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wu :: forums    riddles    putnam exam (pure math) (Moderators: william wu, Eigenray, towr, Grimbal, Icarus, SMQ) requires some formal math training to understand Pages: 1 2 3 4  ...  16 Start new topic    Subject Started by Replies Views Last post double integral hparty 11 9112 Aug 9th, 2010, 7:15pm by Michael Dagg about matrix approximation cuckoo 1 7953 Aug 9th, 2010, 12:00pm by william wu Expected length of longest increasing subsequence Eigenray 14 11449 Mar 30th, 2009, 11:15pm by Eigenray Problem with a square x2862 4 5635 Mar 24th, 2010, 5:57pm by Aryabhatta Palindrome dsd 1 1612 Mar 8th, 2010, 2:03am by N/A Scalable but not additive functions mistaken_id 8 5623 Feb 3rd, 2010, 5:12am by Grimbal Reciprocal Product Summation Aryabhatta 4 3707 Sep 14th, 2009, 5:30pm by Eigenray Det of sum of permutation matrices Eigenray 8 6306 Sep 13th, 2009, 5:14pm by Eigenray Moved: Puzzle: Who gets larger salary? balki 0 1713 Sep 10th, 2009, 7:40am by balki x_(n+1) = sin(x_n) Aryabhatta 7 15553 Jul 28th, 2009, 8:48pm by Aryabhatta Altitudes of Triangle ThudnBlunder 6 1601 Jul 28th, 2009, 6:56am by ThudnBlunder Integral with reciprocal of log x. Aryabhatta 5 4890 Jul 27th, 2009, 12:19pm by Aryabhatta Color positive integers Obob 12 2255 Jul 26th, 2009, 7:34pm by Michael Dagg All n^th derivate at 0 are integers Aryabhatta 5 2325 Jul 20th, 2009, 1:06pm by Eigenray Isomorphism between groups knightfischer 5 4368 Jun 9th, 2009, 5:21pm by Eigenray Moved: Probabilities... hendrik 0 969 May 4th, 2009, 9:44am by hendrik Have you seen this kind of matrix? cuckoo 6 1311 Mar 27th, 2009, 11:33pm by Eigenray Expected maximum value in [0,1] mistaken_id 5 2117 Mar 19th, 2009, 10:36am by Obob f(n) | 2^n - 1 Eigenray 8 1414 Mar 15th, 2009, 4:47pm by Obob Non trivial BST Insertion howard roark 15 1555 Mar 2nd, 2009, 10:23pm by Eigenray Miracle on three point street ecoist 6 992 Feb 7th, 2009, 10:52pm by Ronno Euler phi is DFT of GCD Eigenray 5 2304 Jan 30th, 2009, 12:42pm by balakrishnan Pulling Names Out Of A Hat ThudnBlunder 1 1203 Jan 30th, 2009, 10:52am by balakrishnan Fellow Travellers ThudnBlunder 3 1858 Jan 27th, 2009, 1:58pm by Grimbal Re: Expected number howard roark 5 1067 Jan 22nd, 2009, 2:26pm by towr Combinatorial Sum ThudnBlunder 2 1609 Jan 20th, 2009, 8:45am by pex Relative probability howard roark 1 14729 Jan 14th, 2009, 6:35pm by teekyman Mirroring Continued Fractions Barukh 3 1200 Dec 23rd, 2008, 11:38pm by Eigenray Independent? archau 3 1099 Dec 16th, 2008, 10:41pm by archau Convergent or Divergent? ThudnBlunder 3 2198 Dec 15th, 2008, 7:21pm by ThudnBlunder Pages: 1 2 3 4  ...  16 Start new topic  Normal Topic Hot Topic (More than 15 Replies) Very Hot Topic (More than 25 Replies) Locked Topic Sticky Topic Sticky Locked Topic Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs => putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese

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