Timeline for Normalizer of SL_2(Z) in GL_2(R)
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 21, 2014 at 10:15 | history | edited | Alex Degtyarev | CC BY-SA 3.0 |
An auxiliary fact proved.
|
| Feb 21, 2014 at 9:21 | comment | added | Alex Degtyarev | I will edit the answer. | |
| Feb 21, 2014 at 6:34 | comment | added | Geoff Robinson | How do you justify the fact that the only outer automorphism of ${\rm PSL}(2,\mathbb{Z})$ is that induced by the action of ${\rm PGL}$? | |
| Feb 21, 2014 at 0:35 | history | answered | Alex Degtyarev | CC BY-SA 3.0 |