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 wu :: forums    riddles    putnam exam (pure math) (Moderators: Grimbal, towr, SMQ, Icarus, Eigenray, william wu)
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 Subject Started by Replies Views Last post double integral hparty 11 9065 Aug 9th, 2010, 7:15pmby Michael Dagg about matrix approximation cuckoo 1 7918 Aug 9th, 2010, 12:00pmby william wu Expected length of longest increasing subsequence Eigenray 14 11354 Mar 30th, 2009, 11:15pmby Eigenray Problem with a square x2862 4 5610 Mar 24th, 2010, 5:57pmby Aryabhatta Palindrome dsd 1 1566 Mar 8th, 2010, 2:03amby N/A Scalable but not additive functions mistaken_id 8 5565 Feb 3rd, 2010, 5:12amby Grimbal Reciprocal Product Summation Aryabhatta 4 3681 Sep 14th, 2009, 5:30pmby Eigenray Det of sum of permutation matrices Eigenray 8 6234 Sep 13th, 2009, 5:14pmby Eigenray Moved: Puzzle: Who gets larger salary? balki 0 1699 Sep 10th, 2009, 7:40amby balki x_(n+1) = sin(x_n) Aryabhatta 7 15472 Jul 28th, 2009, 8:48pmby Aryabhatta Altitudes of Triangle ThudnBlunder 6 1540 Jul 28th, 2009, 6:56amby ThudnBlunder Integral with reciprocal of log x. Aryabhatta 5 4864 Jul 27th, 2009, 12:19pmby Aryabhatta Color positive integers Obob 12 2228 Jul 26th, 2009, 7:34pmby Michael Dagg All n^th derivate at 0 are integers Aryabhatta 5 2297 Jul 20th, 2009, 1:06pmby Eigenray Isomorphism between groups knightfischer 5 4313 Jun 9th, 2009, 5:21pmby Eigenray Moved: Probabilities... hendrik 0 947 May 4th, 2009, 9:44amby hendrik Have you seen this kind of matrix? cuckoo 6 1279 Mar 27th, 2009, 11:33pmby Eigenray Expected maximum value in [0,1] mistaken_id 5 2094 Mar 19th, 2009, 10:36amby Obob f(n) | 2^n - 1 Eigenray 8 1398 Mar 15th, 2009, 4:47pmby Obob Non trivial BST Insertion howard roark 15 1513 Mar 2nd, 2009, 10:23pmby Eigenray Miracle on three point street ecoist 6 981 Feb 7th, 2009, 10:52pmby Ronno Euler phi is DFT of GCD Eigenray 5 2271 Jan 30th, 2009, 12:42pmby balakrishnan Pulling Names Out Of A Hat ThudnBlunder 1 1171 Jan 30th, 2009, 10:52amby balakrishnan Fellow Travellers ThudnBlunder 3 1817 Jan 27th, 2009, 1:58pmby Grimbal Re: Expected number howard roark 5 1050 Jan 22nd, 2009, 2:26pmby towr Combinatorial Sum ThudnBlunder 2 1585 Jan 20th, 2009, 8:45amby pex Relative probability howard roark 1 14459 Jan 14th, 2009, 6:35pmby teekyman Mirroring Continued Fractions Barukh 3 1180 Dec 23rd, 2008, 11:38pmby Eigenray Independent? archau 3 1082 Dec 16th, 2008, 10:41pmby archau Convergent or Divergent? ThudnBlunder 3 2172 Dec 15th, 2008, 7:21pmby ThudnBlunder
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