Timeline for Closed manifolds are not absolute retracts?
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 16, 2021 at 12:23 | vote | accept | mathieu | ||
| Mar 15, 2021 at 17:48 | comment | added | M.G. | @mathieu: Yes, every closed topological manifold is $\mathbb{Z}/2\mathbb{Z}$-orientable. For example, you can find the result and its proof in Hatcher's book, p.235 in 2nd ed. | |
| Mar 15, 2021 at 12:07 | comment | added | mathieu | Thank you! I see here that $H_n(M; \mathbb{Z}_2)=\mathbb{Z}_2$. | |
| Mar 15, 2021 at 11:19 | history | answered | Alessandro Codenotti | CC BY-SA 4.0 |