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when toggle format what by license comment
Mar 29, 2012 at 15:23 comment added Igor Rivin This is in every elementary textbook (AND you can do the computation yourself) so I would not call this a research level question. Voting to close.
Mar 29, 2012 at 15:20 answer added David Feldman timeline score: 1
Mar 29, 2012 at 15:04 history asked Aly CC BY-SA 3.0