Timeline for Is the theta characteristic attached to an etale double cover of a plane quintic arising from a cubic threefold even in characteristic two?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 5, 2022 at 11:46 | vote | accept | TCiur | ||
| Aug 1, 2022 at 15:45 | answer | added | Will Sawin | timeline score: 2 | |
| Aug 1, 2022 at 10:16 | comment | added | TCiur | @WillSawin How would one produce an upper bound of $4$ in characteristic $2$? I think that would be enough to solve all my problems. In this case it doesn't hold that $\pi_*\pi^*H = H + H(\eta)$ | |
| Jul 27, 2022 at 12:11 | comment | added | TCiur | @abx I edited the question. I am interested in the case where $\pi$ comes from a conic bundle structure on a cubic threefold. I would probably have to use the geometry of the cubic threefold then. | |
| Jul 27, 2022 at 12:08 | history | edited | TCiur | CC BY-SA 4.0 |
added 213 characters in body; edited title
|
| Jul 27, 2022 at 11:47 | comment | added | Will Sawin | It seems likely that the possible values in characteristic $2$ are also $3$ or $4$, with $3$ generic. | |
| Jul 26, 2022 at 18:37 | comment | added | abx | Even in characteristic 0, $h^0(M)$ depends on the choice of $\pi$ — it can be 3 or 4. | |
| Jul 26, 2022 at 17:29 | history | asked | TCiur | CC BY-SA 4.0 |