Algebra

On Abelian Difference Sets.- Unit Groups of Group Rings.- Projective Modules Over Polynomial Rings.- Around Automorphisms of Relatively Free Groups.- Jordan Decomposition.- On the Normalizer Problem.- values at Zero and the Galois Structure of Global Units.- Central Units in Integral Group Rings.- Alternative Loop Rings and Related Topics.- L-values at Zero and the Galois Structure of Global Units.- A Survey of Groups in which Normality or Permutability is a Transitive Relation.- The Structure of Some Group Rings.- Symmetric Elements and Identities in Group Algebras.- Serial Modules and Rings.- On Subgroups Determined by Ideals of an Integral Group Ring.- A Complex Irreducible Representation of the Quaternion Group and a Non-free Projective Module over the Polynomial Ring in Two Variables over the Real Quaternions.