Abstract
We establish some properties involving regular morphisms in abelian categories. We show a decomposition theorem on the image of a regular sum of morphisms, a characterization of regular morphisms in terms of consecutive pairs of morphisms, and a description of certain equivalent morphisms. We also generalize Ehrlich’s Theorem on one-sided unit regular morphisms by showing that if [Formula: see text] is an [Formula: see text]-regular object, then a morphism [Formula: see text] is left (right) unit regular if and only if there exists a split monomorphism (epimorphism) [Formula: see text]. We also study regular morphisms determined by generalized inverses in additive categories.
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