On a question of M. Conder
We show that the special linear group , over the integers, is not -generated. This gives a negative answer to a question of M. Conder.
On arithmetic Fuchsian groups and their characterizations
This is a small survey paper about connections between the arithmetic and geometric properties in the case of arithmetic Fuchsian groups.
On free subgroups of generalized triangle groups.
On Integral Groups. I. The Reducible Case.
On Integral Groups. II. The Irreducible Case.
On subgroups of GL (n, A) which are generated by commutators. II.
On Subgroups of GL(n, A) which Are Generated by Commutators.
On suborbital graphs for the normalizer of .
On the Albanese variety of the moduli space of polarized K3 surfaces.
On the congruence subgroup problem, II.
On the Congruence Subgroups Problem: Determination of the "Metaplectic Kernel".
On the congruence-subgroup problem for some anisotropic algebraic groups over number fields.
On the Cuspidal Cohomology of the Bianchi Modular Groups.
On the Homology and Cohomology of Congruence Subgroups.
On the number of subgroups of given index in the modular group.
On the principal congruence subgroups of the Hecke-group .
On the Top Betti Number of Subgroups of SL(n,Z).
Operator k-theory for the group SU(n, 1).