Timeline for Representability of flat cohomology by a group scheme
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 4, 2021 at 5:57 | comment | added | David Benjamin Lim | @naf Sorry was a little busy recently. I have just emailed you. | |
| May 4, 2021 at 4:14 | comment | added | naf | I deleted my email after keeping it here for a week. In case you didn't see it you can ping me here. | |
| Apr 27, 2021 at 4:16 | history | edited | David Benjamin Lim | CC BY-SA 4.0 |
added 20 characters in body
|
| Apr 26, 2021 at 12:17 | comment | added | David Benjamin Lim | @naf Would you like to continue this correspondence over email? How can I reach you? | |
| Apr 26, 2021 at 11:04 | comment | added | naf | I started reading the proof, but got confused: at the bottom of p. 8 they define a map $\chi$ which they use to get a presentation of the sheaf $R^2 \pi_* \mu_p$. However, there seems to be no statement about the surjectivity of this map so I don't see how this works. One has to perhaps use that the fibres are surfaces and de Jong's theorem saying that the period is equal to the index, but nothing is said about this in the paper. | |
| Apr 26, 2021 at 1:09 | comment | added | naf | Thanks. Artin does not assume that $X$ is a K3, so I was hoping more general results would be known, but this reference looks like a good starting point. | |
| Apr 25, 2021 at 12:47 | history | edited | David Benjamin Lim | CC BY-SA 4.0 |
added 11 characters in body
|
| Apr 25, 2021 at 12:42 | history | answered | David Benjamin Lim | CC BY-SA 4.0 |