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Talk:Rencontres numbers

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Number of permutations of 3 distinct letters (ABC) each with n copies such that one (1) fixed points. E.g. if AAAAABBBBBCCCCC n=3*5 letters permutations then one fixed points n5=15150 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 02 2006
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1, 0, 0, 1, 1, 0, 4, 0, 1, 10, 24, 27, 16, 12, 0, 1, 297, 672, 736, 480, 246, 64, 24, 0, 1, 13756, 30480, 32365, 21760, 10300, 3568, 970, 160, 40, 0, 1, 925705, 2016480, 2116836, 1418720, 677655, 243360, 67920, 14688, 2655, 320, 60, 0, 1
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COMMENT Number of fixed-point-free permutations of n distinct letters (ABCD...), each of which appears twice. If there is only one letter of each type we get A000166. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 15
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Number of fixed-point-free permutations of n distinct letters (ABCD...), each of which appears thrice. If there is only one letter of each type we get A000166. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 15
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sum(coeff(R(x, n, k), x, j)*(t-1)^j*(n*k-j)!, j=0..n*k);seq(f(0, n, 2)/2!^n, n=0..18); (AUTHOR Barbara Haas Margolius (margolius(AT)math.csuohio.edu) )
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sum(coeff(R(x, n, k), x, j)*(t-1)^j*(n*k-j)!, j=0..n*k); seq(f(0, n, 3)/3!^n, n=0..18); (AUTHOR Barbara Haas Margolius (margolius(AT)math.csuohio.edu)
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On the article page the first table is not very pretty. There is no horizontal bar under number 2,3,4,5,6,7 and the verticle bar goes down too far:
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My version doesn't require knowing how many permutations a set has, given its cardinality. In that sense it is simpler.
1891:{\displaystyle X_{i}={\begin{cases}1&{\text{if }}i{\text{ is a fixed point}},\\0&{\text{otherwise}}.\end{cases}}} 33: 1493:
00166 Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points.]
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00166 Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points.]
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A008290 Triangle T(n,k) of rencontres numbers (number of *permutations of n elements with k fixed points).
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Number parallelogram based on Pascal's triangle (and special mirror of central and multiply of diagonal)
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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A059056 Penrice Christmas gift numbers, Card-matching numbers (Dinner-Diner matching numbers).
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A059072 Penrice Christmas gift numbers; card-matching numbers; dinner-diner matching numbers.
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COMMENT: Analogous to A008290. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 10 2005
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For any wikipedians wondering, I should point out that the work or particularly the results
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are not original work. The results have probably been known for a couple of centuries.
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Here the probability distribution is discrete, so taking the expectation is a sumation
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charcters:quadruple, example:AAAA, AAAABBBB, AAAABBBBCCCC, AAAABBBBCCCCDDDD, etc...
2060:{\displaystyle E(X_{1})+\cdots +E(X_{n})={\frac {1}{n}}+\cdots +{\frac {1}{n}}=1.} 1680: 102: 191: 79: 2573: 2552: 2520: 2506:
I've now just noticed that the tables look fine using Opera and IE browsers.
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charcters:quintuple, example:AAAAA, AAAAABBBBB, AAAAABBBBBCCCCC, etc...
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Perhaps one solution would be to put in blanks in those extra cells.
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http://en.wikipedia.org/Formal_power_series#Extracting_coefficients
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The only problem is when they are viewed in Firefox (version 3.5.1)
2099:(I'm now going to make the effort to write the equations properly) 1712: 2197:{\displaystyle E(\sum _{i=1}^{n}X_{i})=\sum _{i=1}^{n}E(X_{i})} 1532:
A059073 Card-matching numbers (Dinner-Diner matching numbers).
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is E_n = sum_p_from_1_to_n! { sum_m_from_1_to_n { X } } / n!
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AAABBBCCCDDD (table sign: 3333)then 13833 derangements, etc.
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Replace approximation by lim specifying range of validity.
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Now let X=1 if in the p_th permutation, element m is fixed,
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I'd argue that the two proofs are almost almost identical.
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E_n = sum_m_from_1_to_n { sum_p_from_1_to_n! { X } } / n!
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etc... A000172 Franel number a(n) = Sum C(n,k)^3, k=0..n.
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k!^2*sum(x^j/((k-j)!^2*j!), j=0..k); R := (x, n, k)-: -->
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k!^2*sum(x^j/((k-j)!^2*j!), j=0..k); R := (x, n, k)-: -->
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Extension: If all character once : example: ABCDE......
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1, 0, 1, 56, 13833, 6699824, 5691917785, 7785547001784,
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1, 0, 1, 2, 9, 44, 265, 1854, 14833, 133496, 1334961...
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AABBCCDD (table sign: 2222)then 297 derangements, etc.
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1, 0, 1, 2, 9, 44, 265, 1854, 14833, 133496, 1334961...
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It is not ideal, but I think it looks a bit better.
2095:The same arguement presented slightly differently. 1513:
AAABBBCCC (table sign: 333)then 56 derangements,
2408: 2311: 2196: 2059: 1947: 1890: 1477:"ABCD" (table sign: 1111)then 9 derangements, etc. 992:"ABCD" (table sign: 1111)then 9 derangements, etc. 2088:Well, I certainly prefer your equation mark-up. 1711:...mirror of central and multiply of diagonal... 1510:AAABBB (table sign: 33)then 1 derangements, 1028:AABBCC (table sign: 222)then 10 derangements, 2398: 2395: 2390: 2388: 2301: 2298: 2293: 2291: 1733:table 1.column :5, 55, 555, 5555, 55555, etc... 1727:table 1.column :4, 44, 444, 4444, 44444, etc... 1714:(Pascal háromszög tükrözése és szorzás. Minta.) 1504:"0" (table sign: "0")then 1 derangements, 1019:"0" (table sign: "0")then 1 derangements, 2223:In my version, I've just shown that explicitly 2220:, we just need to swap the order of summation. 1671:where is it :formula or generating function(?) 1507:AAA (table sign: 3)then 0 derangements, 1087:where is it :formula or generating function(?) 1025:AABB (table sign: 22)then 1 derangements, 1736:a great number of connexion of interesting !! 1042:1, 0, 1, 10, 297, 13756, 925705, 85394646,... 1022:AA (table sign: 2)then 0 derangements, 8: 1772:, the expected number of fixed points is 1 : 1474:"ABC" (table sign: 111)then 2 derangements, 989:"ABC" (table sign: 111)then 2 derangements, 597:If all character twice: example: AABBCC.... 19: 2409:{\displaystyle _{n}\!\!\diagdown \!\!^{k}} 2312:{\displaystyle _{n}\!\!\diagdown \!\!^{k}} 152: 47: 2400: 2382: 2377: 2303: 2285: 2280: 2185: 2169: 2158: 2142: 2132: 2121: 2109: 2041: 2022: 2010: 1982: 1970: 1934: 1915: 1909: 1873: 1856: 1848: 1835: 1826: 1820: 1774:We'll number the permutations p = 1 to n! 1471:"AB" (table sign: 11)then 1 derangements, 1465:"0" (table sign: "0")then 1 derangements, 986:"AB" (table sign: 11)then 1 derangements, 980:"0" (table sign: "0")then 1 derangements, 2369: 2272: 1788:E_n = sum_m_from_1_to_n { (n-1)! } / n! 1780:Now the expected number of fixed points 1461:If original or classic table: (1.table) 1100: 976:If original or classic table: (1.table) 617: 263: 1943: 1468:"A" (table sign: 1)then 0 derangements, 983:"A" (table sign: 1)then 0 derangements, 154: 49: 1948:{\displaystyle X_{1}+\cdots +X_{n},\,} 1104:fixed point: character numbers: 621:fixed point: character numbers: 267:fixed point: character numbers: 1536:FORMULA: MAPLE p := (x, k)-: --> 7: 1053:FORMULA: MAPLE p := (x, k)-: --> 184:This article is within the scope of 95:This article is within the scope of 1902:Then the number of fixed points is 1760:Justification that expectation is 1 38:It is of interest to the following 2605:Low-importance Statistics articles 1554:2.column (free or "0" -fixed point 14: 2595:Low-priority mathematics articles 115:Knowledge:WikiProject Mathematics 2590:Start-Class mathematics articles 204:Knowledge:WikiProject Statistics 177: 156: 118:Template:WikiProject Mathematics 82: 72: 51: 20: 2610:WikiProject Statistics articles 2600:Start-Class Statistics articles 1655:etc... A000489 Card matching. 1630:etc... A000535 Card matching. 1538:p(x, k)^n; f := (t, n, k)-: --> 1055:p(x, k)^n; f := (t, n, k)-: --> 224:This article has been rated as 207:Template:WikiProject Statistics 135:This article has been rated as 2191: 2178: 2148: 2114: 2016: 2003: 1988: 1975: 1756:28. jun. 2007. 16. apr. 2009. 1601:etc... A000279 Card matching. 1: 2540:. Definition can be found at 198:and see a list of open tasks. 109:and see a list of open tasks. 2532:Explain meaning of symbol z. 1636:5.column ( "3" fixed point) 1611:4.column ( "2" fixed point) 1582:3.column ( "1" -fixed point) 2553:08:37, 10 August 2013 (UTC) 2527:Formulae need clarification 2626: 1963:number of fixed points is 1676:where is it :bibliography? 1092:where is it :bibliography? 246:START Zlajos 17 jun 2007 2574:22:18, 5 March 2012 (UTC) 2521:23:54, 19 July 2009 (UTC) 2501:23:23, 19 July 2009 (UTC) 2259:01:07, 20 July 2009 (UTC) 2241:20:52, 19 July 2009 (UTC) 2080:15:01, 19 July 2009 (UTC) 1808:08:42, 19 July 2009 (UTC) 1778:when it is not fixed, X=0 223: 172: 134: 67: 46: 141:project's priority scale 98:WikiProject Mathematics 2410: 2313: 2198: 2174: 2137: 2102:You use the fact that 2061: 1949: 1892: 1813:Simpler argument: Let 1791:E_n = n * (n-1)! / n! 187:WikiProject Statistics 28:This article is rated 2411: 2314: 2199: 2154: 2117: 2062: 1950: 1893: 2538:coefficient 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982: 979: 978: 977: 969: 966: 963: 960: 957: 954: 951: 948: 945: 942: 939: 936: 933: 930: 929: 925: 922: 919: 916: 913: 910: 907: 904: 901: 898: 895: 892: 889: 886: 885: 882: 880: 877: 874: 871: 868: 865: 862: 859: 856: 853: 850: 847: 844: 843: 840: 838: 836: 834: 831: 828: 825: 822: 819: 816: 813: 810: 807: 804: 803: 800: 798: 796: 794: 792: 790: 787: 784: 781: 778: 775: 772: 769: 766: 765: 762: 760: 758: 756: 754: 752: 750: 748: 745: 742: 739: 736: 733: 730: 729: 726: 724: 722: 720: 718: 716: 714: 712: 710: 708: 705: 702: 699: 696: 695: 692: 690: 688: 686: 684: 682: 680: 678: 676: 674: 672: 670: 667: 664: 663: 659: 656: 653: 650: 647: 644: 641: 638: 635: 632: 629: 626: 623: 620: 619: 613: 611: 607: 601: 599: 596: 595: 590: 588: 586: 584: 582: 579: 576: 573: 570: 567: 564: 561: 558: 555: 554: 551: 549: 547: 545: 543: 541: 538: 535: 532: 529: 526: 523: 520: 517: 516: 513: 511: 509: 507: 505: 503: 501: 498: 495: 492: 489: 486: 483: 480: 479: 476: 474: 472: 470: 468: 466: 464: 462: 459: 456: 453: 450: 447: 444: 443: 440: 438: 436: 434: 432: 430: 428: 426: 424: 421: 418: 415: 412: 409: 408: 405: 403: 401: 399: 397: 395: 393: 391: 389: 387: 384: 381: 378: 375: 374: 371: 369: 367: 365: 363: 361: 359: 357: 355: 353: 351: 348: 345: 342: 341: 338: 336: 334: 332: 330: 328: 326: 324: 322: 320: 318: 316: 313: 310: 309: 305: 302: 299: 296: 293: 290: 287: 284: 281: 278: 275: 272: 269: 266: 265: 259: 254: 252: 251: 250: 247: 231: 227: 221: 218: 217: 214: 197: 193: 189: 188: 183: 180: 176: 175: 171: 165: 162: 159: 155: 142: 138: 132: 129: 128: 125: 108: 104: 100: 99: 91: 85: 80: 78: 75: 71: 70: 66: 60: 57: 54: 50: 45: 41: 35: 27: 23: 18: 17: 2560:— Preceding 2537: 2489: 2366: 2268: 2265:Table format 2217: 2216:So to prove 2206: 1797: 1769: 1765: 1763: 1752: 1739: 1654: 1651: 1648: 1645: 1643:222 :16 1642: 1639: 1629: 1626: 1623: 1620: 1618:222 :27 1617: 1614: 1605: 1600: 1597: 1594: 1591: 1589:222 :24 1588: 1585: 1575: 1572: 1569: 1567:333 :56 1566: 1564:222 :10 1563: 1560: 1557: 1549: 1535: 1521:column : --> 1496: 1482:column : --> 1460: 1400:14125889160 1397:24571261710 1394:32659846104 1391:31234760055 1388:19180338840 1107:free or "0" 1067: 1058: 1052: 1036:column : --> 1011: 997:column : --> 975: 624:free or "0" 608: 605: 270:free or "0" 248: 245: 225: 185: 137:Low-priority 136: 96: 62:Low‑priority 40:WikiProjects 1640:111 :1 1615:111 :0 1586:111 :3 1561:111 :2 1522:free or 0 : 1483:free or 0 : 1406:2375679240 1403:6433608330 1385:5691917785 1037:free or 0 : 998:free or 0 : 112:Mathematics 103:mathematics 59:Mathematics 30:Start-class 2584:Categories 1719:continued: 1412:182701480 1409:722303568 943:128058000 940:191384599 937:183749160 201:Statistics 192:statistics 164:Statistics 2545:Heycarnut 1875:otherwise 1709:Demo: --> 1415:38712600 1356:17399178 1353:30573900 1350:40563765 1347:38358540 1344:23123880 1072:Question: 949:22558928 946:61585776 934:85394646 2562:unsigned 1961:expected 1426:3333333 1421:1035330 1418:6889320 1362:2729295 1359:7723640 1341:6699824 955:1507392 952:6506955 931:2222222 899:1418720 896:2116836 893:2016480 556:1111111 2513:Pnelnik 2493:Pnelnik 2233:Pnelnik 1959:so the 1800:Pnelnik 1794:E_n = 1 1661:3.table 1382:333333 1368:180100 1365:776520 1097:3.table 1077:2.table 958:284550 905:243360 902:677655 890:925705 887:222222 614:2.table 518:111111 260:1.table 228:on the 139:on the 2207:(eqn1) 1793:=: --> 1790:=: --> 1787:=: --> 1784:=: --> 1754:Zlajos 1741:Zlajos 1497:then: 1371:33372 1338:33333 1315:16476 1312:38448 1309:69039 1306:90944 1303:84510 1300:49464 1297:13833 1012:then: 961:43848 911:14688 908:67920 860:10300 857:21760 854:32365 851:30480 848:13756 845:22222 481:11111 36:scale. 1747:copy: 1710:: --> 1704:: --> 1698:: --> 1692:: --> 1374:5355 1321:1431 1318:5184 1294:3333 964:5901 914:2655 863:3568 805:2222 562:1855 559:1854 445:1111 2570:talk 2549:talk 2517:talk 2497:talk 2255:talk 2237:talk 2218:eqn1 2076:talk 1804:talk 1686:OEIS 1546:2006 1435:etc 1377:540 1324:216 1271:189 1268:324 1265:435 1262:378 1259:216 1253:333 1148:"0" 1064:2006 967:560 917:320 869:160 866:970 820:246 817:480 814:736 811:672 808:297 767:222 665:"0" 568:315 565:924 527:135 524:264 521:265 410:111 311:"0" 1850:if 1327:54 1277:27 1274:54 1256:56 1215:33 1143:12 1140:11 1137:10 970:84 920:60 872:40 826:24 823:64 782:12 779:16 776:27 773:24 770:10 731:22 660:12 657:11 654:10 574:21 571:70 533:15 530:40 493:10 490:20 487:45 484:44 376:11 306:12 303:11 300:10 220:Low 131:Low 2586:: 2572:) 2551:) 2519:) 2499:) 2472:1 2469:0 2466:1 2447:1 2444:0 2439:7 2393:╲ 2361:1 2358:0 2355:1 2350:1 2347:0 2342:7 2296:╲ 2257:) 2239:) 2156:∑ 2119:∑ 2078:) 2055:1. 2036:⋯ 1995:⋯ 1925:⋯ 1806:) 1768:≥ 1657:] 1632:] 1578:] 1541:] 1333:1 1330:0 1283:1 1280:0 1236:1 1233:0 1230:9 1227:0 1224:9 1221:0 1218:1 1192:1 1189:0 1186:0 1183:0 1180:3 1151:1 1134:9 1131:8 1128:7 1125:6 1122:5 1119:4 1116:3 1113:2 1110:1 926:1 923:0 878:1 875:0 832:1 829:0 788:1 785:0 746:1 743:0 740:4 737:0 734:1 706:1 703:0 700:0 697:2 668:1 651:9 648:8 645:7 642:6 639:5 636:4 633:3 630:2 627:1 580:1 577:0 539:1 536:0 499:1 496:0 460:1 457:0 454:6 451:8 448:9 422:1 419:0 416:3 413:2 385:1 382:0 379:1 349:1 346:0 343:1 314:1 297:9 294:8 291:7 288:6 285:5 282:4 279:3 276:2 273:1 2568:( 2547:( 2515:( 2495:( 2436:6 2433:5 2430:4 2427:3 2424:2 2421:1 2418:0 2402:k 2384:n 2339:6 2336:5 2333:4 2330:3 2327:2 2324:1 2321:0 2305:k 2287:n 2253:( 2235:( 2192:) 2187:i 2183:X 2179:( 2176:E 2171:n 2166:1 2163:= 2160:i 2152:= 2149:) 2144:i 2140:X 2134:n 2129:1 2126:= 2123:i 2115:( 2112:E 2074:( 2052:= 2047:n 2044:1 2039:+ 2033:+ 2028:n 2025:1 2020:= 2017:) 2012:n 2008:X 2004:( 2001:E 1998:+ 1992:+ 1989:) 1984:1 1980:X 1976:( 1973:E 1941:, 1936:n 1932:X 1928:+ 1922:+ 1917:1 1913:X 1879:. 1869:0 1862:, 1854:i 1844:1 1838:{ 1833:= 1828:i 1824:X 1802:( 1770:1 1766:n 1749:] 1049:] 602:] 255:] 232:. 143:. 42::

Index


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Zlajos
Zlajos
Pnelnik
talk
08:42, 19 July 2009 (UTC)

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