Knowledge (XXG)

Cyclotomic identity

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Combinatorics and algebra (Boulder, Colo., 1983). Proceedings of the AMS-IMS-SIAM joint summer research conference held at the University of Colorado, Boulder, Colo., June 5–11, 1983.
33: 164: 481:{\displaystyle \prod _{j=1}^{\infty }\left({1 \over 1-\alpha z^{j}}\right)^{M(\beta ,j)}=\prod _{j=1}^{\infty }\left({1 \over 1-\beta z^{j}}\right)^{M(\alpha ,j)}} 155: 521: 547: 513: 297: 552: 296:
for the free associative algebra on α generators, and the right hand side is the generating function for the
286: 140:{\displaystyle {1 \over 1-\alpha z}=\prod _{j=1}^{\infty }\left({1 \over 1-z^{j}}\right)^{M(\alpha ,j)}} 304:
on α generators. The cyclotomic identity witnesses the fact that these two algebras are isomorphic.
293: 271: 256:{\displaystyle M(\alpha ,n)={1 \over n}\sum _{d\,|\,n}\mu \left({n \over d}\right)\alpha ^{d},} 517: 507: 301: 531: 527: 499: 541: 503: 307:
There is also a symmetric generalization of the cyclotomic identity found by Strehl:
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Expresses 1/(1-az) as an infinite product using Moreau's necklace-counting function
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The name comes from the denominator, 1 − 
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The left hand side of the cyclotomic identity is the
167: 36: 512:, Contemp. Math., vol. 34, Providence, R.I.: 480: 255: 139: 8: 457: 444: 425: 414: 403: 375: 362: 343: 332: 321: 315: 244: 226: 213: 208: 207: 203: 189: 166: 116: 103: 87: 76: 65: 37: 35: 502:(1984), "The cyclotomic identity", in 7: 156:Moreau's necklace-counting function 415: 333: 77: 14: 473: 461: 391: 379: 209: 183: 171: 132: 120: 1: 514:American Mathematical Society 298:universal enveloping algebra 569: 285:, which is the product of 548:Mathematical identities 482: 419: 337: 287:cyclotomic polynomials 257: 141: 81: 483: 399: 317: 258: 142: 61: 314: 165: 34: 294:generating function 25:cyclotomic identity 516:, pp. 19–27, 478: 253: 218: 137: 553:Infinite products 523:978-0-8218-5029-9 451: 369: 234: 199: 197: 110: 56: 560: 534: 500:Rota, Gian-Carlo 498:Metropolis, N.; 487: 485: 484: 479: 477: 476: 456: 452: 450: 449: 448: 426: 418: 413: 395: 394: 374: 370: 368: 367: 366: 344: 336: 331: 302:free Lie algebra 262: 260: 259: 254: 249: 248: 239: 235: 227: 217: 212: 198: 190: 146: 144: 143: 138: 136: 135: 115: 111: 109: 108: 107: 88: 80: 75: 57: 55: 38: 568: 567: 563: 562: 561: 559: 558: 557: 538: 537: 524: 497: 494: 440: 430: 421: 420: 358: 348: 339: 338: 312: 311: 272:Möbius function 270:is the classic 240: 222: 163: 162: 99: 92: 83: 82: 42: 32: 31: 17: 12: 11: 5: 566: 564: 556: 555: 550: 540: 539: 536: 535: 522: 504:Greene, Curtis 493: 490: 489: 488: 475: 472: 469: 466: 463: 460: 455: 447: 443: 439: 436: 433: 429: 424: 417: 412: 409: 406: 402: 398: 393: 390: 387: 384: 381: 378: 373: 365: 361: 357: 354: 351: 347: 342: 335: 330: 327: 324: 320: 264: 263: 252: 247: 243: 238: 233: 230: 225: 221: 216: 211: 206: 202: 196: 193: 188: 185: 182: 179: 176: 173: 170: 148: 147: 134: 131: 128: 125: 122: 119: 114: 106: 102: 98: 95: 91: 86: 79: 74: 71: 68: 64: 60: 54: 51: 48: 45: 41: 15: 13: 10: 9: 6: 4: 3: 2: 565: 554: 551: 549: 546: 545: 543: 533: 529: 525: 519: 515: 511: 510: 505: 501: 496: 495: 491: 470: 467: 464: 458: 453: 445: 441: 437: 434: 431: 427: 422: 410: 407: 404: 400: 396: 388: 385: 382: 376: 371: 363: 359: 355: 352: 349: 345: 340: 328: 325: 322: 318: 310: 309: 308: 305: 303: 299: 295: 290: 288: 284: 279: 277: 276:number theory 273: 269: 250: 245: 241: 236: 231: 228: 223: 219: 214: 204: 200: 194: 191: 186: 180: 177: 174: 168: 161: 160: 159: 157: 153: 129: 126: 123: 117: 112: 104: 100: 96: 93: 89: 84: 72: 69: 66: 62: 58: 52: 49: 46: 43: 39: 30: 29: 28: 26: 22: 508: 306: 291: 282: 280: 267: 265: 151: 149: 27:states that 24: 18: 21:mathematics 542:Categories 492:References 465:α 438:β 435:− 416:∞ 401:∏ 383:β 356:α 353:− 334:∞ 319:∏ 242:α 220:μ 201:∑ 175:α 124:α 97:− 78:∞ 63:∏ 50:α 47:− 532:0777692 506:(ed.), 300:of the 530:  520:  150:where 23:, the 518:ISBN 278:. 266:and 274:of 154:is 19:In 544:: 528:MR 526:, 289:. 158:, 474:) 471:j 468:, 462:( 459:M 454:) 446:j 442:z 432:1 428:1 423:( 411:1 408:= 405:j 397:= 392:) 389:j 386:, 380:( 377:M 372:) 364:j 360:z 350:1 346:1 341:( 329:1 326:= 323:j 283:z 268:μ 251:, 246:d 237:) 232:d 229:n 224:( 215:n 210:| 205:d 195:n 192:1 187:= 184:) 181:n 178:, 172:( 169:M 152:M 133:) 130:j 127:, 121:( 118:M 113:) 105:j 101:z 94:1 90:1 85:( 73:1 70:= 67:j 59:= 53:z 44:1 40:1

Index

mathematics
Moreau's necklace-counting function
Möbius function
number theory
cyclotomic polynomials
generating function
universal enveloping algebra
free Lie algebra
Rota, Gian-Carlo
Greene, Curtis
Combinatorics and algebra (Boulder, Colo., 1983). Proceedings of the AMS-IMS-SIAM joint summer research conference held at the University of Colorado, Boulder, Colo., June 5–11, 1983.
American Mathematical Society
ISBN
978-0-8218-5029-9
MR
0777692
Categories
Mathematical identities
Infinite products

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