Published January 1, 2023
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The opposite of projectivity by proper classes
Description
In the last decade, two new approaches have been introduced for the analysis of the projectivity of modules. In this paper, the projectivity of modules has been studied with a new approach by using projectively generated proper classes. As an opposite to projectivity, a module M is said to be p-indigent if the projectively generated proper class by M is consisting of exactly the split short exact sequences. We consider rings over which every (finitely generated, finitely presented, cyclic, simple) right R-modules are either projective or p-indigent.
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