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Talk:Cauchy product

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Update: I've cleaned up the notation somewhat; it would be nice if someone can proofread this and make sure I haven't introduced any silly errors. There seems to be some confusion as to whether the "Cauchy product" refers to the sequence or the series or both. It bothers me that the lead paragraph
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I agree that the formula is correct: the left hand side equals the right hand side. There is no problem there. The issue is that I don't think it belongs on this page: I don't believe that it's actually called "Cauchy product". The point of the Cauchy product for infinite series is that when you
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Cesaro's theorem is currently unsourced. It traces back to Cesaro. See Silverman's book "On the Definition of the Sum of a Divergent Series", p.27, Thm. J for a modern English statement. He cites "Cesaro: Bull des Sciences math, t. XIV 1890". I do not presently have an inclination to figure out
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tends to infinity, the right-hand side converges to the Cauchy product. As formal power series, convergence in the adic topology is trivial. Convergence in the usual topology (as a series of real numbers, not as a formal power series) is not always true. Indeed, the article already gives the
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I've removed the "unreferenced" tag and added a reference to Apostol. This includes most of the content, but not Cesaro's theorem; a further reference would be good. I've tagged the article "attention needed", as I find the notation C(x,y) somewhat confusing, and the use of
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I don't think this formula is relevant to this article. It should probably be in some other article on finite series. My objection is that this formula isn't a Cauchy product; as far as I'm concerned, Cauchy products are only defined for infinite
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that I had deleted. In my view, this concept is too advanced for the main audience of this article: first-year B.S. students in mathematics or second-year B.S. students in engineering. The relation to semigroup algebras would make sense in article
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09:47, 22 November 2011β€Ž 46.17.97.92 (talk)β€Ž (9,053 bytes) (Undid revision 461850889 by Jowa fan (talk) This formula comes from the lessons of calculus from my university (moscow state university) in elec.engin. Why it is a nonsense?) (undo)
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and the section "series" seem to say much the same; can anyone think of a nice way of rewriting the lead without using mathematical notation? The sections "Generalizations" and "Relation to convolution of functions" seem to be unsourced.
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I changed the formulation of Cesaro's theorem. I believe the theorem was intended to be read in a way that would make it corect but there was a notational conflict with the rest of the article rendering it liable to be misunderstood.
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It is quite interesting the fact that if n goes to infinity this summation product become the series Cauchy product. ________________________________________________________________________________________________
841:{\displaystyle \left(\sum _{k=0}^{n}a_{k}\right)\cdot \left(\sum _{k=0}^{n}b_{k}\right)=\sum _{k=0}^{2n}\sum _{i=0}^{k}a_{i}b_{k-i}-\sum _{k=0}^{n-1}(a_{k}\sum _{i=n+1}^{2n-k}b_{i}+b_{k}\sum _{i=n+1}^{2n-k}a_{i})} 326: 1152: 1467: 1243: 226: 3057: 2943: 2590: 1371: 140: 1298: 895:
13:24, 22 November 2011β€Ž Jowa fan (talk | contribs)β€Ž (8,534 bytes) (Undid revision 461914058 by 46.17.97.92 (talk) 1. It's not clear what c_k equals; 2. See policy at WP:SOURCE) (undo)
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23:41, 21 November 2011β€Ž Jowa fan (talk | contribs)β€Ž (8,534 bytes) (Undid revision 461802692 by 46.17.97.92 (talk) remove new section: no sources, and it doesn't make sense) (undo)
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Hello Jowa fan, I think i will proofread the article today evening; my talk page indicates that it would be a good idea to finally do something useful here anyways. Good day, --
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It is interesting that if we increase n by 1 all the formula "shifts" by one row and it is not necessary to delete the two "side" terms on k=4. We need to delete from k=5.
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Who decided the scope of the article? I understand the engineering students may not be interested in semigroup algebras; those readers should just skip the section. --
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strikes me as too informal. I'm not sure whether it would be better to give a clear definition of "C(x,y)", or rewrite the article to avoid using that notation.
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I also changed Spanish entry and noticed that the French and German entries have essentially the same counterexample, with brief proofs of the divergence.
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for your formula. I agree that the formula is correct; the part that doesn't make sense to me is whether it belongs on this page.
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Knowledge's citation system enough to edit the article with this information, but I wanted to at least put it somewhere public.
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I'm editing the article to remove these statements. Can anyone think of a better home for the remaining formula?
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and whose Cauchy square does converge, though conditionally, contrary to the stated. I put the counterexample
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Because of the minus in front of the second piece, this delete the superabundant terms of the first piece.
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In addition, I believe that some of the text is wrong. The article claims that it's interesting that as
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sum an infinite series, the answer may depend on the order of summation. So the Cauchy product defines
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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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If the product comes from two finite summations, up to n, the Cauchy Product is defined as
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I took a piece of paper and I tried to puzzle over the formula. I made the case n=3.
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The beautifulness of a mathematical formula is that anyone can verify it.
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In these days I was bustling about with this formulas so I arrived here.
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If nβ†’βˆž we don't need to cancel anything and we have the Cauchy product.
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In my opinion this could be "wikipediafied". What do you think?
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If n is increased by 2 we'll start to delete from k=6 and so on.
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fixing but issues. It is well defined and its Cauchy square
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The formula comes from lesson notes I took at university.
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is that I want to verify whether anyone uses the name
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Indeed, as stated, 115:Knowledge:WikiProject Mathematics 3080:Start-Class mathematics articles 3050: 2811:The reason why I gave a link to 158:Convergence and Mertens' theorem 118:Template:WikiProject Mathematics 82: 72: 51: 20: 135:This article has been rated as 2902: 2892: 2536: 2417: 2252: 2217: 2117: 1912: 1747: 1605: 1486: 1390: 1317: 1267: 1141: 1089: 1086: 1034: 835: 717: 295: 285: 203: 193: 1: 3045:12:58, 14 November 2015 (UTC) 3030:11:52, 14 November 2015 (UTC) 2990:18:22, 12 November 2015 (UTC) 2964:19:45, 27 November 2011 (UTC) 2836:23:14, 22 November 2011 (UTC) 2619:14:38, 22 November 2011 (UTC) 916:On the first member we have: 162:I changed the counterexample 109:and see a list of open tasks. 409:12:46, 22 January 2011 (UTC) 395:12:38, 22 January 2011 (UTC) 3101: 487:02:16, 30 April 2011 (UTC) 472:02:51, 28 April 2011 (UTC) 429:12:15, 15 March 2010 (UTC) 385:doesn't converge to zero. 351:{\displaystyle \sum b_{n}} 3051:Cesaro's theorem citation 502:17:51, 4 March 2014 (UTC) 134: 67: 46: 141:project's priority scale 3066:07:56, 3 May 2022 (UTC) 434:Notation and references 413: 228:, which can't start at 98:WikiProject Mathematics 2939: 2801: 2773: 2746: 2719: 2692: 2646: 2586: 2513: 2394: 2224: 2206: 2156: 2116: 2086:and the second piece: 2077: 1889: 1724: 1582: 1463: 1367: 1294: 1239: 1208: 1187: 1148: 1015: 995: 951: 842: 824: 765: 716: 660: 639: 597: 553: 456: 455:{\displaystyle \sum x} 379: 352: 322: 281: 248: 222: 189: 157: 28:This article is rated 2940: 2802: 2799:{\displaystyle k: --> 2774: 2772:{\displaystyle b_{k}} 2747: 2745:{\displaystyle a_{k}} 2720: 2718:{\displaystyle c_{n}} 2693: 2647: 2645:{\displaystyle c_{n}} 2587: 2514: 2395: 2225: 2180: 2130: 2096: 2078: 1890: 1725: 1583: 1464: 1368: 1295: 1240: 1188: 1167: 1149: 1016: 975: 931: 843: 789: 730: 690: 640: 616: 577: 533: 457: 380: 378:{\displaystyle b_{n}} 353: 323: 261: 249: 223: 169: 3018:Discrete convolution 2978:Summation#Identities 2863: 2784: 2756: 2729: 2702: 2656: 2629: 2524: 2405: 2240: 2233:that generate this: 2093: 1900: 1735: 1593: 1474: 1378: 1305: 1255: 1248:that generate this: 1164: 1031: 923: 525: 512:I added this piece: 443: 362: 332: 258: 232: 166: 121:mathematics articles 3016:(e.g., in section " 1024:or in other words: 247:{\displaystyle n=0} 3022:J.P. Martin-Flatin 3009:semigroup algebras 3000:Semigroup Algebras 2982:J.P. 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215: 209: 205: 201: 198: 195: 187: 182: 179: 176: 172: 159: 156: 153: 152: 149: 148: 145: 144: 133: 127: 126: 124: 107:the discussion 94: 93: 77: 65: 64: 56: 44: 43: 37: 26: 13: 10: 9: 6: 4: 3: 2: 3097: 3086: 3083: 3081: 3078: 3077: 3075: 3068: 3067: 3063: 3059: 3046: 3042: 3038: 3034: 3033: 3032: 3031: 3027: 3023: 3019: 3015: 3010: 3006: 2999: 2991: 2987: 2983: 2979: 2975: 2974: 2973: 2972: 2971: 2970: 2965: 2961: 2957: 2953: 2952: 2951: 2950: 2930: 2927: 2924: 2918: 2912: 2909: 2906: 2898: 2895: 2889: 2884: 2880: 2876: 2871: 2867: 2857: 2853: 2852: 2851: 2850: 2843: 2842: 2841: 2840: 2837: 2833: 2829: 2825: 2821: 2818: 2814: 2810: 2793: 2790: 2787: 2764: 2760: 2737: 2733: 2710: 2706: 2685: 2682: 2677: 2673: 2669: 2664: 2660: 2637: 2633: 2623: 2622: 2621: 2620: 2616: 2612: 2608: 2605: 2602: 2599: 2596: 2577: 2573: 2567: 2563: 2559: 2554: 2550: 2544: 2540: 2533: 2530: 2527: 2520: 2504: 2500: 2494: 2490: 2486: 2481: 2477: 2471: 2467: 2463: 2458: 2454: 2448: 2444: 2440: 2435: 2431: 2425: 2421: 2414: 2411: 2408: 2401: 2385: 2381: 2375: 2371: 2367: 2362: 2358: 2352: 2348: 2344: 2339: 2335: 2329: 2325: 2321: 2316: 2312: 2306: 2302: 2298: 2293: 2289: 2283: 2279: 2275: 2270: 2266: 2260: 2256: 2249: 2246: 2243: 2236: 2235: 2234: 2212: 2208: 2202: 2199: 2196: 2191: 2188: 2185: 2181: 2175: 2171: 2167: 2162: 2158: 2152: 2149: 2146: 2141: 2138: 2135: 2131: 2125: 2121: 2112: 2107: 2104: 2101: 2097: 2089: 2088: 2087: 2068: 2064: 2058: 2054: 2050: 2045: 2041: 2035: 2031: 2027: 2022: 2018: 2012: 2008: 2004: 1999: 1995: 1989: 1985: 1981: 1976: 1972: 1966: 1962: 1958: 1953: 1949: 1943: 1939: 1935: 1930: 1926: 1920: 1916: 1909: 1906: 1903: 1896: 1880: 1876: 1870: 1866: 1862: 1857: 1853: 1847: 1843: 1839: 1834: 1830: 1824: 1820: 1816: 1811: 1807: 1801: 1797: 1793: 1788: 1784: 1778: 1774: 1770: 1765: 1761: 1755: 1751: 1744: 1741: 1738: 1731: 1715: 1711: 1705: 1701: 1697: 1692: 1688: 1682: 1678: 1674: 1669: 1665: 1659: 1655: 1651: 1646: 1642: 1636: 1632: 1628: 1623: 1619: 1613: 1609: 1602: 1599: 1596: 1589: 1573: 1569: 1563: 1559: 1555: 1550: 1546: 1540: 1536: 1532: 1527: 1523: 1517: 1513: 1509: 1504: 1500: 1494: 1490: 1483: 1480: 1477: 1470: 1454: 1450: 1444: 1440: 1436: 1431: 1427: 1421: 1417: 1413: 1408: 1404: 1398: 1394: 1387: 1384: 1381: 1374: 1358: 1354: 1348: 1344: 1340: 1335: 1331: 1325: 1321: 1314: 1311: 1308: 1301: 1285: 1281: 1275: 1271: 1264: 1261: 1258: 1251: 1250: 1249: 1230: 1227: 1224: 1220: 1214: 1210: 1204: 1199: 1196: 1193: 1189: 1183: 1178: 1175: 1172: 1168: 1160: 1159: 1158: 1136: 1132: 1128: 1123: 1119: 1115: 1110: 1106: 1102: 1097: 1093: 1081: 1077: 1073: 1068: 1064: 1060: 1055: 1051: 1047: 1042: 1038: 1027: 1026: 1025: 1007: 1001: 997: 991: 986: 983: 980: 976: 971: 967: 963: 957: 953: 947: 942: 939: 936: 932: 927: 919: 918: 917: 914: 911: 908: 905: 902: 899: 898: 896: 892: 889: 888: 886: 881: 880:so I replied 878: 877: 873: 870: 866: 864: 857: 830: 826: 820: 817: 814: 811: 806: 803: 800: 797: 794: 790: 784: 780: 776: 771: 767: 761: 758: 755: 752: 747: 744: 741: 738: 735: 731: 725: 721: 712: 709: 706: 701: 698: 695: 691: 687: 682: 679: 676: 672: 666: 662: 656: 651: 648: 645: 641: 635: 632: 627: 624: 621: 617: 613: 609: 603: 599: 593: 588: 585: 582: 578: 573: 569: 565: 559: 555: 549: 544: 541: 538: 534: 529: 521: 520: 519: 516: 513: 507: 503: 499: 495: 491: 490: 489: 488: 484: 480: 474: 473: 469: 465: 449: 446: 433: 431: 430: 426: 422: 411: 410: 406: 402: 401:85.54.190.251 397: 396: 392: 388: 387:85.54.190.251 370: 366: 343: 339: 335: 312: 309: 306: 299: 291: 288: 272: 269: 266: 262: 241: 238: 235: 213: 207: 199: 196: 180: 177: 174: 170: 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: 3054: 3003: 2855: 2822:I'll ask at 2816: 2609: 2606: 2603: 2600: 2597: 2594: 2232: 2085: 1247: 1156: 1023: 915: 912: 909: 906: 903: 900: 897: 894: 893: 890: 887: 883: 882: 879: 875: 874: 871: 867: 859: 852: 850: 517: 514: 511: 475: 437: 417: 398: 161: 137:Low-priority 136: 96: 62:Low‑priority 40:WikiProjects 3014:Convolution 2859:example of 2611:46.17.97.92 112:Mathematics 103:mathematics 59:Mathematics 30:Start-class 3074:Categories 2806:n}" /: --> 508:Summations 494:Mathmensch 421:MathHisSci 2813:WP:SOURCE 2828:Jowa fan 2783:n}": --> 479:Jowa fan 464:Jowa fan 2845:series. 139:on the 36:scale. 2791:: --> 3062:talk 3041:talk 3037:Taku 3026:talk 2986:talk 2960:talk 2956:Ozob 2832:talk 2752:and 2615:talk 858:and 498:talk 483:talk 468:talk 425:talk 405:talk 391:talk 131:Low 3076:: 3064:) 3043:) 3028:) 2988:) 2980:. 2962:) 2896:βˆ’ 2834:) 2800:n} 2686:β‹― 2617:) 2537:β‡’ 2418:β‡’ 2253:β‡’ 2200:βˆ’ 2182:βˆ‘ 2150:βˆ’ 2132:βˆ‘ 2098:βˆ‘ 1913:β‡’ 1748:β‡’ 1606:β‡’ 1487:β‡’ 1391:β‡’ 1318:β‡’ 1268:β‡’ 1228:βˆ’ 1190:βˆ‘ 1169:βˆ‘ 977:βˆ‘ 968:β‹… 933:βˆ‘ 818:βˆ’ 791:βˆ‘ 759:βˆ’ 732:βˆ‘ 710:βˆ’ 692:βˆ‘ 688:βˆ’ 680:βˆ’ 642:βˆ‘ 618:βˆ‘ 579:βˆ‘ 570:β‹… 535:βˆ‘ 500:) 485:) 470:) 447:βˆ‘ 427:) 407:) 393:) 336:βˆ‘ 289:βˆ’ 278:∞ 263:βˆ‘ 197:βˆ’ 186:∞ 171:βˆ‘ 3060:( 3039:( 3024:( 2984:( 2958:( 2945:. 2931:1 2928:+ 2925:n 2919:/ 2913:1 2910:+ 2907:n 2903:) 2899:1 2893:( 2890:= 2885:n 2881:b 2877:= 2872:n 2868:a 2856:n 2830:( 2808:. 2794:n 2788:k 2765:k 2761:b 2738:k 2734:a 2711:n 2707:c 2683:+ 2678:2 2674:c 2670:+ 2665:1 2661:c 2638:n 2634:c 2613:( 2578:4 2574:a 2568:2 2564:b 2560:+ 2555:4 2551:b 2545:2 2541:a 2534:2 2531:= 2528:k 2505:5 2501:a 2495:1 2491:b 2487:+ 2482:4 2478:a 2472:1 2468:b 2464:+ 2459:5 2455:b 2449:1 2445:a 2441:+ 2436:4 2432:b 2426:1 2422:a 2415:1 2412:= 2409:k 2386:6 2382:a 2376:0 2372:b 2368:+ 2363:5 2359:a 2353:0 2349:b 2345:+ 2340:4 2336:a 2330:0 2326:b 2322:+ 2317:6 2313:b 2307:0 2303:a 2299:+ 2294:5 2290:b 2284:0 2280:a 2276:+ 2271:4 2267:b 2261:0 2257:a 2250:0 2247:= 2244:k 2218:) 2213:i 2209:a 2203:k 2197:6 2192:4 2189:= 2186:i 2176:k 2172:b 2168:+ 2163:i 2159:b 2153:k 2147:6 2142:4 2139:= 2136:i 2126:k 2122:a 2118:( 2113:2 2108:0 2105:= 2102:k 2069:0 2065:b 2059:6 2055:a 2051:+ 2046:1 2042:b 2036:5 2032:a 2028:+ 2023:2 2019:b 2013:4 2009:a 2005:+ 2000:3 1996:b 1990:3 1986:a 1982:+ 1977:4 1973:b 1967:2 1963:a 1959:+ 1954:5 1950:b 1944:1 1940:a 1936:+ 1931:6 1927:b 1921:0 1917:a 1910:6 1907:= 1904:k 1881:0 1877:b 1871:5 1867:a 1863:+ 1858:1 1854:b 1848:4 1844:a 1840:+ 1835:2 1831:b 1825:3 1821:a 1817:+ 1812:3 1808:b 1802:2 1798:a 1794:+ 1789:4 1785:b 1779:1 1775:a 1771:+ 1766:5 1762:b 1756:0 1752:a 1745:5 1742:= 1739:k 1716:0 1712:b 1706:4 1702:a 1698:+ 1693:1 1689:b 1683:3 1679:a 1675:+ 1670:2 1666:b 1660:2 1656:a 1652:+ 1647:3 1643:b 1637:1 1633:a 1629:+ 1624:4 1620:b 1614:0 1610:a 1603:4 1600:= 1597:k 1574:0 1570:b 1564:3 1560:a 1556:+ 1551:1 1547:b 1541:2 1537:a 1533:+ 1528:2 1524:b 1518:1 1514:a 1510:+ 1505:3 1501:b 1495:0 1491:a 1484:3 1481:= 1478:k 1455:0 1451:b 1445:2 1441:a 1437:+ 1432:1 1428:b 1422:1 1418:a 1414:+ 1409:2 1405:b 1399:0 1395:a 1388:2 1385:= 1382:k 1359:0 1355:b 1349:1 1345:a 1341:+ 1336:1 1332:b 1326:0 1322:a 1315:1 1312:= 1309:k 1286:0 1282:b 1276:0 1272:a 1265:0 1262:= 1259:k 1231:i 1225:k 1221:b 1215:i 1211:a 1205:k 1200:0 1197:= 1194:i 1184:6 1179:0 1176:= 1173:k 1142:) 1137:3 1133:b 1129:+ 1124:2 1120:b 1116:+ 1111:1 1107:b 1103:+ 1098:0 1094:b 1090:( 1087:) 1082:3 1078:a 1074:+ 1069:2 1065:a 1061:+ 1056:1 1052:a 1048:+ 1043:0 1039:a 1035:( 1008:) 1002:k 998:b 992:3 987:0 984:= 981:k 972:( 964:) 958:k 954:a 948:3 943:0 940:= 937:k 928:( 862:k 860:b 855:k 853:a 836:) 831:i 827:a 821:k 815:n 812:2 807:1 804:+ 801:n 798:= 795:i 785:k 781:b 777:+ 772:i 768:b 762:k 756:n 753:2 748:1 745:+ 742:n 739:= 736:i 726:k 722:a 718:( 713:1 707:n 702:0 699:= 696:k 683:i 677:k 673:b 667:i 663:a 657:k 652:0 649:= 646:i 636:n 633:2 628:0 625:= 622:k 614:= 610:) 604:k 600:b 594:n 589:0 586:= 583:k 574:( 566:) 560:k 556:a 550:n 545:0 542:= 539:k 530:( 496:( 481:( 466:( 450:x 423:( 403:( 389:( 371:n 367:b 344:n 340:b 313:1 310:+ 307:n 300:n 296:) 292:1 286:( 273:0 270:= 267:n 242:0 239:= 236:n 214:n 208:n 204:) 200:1 194:( 181:0 178:= 175:n 143:. 42::

Index


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project's priority scale
85.54.190.251
talk
12:38, 22 January 2011 (UTC)
85.54.190.251
talk
12:46, 22 January 2011 (UTC)
MathHisSci
talk
12:15, 15 March 2010 (UTC)
Jowa fan
talk
02:51, 28 April 2011 (UTC)
Jowa fan
talk
02:16, 30 April 2011 (UTC)
Mathmensch
talk

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