Separable Moduln von Algebren über Ringen.
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Robert Wisbauer (1978)
Journal für die reine und angewandte Mathematik
Maurice Ginocchio (1974)
Annales de l'I.H.P. Physique théorique
Corrigan, E. (1985)
Proceedings of the Winter School "Geometry and Physics"
A. M. Aghdam, A. Najafizadeh (2009)
Colloquium Mathematicae
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.
H. Röhrl, M.B. Wischnewsky (1976)
Manuscripta mathematica
Solange Legrand, Denise Legrand (1978)
Journal für die reine und angewandte Mathematik
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