On torsion-free periodic rings.
On Virtual Properties and Group Extensions.
Projektivitätstypen torsionsfreier abelscher Gruppen vom Rang 1
Purely finitely generated Abelian groups
Quasi-balanced torsion-free groups
An exact sequence of torsion-free abelian groups is quasi-balanced if the induced sequence is exact for all rank-1 torsion-free abelian groups . This paper sets forth the basic theory of quasi-balanced sequences, with particular attention given to the case in which is a Butler group. The special case where is almost completely decomposable gives rise to a descending chain of classes of Butler groups. This chain is a generalization of the chain of Kravchenko classes that arise from balanced...
Quasi-isomorphism and -representations for a class of Butler groups
Regularität in torsionsfreien abelschen Gruppen
Regulierende Untergruppen und der Regulator fast vollständig zerlegbarer Gruppen
Representation Type of Posets and Finite Rank Butler Groups
Rings on certain classes of torsion-free Abelian groups
Rings on completely decomposable torsion-free Abelian groups
Schichtengleiche Gewichte und Butlergruppen
Self-cancellation of torsion-free Abelian groups of finite rank.
Splitting in abelian groups
Splitting of pure subgroups
Square subgroups of rank two abelian groups
Let G be an abelian group and ◻ G its square subgroup as defined in the introduction. We show that the square subgroup of a non-homogeneous and indecomposable torsion-free group G of rank two is a pure subgroup of G and that G/◻ G is a nil group.
Strong -groups
Subquadratic growth of the averaged Dehn function for free Abelian groups.
Sur les groupes quasi-purs-projectifs sans torsion
The Cayley graphs of and the limits of vertex-primitive graphs of -type.