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Timeline for Example of an unnatural isomorphism

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Aug 15, 2013 at 2:11 history made wiki Post Made Community Wiki by Ben Webster
Aug 14, 2013 at 10:43 vote accept Bugs Bunny
Aug 14, 2013 at 10:43 comment added Bugs Bunny That is very cool!
Aug 14, 2013 at 8:38 comment added Jeremy Rickard True. Either will do.
Aug 14, 2013 at 8:35 comment added Qiaochu Yuan What you've written doesn't uniquely define a category. There are two such categories: either the non-identity morphism $f$ satisfies $f^2 = \text{id}$ or it satisfies $f^2 = f$.
Aug 14, 2013 at 8:25 history answered Jeremy Rickard CC BY-SA 3.0