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N Is a Number: A Portrait of Paul Erdős is a 1993 documentary directed by George Paul Csicsery about the life of mathematician Paul Erdős. Paul Erdős (26 March 1913 -- 20 September 1996) was a Hungarian mathematician. Erdős published more papers than any other mathematician in history, working with hundreds of collaborators. He worked on problems in combinatorics, graph theory, number theory, classical analysis, approximation theory, set theory, and probability theory. He is also known for his "legendarily eccentric" personality. (Previously he was mostly a number)

posted by Obscure Reference on Sep 14, 2012 - 19 comments

posted by Obscure Reference on Sep 14, 2012 - 19 comments

Geometrically the irrationality of the square root of 2 means that there is no integer-by-integer square whose area is twice the area of another integer-by-integer square. A visual proof that the square root of 2 is irrational (not found in previous visual proof post.)

posted by Obscure Reference on May 9, 2012 - 39 comments

posted by Obscure Reference on May 9, 2012 - 39 comments

What is the minimal number of clues necessary to create a uniquely solvable Sudoku puzzle? It turns out to be 17, though it took fancy symmetry arguments and nearly a year of computer time to prove it. But no need to read the paper when you can watch the video.

posted by Obscure Reference on Mar 14, 2012 - 54 comments

posted by Obscure Reference on Mar 14, 2012 - 54 comments

posted by Obscure Reference on Aug 27, 2011 - 42 comments

Vortex-based mathematics is the most advanced ever known to mankind. Don't have time for a time cube? Time need no longer limit us. Here, Marco Rodin (inventor of the Rodin Coil) gives us the background.

posted by Obscure Reference on Apr 27, 2011 - 45 comments

posted by Obscure Reference on Apr 27, 2011 - 45 comments

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