Timeline for Are open orientable 3-manifolds parallelizable via obstruction theory?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 31, 2018 at 11:31 | comment | added | Tom Goodwillie | Universal coefficient theorem for field coefficients: cohomology is the vector space dual of homology. | |
| Mar 31, 2018 at 11:30 | comment | added | Tom Goodwillie | Every compact set in a smooth connected manifold is contained in some compact connected submanifold. | |
| Mar 31, 2018 at 11:28 | comment | added | Michael Albanese | Why does $w_2$ restrict to zero on a compact set? Isn't this only true for compact submanifolds? | |
| Mar 31, 2018 at 2:43 | comment | added | Andy Putman | @user6419: You might be interested in the cautionary example here: mathoverflow.net/a/140131/317 | |
| Mar 31, 2018 at 2:02 | vote | accept | user6419 | ||
| Mar 31, 2018 at 2:02 | comment | added | user6419 | Never mind, I think this is just universal coefficient theorem, and you really meant finite fields. | |
| Mar 31, 2018 at 1:47 | comment | added | user6419 | Thank you! Do you have a reference for field coefficients vs integral? | |
| Mar 31, 2018 at 1:40 | history | answered | Tom Goodwillie | CC BY-SA 3.0 |