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 Showing results 1 to 25 of 195 Search took 0.04 seconds. Search: Posts Made By: Kees
 Forum: Lounge 2009-08-31, 07:48 Replies: 28 Views: 1,806 Posted By Kees V-E+F=2 V-E+F=2
 Forum: Puzzles 2009-05-07, 15:24 Replies: 16 Views: 984 Posted By Kees One example for 7 lines on a 8x8 square: 7 1... One example for 7 lines on a 8x8 square: 7 1 1 2 2 3 4 4 7 1 2 2 3 3 4 5 1 1 2 3 3 4 4 5 1 2 2 3 4 4 5 5 1 2 3 3 4 5 5 6 2 2 3 4 4 5 6 6 2 3 3 4 5 5 6 7 2 3 4 4 5 6 6 7
 Forum: Puzzles 2009-05-05, 16:15 Replies: 16 Views: 984 Posted By Kees Lines in a Square Consider an n x n chessboard. What is the size of the smallest collection of lines such that every square of the chessboard is intersected by at least one line ? PS: I do not pretend to have a...
 Forum: Puzzles 2009-04-27, 15:49 Replies: 33 Views: 1,706 Posted By Kees http://arxiv.org/abs/0904.1757 http://arxiv.org/abs/0904.1757
 Forum: Puzzles 2009-04-24, 15:09 Replies: 33 Views: 1,706 Posted By Kees Start with small dimension (n=3, n=4) For... Start with small dimension (n=3, n=4) For n=3 we get a resistance of 1/3 + 1/6 + 1/3 = 5/6 For n=4 we get a resistance of 1/4 + 1/12 + 1/12 + 1/4= 2/3
 Forum: Puzzles 2009-01-26, 10:46 Replies: 22 Views: 1,154 Posted By Kees 8/(3-8/3)=24 8/(3-8/3)=24
 Forum: Math 2008-11-07, 14:29 Replies: 3 Views: 486 Posted By Kees Obviously, we can write \prod_{1\le j
 Forum: Math 2008-11-07, 12:11 Replies: 3 Views: 486 Posted By Kees Looking for an elementary demonstration a_1,\ldots,a_n are integers, all different. It is possible to prove that \prod_{i< j}(i-j) |\prod_{i
 Forum: Lounge 2008-05-27, 12:26 Replies: 5 Views: 630 Posted By Kees Well, memorable or not, he signs his messages as... Well, memorable or not, he signs his messages as Jacob...
 Forum: PrimeNet 2008-05-07, 12:22 Replies: 311 Views: 16,897 Posted By Kees I miss the old stats page too I miss the old stats page too
 Forum: Lounge 2008-03-27, 09:15 Replies: 75 Views: 3,093 Posted By Kees Strasbourg, France Strasbourg, France
 Forum: Puzzles 2008-03-20, 11:32 Replies: 20 Views: 884 Posted By Kees http://www.scanraid.com/sudoku.htm http://www.scanraid.com/sudoku.htm
 Forum: Math 2008-03-06, 09:58 Replies: 15 Views: 1,441 Posted By Kees well, 43 obviously which makes it very... well, 43 obviously which makes it very uninteresting indeed
 Forum: Math 2008-03-06, 09:14 Replies: 15 Views: 1,441 Posted By Kees I thought it was 37 I thought it was 37
 Forum: Puzzles 2008-02-13, 15:47 Replies: 23 Views: 1,012 Posted By Kees An interesting link, slightly related ... An interesting link, slightly related http://www.maa.org/mathland/mathland_5_19.html
 Forum: Puzzles 2008-01-29, 09:29 Replies: 54 Views: 1,948 Posted By Kees So for coordinate users: White: Ke1, c4 ... So for coordinate users: White: Ke1, c4 Black: Ke8 Is this the problem you have in mind ?
 Forum: Chess 2008-01-18, 12:16 Replies: 42 Views: 2,524 Posted By Kees Chess loses a legend Bobby Fischer has passed away
 Forum: Lounge 2007-11-26, 10:43 Replies: 289 Views: 11,362 Posted By Kees I seem to remmeebr a smilair seeht but the frist... I seem to remmeebr a smilair seeht but the frist and the lsat lteter raeimned in the smae pcale
 Forum: Puzzles 2007-11-14, 07:23 Replies: 14 Views: 789 Posted By Kees I get to 35 too as upperbound but I would be... I get to 35 too as upperbound but I would be surprised if there were a configuration where 35 moves are actually needed
 Forum: Puzzles 2007-11-13, 16:01 Replies: 14 Views: 789 Posted By Kees 1) numbers are randomly placed 2) exchange... 1) numbers are randomly placed 2) exchange between any two numbers is possible, not just adjacently placed numbers 3) final result applies to adjacent numbers
 Forum: Puzzles 2007-11-13, 15:22 Replies: 14 Views: 789 Posted By Kees Composite checkerboard The numbers 1,2,...,100 are written in cells of a table 10 x 10, each number is written once. By one move, we may interchange numbers in any two cells. After how many moves may we get a table, in...
 Forum: Homework Help 2007-11-12, 14:12 Replies: 10 Views: 827 Posted By Kees actually, I am not sure whether it would fall... actually, I am not sure whether it would fall under rule 3 "overt answer". Would "overt" mean that when the response given is handed in as homework answer, the homeworkee receives at least 80 % of...
 Forum: Homework Help 2007-11-12, 14:07 Replies: 10 Views: 827 Posted By Kees sorry, could not hide with TeX sorry, could not hide with TeX
 Forum: Homework Help 2007-11-12, 13:35 Replies: 10 Views: 827 Posted By Kees A_{n+1}=A_n-\frac{1}{n+1}+\frac{1}{2n+1}+\frac{1}{... A_{n+1}=A_n-\frac{1}{n+1}+\frac{1}{2n+1}+\frac{1}{2n+2}\\ =A_n+\frac{1}{2n+1}-\frac{1}{2n+2}=\\ \sum_{i=1}^{n+1}\frac{(-1)^{i+1}}{i}\\ \lim_{n\rightarrow\infty}A_n=\log 2 with the last by...
 Forum: Lounge 2007-10-26, 09:17 Replies: 215 Views: 12,927 Posted By Kees well, it was meant to be the question but... well, it was meant to be the question but clearly, I should have written something less cryptic
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