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wu :: forums    riddles    putnam exam (pure math) (Moderators: william wu, Eigenray, SMQ, Icarus, towr) requires some formal math training to understand Pages: 1 2 3  ...  15 Start new topic    Subject Started by Replies Views Last post Putnam Contest Archive Yournamehere 6 4133 Jun 9th, 2008, 6:48am by Eigenray Zero? kyle1080 10 225 Nov 25th, 2009, 5:28pm by kyle1080 Floor Summation ThudanBlunder 3 64 Nov 11th, 2009, 6:10am by Obob Integral of a factorial function howard roark 3 349 Nov 5th, 2009, 9:25am by Henk Integers as sums of two squares Michael Dagg 4 363 Oct 4th, 2009, 3:07pm by Michael Dagg A linear algebra upper bound. acarchau 2 165 Sep 15th, 2009, 5:44pm by acarchau Reciprocal Product Summation Aryabhatta 4 236 Sep 14th, 2009, 5:30pm by Eigenray Det of sum of permutation matrices Eigenray 8 279 Sep 13th, 2009, 5:14pm by Eigenray Proof by Mathematical Induction daemonturk 1 80 Sep 12th, 2009, 10:42am by towr Moved: Puzzle: Who gets larger salary? balki 0 64 Sep 10th, 2009, 7:40am by balki A High School level Problem (Interesting) daemonturk 6 148 Sep 1st, 2009, 4:21am by daemonturk x_(n+1) = sin(x_n) Aryabhatta 7 145 Jul 28th, 2009, 8:48pm by Aryabhatta Altitudes of Triangle ThudanBlunder 6 114 Jul 28th, 2009, 6:56am by ThudanBlunder Integral with reciprocal of log x. Aryabhatta 5 161 Jul 27th, 2009, 12:19pm by Aryabhatta Color positive integers Obob 12 334 Jul 26th, 2009, 7:34pm by Michael Dagg All n^th derivate at 0 are integers Aryabhatta 5 139 Jul 20th, 2009, 1:06pm by Eigenray Isomorphism between groups knightfischer 5 168 Jun 9th, 2009, 5:21pm by Eigenray Moved: Probabilities... hendrik 0 163 May 4th, 2009, 9:44am by hendrik about matrix approximation cuckoo 0 186 Apr 5th, 2009, 9:07am by cuckoo Expected length of longest increasing subsequence Eigenray 14 468 Mar 30th, 2009, 11:15pm by Eigenray Have you seen this kind of matrix? cuckoo 6 313 Mar 27th, 2009, 11:33pm by Eigenray Expected maximum value in [0,1] mistaken_id 5 303 Mar 19th, 2009, 10:36am by Obob f(n) | 2^n - 1 Eigenray 8 806 Mar 15th, 2009, 4:47pm by Obob Non trivial BST Insertion howard roark 15 465 Mar 2nd, 2009, 10:23pm by Eigenray Miracle on three point street ecoist 6 368 Feb 7th, 2009, 10:52pm by Ronno Euler phi is DFT of GCD Eigenray 5 463 Jan 30th, 2009, 12:42pm by balakrishnan Pulling Names Out Of A Hat ThudanBlunder 1 279 Jan 30th, 2009, 10:52am by balakrishnan Fellow Travellers ThudanBlunder 3 338 Jan 27th, 2009, 1:58pm by Grimbal Re: Expected number howard roark 5 364 Jan 22nd, 2009, 2:26pm by towr Combinatorial Sum ThudanBlunder 2 347 Jan 20th, 2009, 8:45am by pex Pages: 1 2 3  ...  15 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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