Solution of the congruence subgroup problem for and
Solvable infinite-dimensional linear groups with restrictions on the nonabelian subgroups of infinite rank.
Solvable linear groups on vector spaces whose dimension is the product of two primes.
Solvable Normal Subgroups and Nilpotent Ideals in Matrix Rings.
Some Characterizations of Bruhat Ordering on a Coxeter Group and Determination of the Relative Möbius Function
Some examples of discrete groups and hyperbolic orbifolds of infinite volume.
Some Remarks of Kleinian Groups.
Some remarks on non-discrete Möbius groups.
Some surface subgroups survive surgery.
Sottogruppi -congruenziali di
Spiegelungsrelationen in den engeren orthogonalen Gruppen.
Stratification of the discriminant in Reflection groups.
Structure of unitary groups over finite group rings and its application
In this paper, we determine all the normal forms of Hermitian matrices over finite group rings , where , is a commutative -group with order . Furthermore, using the normal forms of Hermitian matrices, we study the structure of unitary group over through investigating its BN-pair and order. As an application, we construct a Cartesian authentication code and compute its size parameters.
Su una generazione del gruppo simplettico modulare di Siegel-Conforto
Subgroup growth and congruence subgroups.
Subgroup Lattices for Crystallographic Groups
Subgroups of Finite Index of Fuchsian Groups.
Subgroups of Infinite Index in Fuchsian Groups.
Subgroups of the (2,3,7) Triangle Group.
Subgroups of the Clifford group.