for the field 303: 302: 291: 281: 277: 272: 269: 259: 255: 249: 244: 241: 236: 228: 224: 220: 214: 209: 205: 186:integral ideal 159: 155: 128: 124: 120: 117: 114: 109: 105: 101: 80: 62:of the field, 51: 48: 15: 13: 10: 9: 6: 4: 3: 2: 760: 749: 746: 744: 741: 740: 738: 728: 725: 723: 721: 716: 712: 711: 706: 702: 701: 697: 691: 687: 683: 681:0-521-33060-2 677: 673: 669: 665: 660: 656: 652: 648: 646:0-387-94225-4 642: 638: 634: 630: 626: 622: 618: 614: 612:3-540-63003-1 608: 604: 600: 595: 594: 585: 583: 579: 572: 570: 568: 560: 558: 556: 552: 548: 544: 525: 516: 513: 507: 503: 495: 491: 487: 482: 477: 474: 469: 464: 458: 455: 449: 445: 435: 431: 425: 420: 417: 412: 407: 397: 383: 382: 381: 378: 374: 367: 360: 356: 352: 347: 344: 340: 336: 332: 324: 322: 319: 315: 311: 307: 289: 279: 275: 270: 267: 257: 253: 247: 242: 239: 234: 222: 212: 207: 203: 195: 194: 193: 191: 187: 183: 179: 175: 157: 153: 144: 126: 122: 118: 115: 112: 107: 103: 99: 69: 65: 61: 57: 49: 47: 45: 41: 38: 34: 30: 26: 22: 720:Number Rings 719: 708: 667: 632: 598: 564: 550: 546: 542: 540: 376: 372: 365: 358: 354: 350: 348: 342: 338: 335:prime ideals 328: 317: 313: 309: 305: 304: 184:contains an 181: 67: 63: 60:discriminant 55: 53: 39: 37:number field 33:class number 24: 18: 662:Pohst, M.; 629:Lang, Serge 29:upper bound 737:Categories 710:PlanetMath 690:0685.12001 655:0811.11001 621:0819.11044 573:References 380:, so that 325:Properties 50:Definition 475:π 465:≥ 418:π 408:≥ 243:π 119:− 27:gives an 666:(1989). 631:(1994). 58:be the 688:  678:  653:  643:  619:  609:  523:  353:given 287:  145:where 92:, and 561:Proof 70:over 35:of a 676:ISBN 641:ISBN 607:ISBN 541:For 364:and 190:norm 54:Let 686:Zbl 651:Zbl 617:Zbl 569:. 188:of 180:of 19:In 739:: 707:. 684:. 674:. 649:. 635:. 615:. 605:. 581:^ 557:. 357:, 346:. 321:. 46:. 23:, 722:. 713:. 692:. 657:. 623:. 551:Q 543:n 526:. 517:! 514:n 508:n 504:n 496:2 492:/ 488:n 483:) 478:4 470:( 459:! 456:n 450:n 446:n 436:2 432:r 426:) 421:4 413:( 402:| 398:D 394:| 377:K 373:M 369:2 366:r 362:1 359:r 355:n 351:K 343:K 339:M 318:K 314:M 310:K 290:. 280:n 276:n 271:! 268:n 258:2 254:r 248:) 240:4 235:( 227:| 223:D 219:| 213:= 208:K 204:M 182:K 158:1 154:r 127:1 123:r 116:n 113:= 108:2 104:r 100:2 79:Q 68:K 64:n 56:D 40:K

Index

algebraic number theory
upper bound
class number
number field
Hermann Minkowski
discriminant
complex embeddings
real embeddings
ideal class group
integral ideal
norm
ideal class group
prime ideals
unramified extension
Minkowski's theorem


Springer-Verlag
ISBN
3-540-63003-1
Zbl
0819.11044
Lang, Serge
Graduate Texts in Mathematics
ISBN
0-387-94225-4
Zbl
0811.11001
Zassenhaus, H.
Cambridge University Press

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