The connected components on the projective line over a ring.
The connections between continued fraction representations of units and certain Hecke groups.
The determination of parabolic points in modular and extended modular groups by continued fractions.
The Farey graph.
The finite subgroups of maximal arithmetic kleinian groups
Given a maximal arithmetic Kleinian group , we compute its finite subgroups in terms of the arithmetic data associated to by Borel. This has applications to the study of arithmetic hyperbolic 3-manifolds.
The full automorphism group of the Kulkarni surface.
The full automorphism group of the Kulkarni surface is explicitly determined. It is employed to give three defining equations of the Kulkarni surface; each equation exhibits a symmetry of the surface as complex conjugation.
The full automorphism groups of hyperelliptic Riemann surfaces.
The fundamental theorem for the projective line over commutative rings. (Short Communication).
The fundamental theorem for the projective line over commutative rings.
The geometry and spectrum of the one holed torus.
The integral homology of SL2 and PSL2 of euclidean imaginary quadratic integers.
The length of a unitary transformation.
The length of a unitary transformation for characteristic 2.
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.