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Nov 12, 2011 at 19:12 vote accept Valerio Capraro
Jun 10, 2011 at 22:00 comment added Gerhard Paseman Actually, the original poster seems to have confirmed that he understood your answer, which is not quite the same as understanding the question. I like it as an answer though, given my limited understanding of both question and answer. (I hope (possibly trivial) means make sense for arbitrary binary operations.) Gerhard "Understands Understanding Is Oft Misunderstood" Paseman, 2011.06.10
Jun 10, 2011 at 21:48 history answered darij grinberg CC BY-SA 3.0