Apparently, this user prefers to keep an air of mystery about them.
6 Hopfian property Mar 22 '11
4 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 6 '11
1 GIT quotient of an algebraic action Dec 10 '11
1 Principal congruence subgroups of SL(n,Z) Apr 28 '11