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Oct 27, 2021 at 5:17 history became hot network question
Oct 26, 2021 at 23:15 vote accept RBega2
Oct 26, 2021 at 23:15 history edited RBega2 CC BY-SA 4.0
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Oct 26, 2021 at 21:49 answer added Anubhav Mukherjee timeline score: 18
Oct 26, 2021 at 21:36 comment added Ryan Budney For your last point, you can argue $X$ must be simply-connected by using $X$ in a computation of the fundamental group of $S^n$, so it is contractible. This avoids Brown-Mazur.
Oct 26, 2021 at 21:11 history asked RBega2 CC BY-SA 4.0