On chains of free modules over valuation domains
On character tables related to the alternating groups.
On characters and characteristic polynomials of transformation semigroups
On characters of coprime operator groups and the Glaubermann character correspondence.
On characters with minimal defects.
On chirality groups and regular coverings of regular oriented hypermaps
We prove that if the Walsh bipartite map of a regular oriented hypermap is also orientably regular then both and have the same chirality group, the covering core of (the smallest regular map covering ) is the Walsh bipartite map of the covering core of and the closure cover of (the greatest regular map covered by ) is the Walsh bipartite map of the closure cover of . We apply these results to the family of toroidal chiral hypermaps induced by the family of toroidal bipartite maps...
On classes of abelian groups
On classical invariant theory and binary cubics
Let be a reductive complex algebraic group, and let denote the algebra of invariant polynomial functions on the direct sum of copies of the representations space of . There is a smallest integer such that generators and relations of can be obtained from those of by polarization and restitution for all . We bound and the degrees of generators and relations of , extending results of Vust. We apply our techniques to compute the invariant theory of binary cubics.
On classification of semigroup rings.
On classifying subsets of natural numbers by their computable permutations.
On closure operators on monoids
On cohomological periodicity for infinite groups.
On Cohomological Periodicity of ZG-Lattices.
On Collineation Groups of Finite Projective Spaces.
On collineation groups of translation planes of order .
On commutative exclusive semigroups.
On commutative Kleene monoids.
On commutative loops of order with metacyclic inner mapping group and trivial center
Using a construction of commutative loops with metacyclic inner mapping group and trivial center described by A. Drápal, we enumerate presumably all such loops of order , for and primes.
On commutative principal ideal semigroup rings.
On commutative semigroups which are unions of a finite number of principal ideals