Vol. 85, No. 2, 1979

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The projectivity of Ext(T, A) as a module over E(T)

Joseph Nicholas Fadyn

Vol. 85 (1979), No. 2, 383–392
Abstract

Let A and T be abelian groups. Then Ext(T,A) can be considered as a right module over E(T), the ring of endomorphisms of T. In this paper necessary and sufficient conditions are developed for Ext(T,A) to be E(T)-projective whenever T is reduced torsion and A is reduced.

Mathematical Subject Classification 2000
Primary: 20K10
Milestones
Received: 14 December 1977
Revised: 16 August 1978
Published: 1 December 1979
Authors
Joseph Nicholas Fadyn