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Sep 30 '10 at 15:11 comment added Dylan Wilson Excellent! This is all crazy cool... A different flavor of algebraic topology than the "apply a functor to show your desired construction doesn't exist" type. Thanks!
Sep 30 '10 at 6:56 history edited Christian Nassau CC BY-SA 2.5
added 108 characters in body
Sep 30 '10 at 6:50 history edited Christian Nassau CC BY-SA 2.5
corrected a mistake
Sep 30 '10 at 6:20 history answered Christian Nassau CC BY-SA 2.5