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Abhyankar's conjecture

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590: 85: 585: 511: 356: 135: 575: 48: 44: 580: 204: 464: 421: 99: 54:. The soluble case was solved by Serre in 1990 and the full conjecture was proved in 1994 by work of 17: 556: 310: 102: 36: 560: 539: 507: 383: 188: 517: 480: 472: 437: 429: 395: 365: 116: 24: 502:, Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge, vol. 11 (3rd ed.), 542: 521: 503: 484: 441: 399: 267: 236: 192: 92: 468: 425: 412:
Raynaud, Michel (1994), "Revêtements de la droite affine en caractéristique p > 0",
386:(1990), "Construction de revêtements étales de la droite affine en caractéristique p", 224: 59: 55: 569: 78: 71: 40: 455:
Harbater, David (1994), "Abhyankar's conjecture on Galois groups over curves",
32: 547: 150: 476: 433: 369: 171:
Geometrically, the assertion that π is ramified at a finite set
354:
Abhyankar, Shreeram (1957), "Coverings of Algebraic Curves",
223:) is defined to be the subgroup generated by all the 388:Comptes Rendus de l'AcadĂ©mie des Sciences, SĂ©rie I 305:The general case was proved by Harbater, in which 243:is defined as the minimum number of generators of 557:A layman's perspective of Abhyankar's conjecture 179:means that Ď€ restricted to the complement of 8: 203:can be. This is therefore a special type of 115:The question addresses the existence of a 498:Fried, Michael D.; Jarden, Moshe (2008), 346: 191:. This is in analogy with the case of 278:can be realised as a Galois group of 7: 134:as Galois group, and with specified 199:is fixed, and the question is what 138:. From a geometric point of view, 14: 591:Conjectures that have been proved 357:American Journal of Mathematics 321:can be realised if and only if 262:Raynaud proved the case where 1: 274:, the conjecture states that 195:. In Abhyankar's conjecture, 142:corresponds to another curve 586:Theorems in abstract algebra 290:+ 1 points, if and only if 607: 91:of a nonsingular integral 15: 45:algebraic function fields 543:"Abhyankar's conjecture" 457:Inventiones Mathematicae 414:Inventiones Mathematicae 16:Not to be confused with 70:The problem involves a 205:inverse Galois problem 39:posed in 1957, on the 29:Abhyankar's conjecture 282:, unramified outside 231:for the prime number 239:, and the parameter 100:algebraically closed 469:1994InMat.117....1H 426:1994InMat.116..425R 540:Weisstein, Eric W. 477:10.1007/BF01232232 434:10.1007/BF01231568 384:Serre, Jean-Pierre 149:, together with a 108:of characteristic 37:Shreeram Abhyankar 561:Purdue University 513:978-3-540-77269-9 18:Abhyankar's lemma 598: 576:Algebraic curves 553: 552: 525: 524: 500:Field arithmetic 495: 489: 487: 452: 446: 444: 409: 403: 402: 380: 374: 372: 351: 193:Riemann surfaces 161: 147: 117:Galois extension 98:defined over an 25:abstract algebra 606: 605: 601: 600: 599: 597: 596: 595: 566: 565: 538: 537: 534: 529: 528: 514: 504:Springer-Verlag 497: 496: 492: 454: 453: 449: 411: 410: 406: 382: 381: 377: 370:10.2307/2372438 353: 352: 348: 343: 268:projective line 237:normal subgroup 225:Sylow subgroups 213: 159: 145: 93:algebraic curve 68: 21: 12: 11: 5: 604: 602: 594: 593: 588: 583: 578: 568: 567: 564: 563: 554: 533: 532:External links 530: 527: 526: 512: 506:, p. 70, 490: 447: 420:(1): 425–462, 404: 394:(6): 341–346, 375: 364:(4): 825–856, 345: 344: 342: 339: 338: 337: 303: 302: 260: 259: 212: 209: 189:Ă©tale morphism 169: 168: 86:function field 67: 64: 60:David Harbater 56:Michel Raynaud 49:characteristic 13: 10: 9: 6: 4: 3: 2: 603: 592: 589: 587: 584: 582: 581:Galois theory 579: 577: 574: 573: 571: 562: 558: 555: 550: 549: 544: 541: 536: 535: 531: 523: 519: 515: 509: 505: 501: 494: 491: 486: 482: 478: 474: 470: 466: 462: 458: 451: 448: 443: 439: 435: 431: 427: 423: 419: 415: 408: 405: 401: 397: 393: 390:(in French), 389: 385: 379: 376: 371: 367: 363: 359: 358: 350: 347: 340: 335: 331: 327: 324: 323: 322: 320: 316: 312: 308: 300: 296: 293: 292: 291: 289: 285: 281: 277: 273: 269: 265: 257: 253: 249: 246: 245: 244: 242: 238: 234: 230: 226: 222: 218: 215:The subgroup 210: 208: 206: 202: 198: 194: 190: 186: 182: 178: 175:of points on 174: 166: 162: 155: 154: 153: 152: 148: 141: 137: 133: 129: 125: 121: 118: 113: 111: 107: 104: 101: 97: 94: 90: 87: 83: 80: 76: 73: 65: 63: 61: 57: 53: 50: 46: 42: 41:Galois groups 38: 34: 30: 26: 19: 546: 499: 493: 460: 456: 450: 417: 413: 407: 391: 387: 378: 361: 355: 349: 333: 329: 325: 318: 314: 306: 304: 298: 294: 287: 283: 279: 275: 271: 263: 261: 255: 251: 247: 240: 235:. This is a 232: 228: 220: 216: 214: 200: 196: 184: 180: 176: 172: 170: 164: 157: 143: 139: 136:ramification 131: 127: 123: 119: 114: 109: 105: 95: 88: 81: 79:prime number 74: 72:finite group 69: 51: 28: 22: 463:(1): 1–25, 286:containing 570:Categories 522:1145.12001 485:0805.14014 442:0798.14013 400:0726.14021 341:References 84:, and the 33:conjecture 548:MathWorld 156:Ď€ : 66:Statement 151:morphism 130:), with 465:Bibcode 422:Bibcode 309:is the 266:is the 211:Results 520:  510:  483:  440:  398:  187:is an 559:from 311:genus 270:over 103:field 31:is a 508:ISBN 332:+ 2 317:and 89:K(C) 77:, a 58:and 518:Zbl 481:Zbl 473:doi 461:117 438:Zbl 430:doi 418:116 396:Zbl 392:311 366:doi 313:of 227:of 183:in 122:of 47:of 43:of 35:of 23:In 572:: 545:. 516:, 479:, 471:, 459:, 436:, 428:, 416:, 362:79 360:, 328:≤ 297:≤ 258:). 207:. 163:→ 112:. 62:. 27:, 551:. 488:. 475:: 467:: 445:. 432:: 424:: 373:. 368:: 336:. 334:g 330:s 326:n 319:G 315:C 307:g 301:. 299:s 295:n 288:s 284:S 280:L 276:G 272:K 264:C 256:G 254:( 252:p 250:/ 248:G 241:n 233:p 229:G 221:G 219:( 217:p 201:G 197:S 185:C 181:S 177:C 173:S 167:. 165:C 160:′ 158:C 146:′ 144:C 140:L 132:G 128:C 126:( 124:K 120:L 110:p 106:K 96:C 82:p 75:G 52:p 20:.

Index

Abhyankar's lemma
abstract algebra
conjecture
Shreeram Abhyankar
Galois groups
algebraic function fields
characteristic
Michel Raynaud
David Harbater
finite group
prime number
function field
algebraic curve
algebraically closed
field
Galois extension
ramification
morphism
Ă©tale morphism
Riemann surfaces
inverse Galois problem
Sylow subgroups
normal subgroup
projective line
genus
American Journal of Mathematics
doi
10.2307/2372438
Serre, Jean-Pierre
Zbl

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