Finite $\Sigma$-Rickart modules

Abstract

In this article, we study the notion of a finite $\Sigma$-Rickart module, as a module theoretic analogue of a right semi-hereditary ring. A module $M$ is called \emph{finite $\Sigma$-Rickart} if every finite direct sum of copies of $M$ is a Rickart module. It is shown that any direct summand and any direct sum of copies of a finite $\Sigma$-Rickart module are finite $\Sigma$-Rickart modules. We also provide generalizations in a module theoretic setting of the most common results of semi-hereditary rings. Also, we have a characterization of a finite $\Sigma$-Rickart module in terms of its endomorphism ring. In addition, we introduce $M$-coherent modules and provide a characterization of finite $\Sigma$-Rickart modules in terms of $M$-coherent modules. At the end, we study when $\Sigma$-Rickart modules and finite $\Sigma$-Rickart modules coincide. Examples which delineate the concepts and results are provided.

This is a modified and extended version of the version submitted for publication