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Nov 17, 2009 at 1:56 history edited Reid Barton CC BY-SA 2.5
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Nov 17, 2009 at 1:53 comment added Reid Barton A is not cocommutative, which was one of the assumptions.
Nov 16, 2009 at 19:11 vote accept Eric Wofsey
Nov 17, 2009 at 2:30
Nov 16, 2009 at 17:37 history answered Mariano Suárez-Álvarez CC BY-SA 2.5