A generalization of $oplus$-cofinitely supplemented modules
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Abstract:
We say that a module $M$ is a emph{cms-module} if, for every cofinite submodule $N$ of $M$, there exist submodules $K$ and $K^{'}$ of $M$ such that $K$ is a supplement of $N$, and $K$, $K^{'}$ are mutual supplements in $M$. In this article, the various properties of cms-modules are given as a generalization of $oplus$-cofinitely supplemented modules. In particular, we prove that a $pi$-projective module $M$ is a cms-module if and only if $M$ is $oplus$-cofinitely supplemented. Finally, we show that every free $R$-module is a cms-module if and only if $R$ is semiperfect.
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Journal title
volume 42 issue 1
pages 91- 99
publication date 2016-02-01
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