Timeline for Is $\mathbb{CP}^3$ minus two points the universal cover of a compact manifold?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| S Apr 1, 2022 at 10:06 | history | suggested | Daniel Asimov | CC BY-SA 4.0 |
"the universal covering" —> "the universal cover of a compact manifold"
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| Mar 31, 2022 at 22:37 | review | Suggested edits | |||
| S Apr 1, 2022 at 10:06 | |||||
| Mar 31, 2022 at 16:41 | vote | accept | Nick L | ||
| Mar 31, 2022 at 15:07 | answer | added | Vitali Kapovitch | timeline score: 35 | |
| Mar 31, 2022 at 14:04 | comment | added | HJRW | One simple observation is that, since the number of (Freudenthal) ends is an invariant of the fundamental group, if so then $\pi_1(M)$ has two ends, from which it follows that it has a finite-index subgroup isomorphic to $\mathbb{Z}$. Passing to the corresponding finite-sheeted cover, you may as well assume that $\pi_1(M)\cong\mathbb{Z}$. | |
| Mar 31, 2022 at 12:49 | history | asked | Nick L | CC BY-SA 4.0 |