Timeline for Are there open subgroups of $SL_2(\widehat{\mathbb{Z}})$ which are $GL_2(\widehat{\mathbb{Z}})$-conjugate, but not $SL_2$-conjugate?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Aug 25, 2017 at 17:58 | vote | accept | stupid_question_bot | ||
| Aug 23, 2017 at 13:29 | answer | added | François Brunault | timeline score: 11 | |
| Aug 19, 2017 at 4:31 | comment | added | Ian Agol | There are cyclic subgroups in $SL_2(\mathbb{Z})$ which are conjugate to a cyclic subgroup in $GL_2(\mathbb{Z})$, but not in $SL_2(\mathbb{Z})$, such as $[[43, 10], [30, 7]]$. One could see if this remains true when projecting to $GL_2(\hat{\mathbb{Z}})$. | |
| Aug 18, 2017 at 21:24 | history | asked | stupid_question_bot | CC BY-SA 3.0 |