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Sep 8, 2013 at 16:37 comment added Wlodek Kuperberg Unsuccessful attempts at inductive proofs of Brouwer's fixed point theorem lead to such surprising counterexamples.
Sep 8, 2013 at 6:37 comment added Misha Thank you, Wlodek: hard to believe that such thing is possible...
Sep 7, 2013 at 17:13 history answered Wlodek Kuperberg CC BY-SA 3.0