Timeline for Is the group of integer points of a simple real linear algebraic group a maximal closed subgroup?
Current License: CC BY-SA 4.0
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| Oct 14, 2021 at 19:14 | comment | added | Ian Gershon Teixeira | ah I see you are trying to arrange things to get $ \Gamma_0(2) $. I think you still have a typo but if you change your equation to $ X diag(1,2)=diag(1,2)Y $ then it should work out. | |
| Oct 14, 2021 at 13:51 | comment | added | David E Speyer | Thanks for the correction. Actually, the typo was in a different place. See if this works. | |
| Oct 14, 2021 at 13:51 | history | edited | David E Speyer | CC BY-SA 4.0 |
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| Oct 14, 2021 at 13:35 | comment | added | Ian Gershon Teixeira | Wow this is a fabulous counterexample I feel like I'm learning alot! Thanks so much. (Also I think there is a tiny typo in the last line the second matrix in the pair should be [ 2a,b,c, d/2] not [a,2b,c/2,d]) | |
| Oct 14, 2021 at 13:12 | history | answered | David E Speyer | CC BY-SA 4.0 |