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Sep 26, 2021 at 17:51 history made wiki Post Made Community Wiki by Stefan Kohl
May 10, 2016 at 5:49 comment added HJRW This is one of my favourite examples, but again it's not purely group-theoretic. Markov had to be careful to ensure that the simply-connected manifolds he constructed were homeomorphic. (These days it's easier using Freedman, but that's an even bigger topological hammer!)
May 9, 2016 at 17:13 history answered Steve Huntsman CC BY-SA 3.0