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May 24, 2012 at 8:21 history edited hbm CC BY-SA 3.0
added 32 characters in body
May 22, 2012 at 23:02 history edited Gerry Myerson CC BY-SA 3.0
fixed typo in title
May 22, 2012 at 22:59 answer added Steven Landsburg timeline score: 1
May 22, 2012 at 18:58 comment added Gjergji Zaimi Isn't this just the condition you get from Hall's theorem?
May 22, 2012 at 18:38 history asked hbm CC BY-SA 3.0