Timeline for why do automorphisms preserve ample divisors?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 22, 2014 at 22:42 | comment | added | Will Sawin | Is there really an example among cubic plane curves? Shouldn't they all have $H^2(X,\mathbb Z)=\mathbb Z$? | |
| Mar 6, 2014 at 16:46 | comment | added | abx | Yes, same argument. The exceptions are : curves $(2,2)$ in $\mathbb{P}^3$, surfaces $(2,3)$ in $\mathbb{P}^4$ and $(2,2,2)$ in $\mathbb{P}^5$. | |
| Mar 6, 2014 at 16:16 | comment | added | beginigeb | Thanks! Is this also true for smooth complete intersections? | |
| Mar 6, 2014 at 16:01 | history | answered | abx | CC BY-SA 3.0 |