𝑄𝑞𝑝𝑖 groups and quasi-equivalence

Author:

Goeters H.,Wickless W.

Abstract

A torsion-free abelian group G G is q p i qpi if every map from a pure subgroup K K of G G into G G lifts to an endomorphism of G . G. The class of q p i qpi groups has been extensively studied, resulting in a number of nice characterizations. We obtain some characterizations for the class of homogeneous Q q p i Qqpi groups, those homogeneous groups G G such that, for K K pure in G , G, every θ : K G \theta :K\rightarrow G has a lifting to a quasi-endomorphism of G . G. An irreducible group is Q q p i Qqpi if and only if every pure subgroup of each of its strongly indecomposable quasi-summands is strongly indecomposable. A Q q p i Qqpi group G G is q p i qpi if and only if every endomorphism of G G is an integral multiple of an automorphism. A group G G has minimal test for quasi-equivalence ( m t q e ) mtqe) if whenever K K and L L are quasi-isomorphic pure subgroups of G G then K K and L L are equivalent via a quasi-automorphism of G . G. For homogeneous groups, we show that in almost all cases the Q q p i Qqpi and m t q e mtqe properties coincide.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference4 articles.

1. Lecture Notes in Mathematics;Arnold, David M.,1982

2. Quasipure injective and projective torsion-free abelian groups of finite rank;Arnold, D. M.;Proc. London Math. Soc. (3),1979

3. On the ring of quasi-endomorphisms of a torsion-free group;Reid, James D.,1963

4. Abelian groups cyclic over their endomorphism rings;Reid, J. D.,1983

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