Timeline for Automorphism group of a scheme
Current License: CC BY-SA 2.5
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 18, 2017 at 15:52 | comment | added | Zhiyu | How does the action of $Aut^∘(X)$ (in this case) exhibits $X$ as a uniruled variety ? | |
| Feb 21, 2011 at 12:46 | comment | added | THC | Dear Sandor, very informative ! Can you say a word about "and hence it inherits a natural scheme structure" ? (Why this is when dealing with a subgroup quotient ?) I think the finiteness outcome is not an obstruction for me, since eventually my automorphism schemes will look like Chevalley group schemes ... | |
| Feb 20, 2011 at 12:14 | comment | added | Arend Bayer | Of course, Sándor's answer explains much more, but it's also worth pointing out that on an elliptic curve $E$, there is no $\mathrm{Aut} E$-invariant line bundle. Hence for every embedding of $E$ into projective space, almost all automorphisms do not extend to projective space. | |
| Feb 20, 2011 at 10:50 | history | answered | Sándor Kovács | CC BY-SA 2.5 |