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Sep 15, 2020 at 19:17 vote accept Steve
Sep 15, 2020 at 14:32 history edited Ian Agol CC BY-SA 4.0
added 117 characters in body
Sep 15, 2020 at 14:24 comment added Ian Agol Good point, that’s what I meant, but didn’t write it correctly. I’ll fix it. Thanks.
Sep 15, 2020 at 14:23 comment added Brian Shin just to clarify: when you say "crush the Hopf link", I think you mean individually crush each $S^1$ to a point, right?
Sep 15, 2020 at 4:02 history answered Ian Agol CC BY-SA 4.0