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Questions
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Principal congruence subgroups of $SL(n, \mathbb{Z})$

apr 20 11 at 20:16 Ralph 12.5k●10●36

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Hopfian property

jul 22 at 22:21 Fernando Muro 5,141●1●9●15

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Suppose $\Gamma_m$ is a principal congruence subgroup of level m contained in a finite index subgroup $\Gamma$ of $SL(n,\mathbb Z)$. Is $\Gamma_m$ characteristic in $\Gamma$?

sep 16 11 at 19:17 Poove 195●5

 
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GIT quotient of an algebraic action

dec 10 11 at 20:40 Otis Chodosh 951●5●14

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Principal congruence subgroups of SL(n,Z)

apr 29 11 at 10:12 Ralph 12.5k●10●36