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Hajós's theorem

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150: 104: 142:
later proved the statement when the factors are only required to contain the identity element and be of prime cardinality. Rédei's proof of Hajós's theorem was simplified by
258: 200: 124: 438: 366: 351:; Szabó, Sándor (1994), "The group theoretic version of Minkowski's conjecture; more about the algebraic version of Minkowski s conjecture", 153:
In this lattice tiling of the plane by congruent squares, the green and violet squares meet edge-to-edge as do the blue and orange squares.
358: 433: 312: 271: 39: 204: 269:(1965), "Die neue Theorie der endlichen abelschen Gruppen und Verallgemeinerung des Hauptsatzes von Hajós", 166: 266: 165:, which says that in any lattice tiling of space by cubes, there are two cubes that meet face to face. 139: 413: 352: 329: 296: 221: 179: 169:
is the same conjecture for non-lattice tilings, which turns out to be false in high dimensions.
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An equivalent statement on homogeneous linear forms was originally conjectured by
386:(1949), "Neuer vereinfachter Beweis des gruppentheoretischen Satzes von Hajós", 383: 143: 135: 400: 127: 333: 284: 217: 33: 325: 126:
is the identity element, then at least one of the factors is a
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Algebra and Tiling: Homomorphisms in the Service of Geometry
130:. The theorem was proved by the Hungarian mathematician 188: 161:. A consequence is Minkowski's conjecture on lattice 112: 42: 182:(1941), "Über einfache und mehrfache Bedeckung des 194: 118: 98: 272:Acta Mathematica Academiae Scientiarum Hungaricae 357:, Carus Mathematical Monographs, vol. 25, 202:-dimensionalen Raumes mit einem Würfelgitter", 8: 99:{\displaystyle \{e,a,a^{2},\dots ,a^{s-1}\}} 93: 43: 257:: CS1 maint: location missing publisher ( 399: 187: 111: 81: 62: 41: 148: 250: 7: 388:Publicationes Mathematicae Debrecen 359:Mathematical Association of America 14: 439:Conjectures that have been proved 247:(in German), Leipzig, p. 28 1: 313:American Mathematical Monthly 245:Diophantische Approximationen 310:(1974), "Algebraic tiling", 36:, that is, sets of the form 455: 205:Mathematische Zeitschrift 434:Theorems in group theory 24:states that if a finite 401:10.5486/PMD.1949.1.1.10 196: 154: 120: 100: 197: 152: 121: 101: 186: 110: 40: 28:is expressed as the 167:Keller's conjecture 361:, pp. 23–28, 285:10.1007/BF01904843 218:10.1007/BF01180974 192: 155: 116: 96: 368:978-0-88385-028-2 349:Stein, Sherman K. 195:{\displaystyle n} 159:Hermann Minkowski 119:{\displaystyle e} 30:Cartesian product 446: 420: 403: 379: 344: 303: 279:(3–4): 329–373, 262: 256: 248: 236: 201: 199: 198: 193: 125: 123: 122: 117: 105: 103: 102: 97: 92: 91: 67: 66: 454: 453: 449: 448: 447: 445: 444: 443: 424: 423: 382: 369: 347: 326:10.2307/2318582 306: 265: 249: 239: 184: 183: 178: 175: 108: 107: 77: 58: 38: 37: 22:Hajós's theorem 12: 11: 5: 452: 450: 442: 441: 436: 426: 425: 422: 421: 380: 367: 345: 320:(5): 445–462, 304: 263: 237: 191: 174: 171: 134:in 1941 using 115: 95: 90: 87: 84: 80: 76: 73: 70: 65: 61: 57: 54: 51: 48: 45: 13: 10: 9: 6: 4: 3: 2: 451: 440: 437: 435: 432: 431: 429: 419: 415: 411: 407: 402: 397: 393: 390:(in German), 389: 385: 381: 378: 374: 370: 364: 360: 356: 355: 350: 346: 343: 339: 335: 331: 327: 323: 319: 315: 314: 309: 305: 302: 298: 294: 290: 286: 282: 278: 275:(in German), 274: 273: 268: 264: 260: 254: 246: 242: 241:Minkowski, H. 238: 235: 231: 227: 223: 219: 215: 211: 208:(in German), 207: 206: 189: 181: 177: 176: 172: 170: 168: 164: 160: 151: 147: 145: 141: 137: 133: 129: 113: 88: 85: 82: 78: 74: 71: 68: 63: 59: 55: 52: 49: 46: 35: 31: 27: 26:abelian group 23: 19: 391: 387: 353: 317: 311: 308:Stein, S. K. 276: 270: 244: 209: 203: 180:Hajós, Georg 156: 132:György Hajós 21: 18:group theory 15: 212:: 427–467, 144:Tibor Szele 136:group rings 428:Categories 234:0025.25401 173:References 418:253650078 394:: 56–62, 384:Szele, T. 301:122838903 267:Rédei, L. 226:127629936 86:− 72:… 34:simplexes 253:citation 243:(1907), 128:subgroup 410:0032620 377:1311249 342:0340063 334:2318582 293:0186729 163:tilings 416:  408:  375:  365:  340:  332:  299:  291:  232:  224:  106:where 414:S2CID 330:JSTOR 297:S2CID 222:S2CID 140:Rédei 363:ISBN 259:link 396:doi 322:doi 281:doi 230:Zbl 214:doi 32:of 16:In 430:: 412:, 406:MR 404:, 373:MR 371:, 338:MR 336:, 328:, 318:81 316:, 295:, 289:MR 287:, 277:16 255:}} 251:{{ 228:, 220:, 210:47 146:. 138:. 20:, 398:: 392:1 324:: 283:: 261:) 216:: 190:n 114:e 94:} 89:1 83:s 79:a 75:, 69:, 64:2 60:a 56:, 53:a 50:, 47:e 44:{

Index

group theory
abelian group
Cartesian product
simplexes
subgroup
György Hajós
group rings
Rédei
Tibor Szele

Hermann Minkowski
tilings
Keller's conjecture
Hajós, Georg
Mathematische Zeitschrift
doi
10.1007/BF01180974
S2CID
127629936
Zbl
0025.25401
Minkowski, H.
citation
link
Rédei, L.
Acta Mathematica Academiae Scientiarum Hungaricae
doi
10.1007/BF01904843
MR
0186729

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