Timeline for For which $n$ is it true that all surjections $SL_2(\mathbb{Z})\rightarrow SL_2(\mathbb{Z}/n\mathbb{Z})$ have kernel $\Gamma(n)$?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Oct 2, 2016 at 1:22 | vote | accept | stupid_question_bot | ||
| Oct 1, 2016 at 14:25 | history | edited | Jeremy Rouse | CC BY-SA 3.0 |
added 49 characters in body
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| Oct 1, 2016 at 14:11 | comment | added | Ian Agol | Claim 2 should follow (for $p$ sufficiently large) from the fact that there are reps. $SL_2(\mathbb{Z})\to SL_2(\mathbb{Z})$ which have infinite-index Zariski dense image (and some kind of strong approximation). | |
| Oct 1, 2016 at 5:30 | history | answered | Jeremy Rouse | CC BY-SA 3.0 |