Timeline for Toric automorphism of P1 times P1 blown up at four pts
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 17, 2011 at 19:42 | comment | added | Alex Suciu | Actually, the group ${\rm SL}(2,\mathbb{Z})$ decomposes as a free product with amalgamation, of the form $\mathbb{Z}_4*_{\mathbb{Z}_2} \mathbb{Z}_6$. Thus, the complete list of finite orders of elements in this group is $\{1, 2, 3, 4, 6\}$. | |
| Sep 15, 2011 at 20:00 | vote | accept | Ying Zhang | ||
| Sep 15, 2011 at 16:23 | history | answered | naf | CC BY-SA 3.0 |