The lower garland of subgroup lattices in linear groups.
The mixed elliptically fixed point property for Kleinian groups.
The modular group action on real characters of a one-holed torus.
The Modular Symbol and Continued Fractions in Higher Dimensions.
The Recent Generalizations of Colored Symmetry
The Rhombidodecahedral Tessellation of 3-Space and a Particular 15-Vertex Triangulation of the 3-Dimensional Torus.
The Schur Multiplicator of SL(2, Z/mZ) and the Congruence Subgroup Property.
The Schur Multipliers of SL (3, Z) and &L (4, Z).
The structure of subnormal subgroups of symplectic groups over local rings.
The subgroups in the special linear group over a skew field that contain the group of diagonal matrices
The theorem of Borevich for the hyperbolic unitary group over a noncommutative field.
The upper central series of some matrix groups
Theory of coverings in the study of Riemann surfaces
For a G-covering Y → Y/G = X induced by a properly discontinuous action of a group G on a topological space Y, there is a natural action of π(X,x) on the set F of points in Y with nontrivial stabilizers in G. We study the covering of X obtained from the universal covering of X and the left action of π(X,x) on F. We find a formula for the number of fixed points of an element g ∈ G which is a generalization of Macbeath's formula applied to an automorphism of a Riemann surface. We give a new method...
Torsion Free Subgroups of Fuchsian Groups and Tessalations of Surfaces.
Torsion matrices over commutative integral group rings.
Let ZA be the integral group ring of a finite abelian group A, and n a positive integer greater than 5. We provide conditions on n and A under which every torsion matrix U, with identity augmentation, in GLn(ZA) is conjugate in GLn(QA) to a diagonal matrix with group elements on the diagonal. When A is infinite, we show that under similar conditions, U has a group trace and is stably conjugate to such a diagonal matrix.
Traces, lengths, axes and commensurability
The focus of this paper are questions related to how various geometric and analytical properties of hyperbolic 3-manifolds determine the commensurability class of such manifolds. The paper is for the large part a survey of recent work.
Tresses, monodromie et le groupe symplectique.
Triangle subgroups of Kleinian groups.
Two Generator Fuchsian Groups of Genus One.
Two-Generator Discrete Free Products.