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Feb 1, 2021 at 1:20 comment added Ben Webster I would argue on the merits that it is a MathOverflow question. It might have a simple answer, but it requires a knowledge of graduate level algebraic topology to even understand the statement of the question.
Jan 29, 2021 at 20:27 review Close votes
Feb 1, 2021 at 6:49
Jan 29, 2021 at 4:19 comment added mme This is in Hatcher's notes on 3-manifolds, which is well worth the quick read. No need for geometry.
Jan 29, 2021 at 2:41 history became hot network question
Jan 28, 2021 at 20:49 vote accept Ethan Dlugie
Jan 28, 2021 at 19:13 answer added Marco Golla timeline score: 13
Jan 28, 2021 at 19:10 answer added Achim Krause timeline score: 7
Jan 28, 2021 at 19:04 history edited Ethan Dlugie CC BY-SA 4.0
Take into account easy counterexample offered by commenter
Jan 28, 2021 at 19:01 comment added Ethan Dlugie Right you are, I guess I didn't think about that too carefully. Let's see if I can edit to ask a better question.
Jan 28, 2021 at 18:55 comment added Matt Zaremsky Wait, isn't a 3-sphere a counterexample?
Jan 28, 2021 at 18:38 history asked Ethan Dlugie CC BY-SA 4.0