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:
bulletin of the iranian mathematical societyPublisher: iranian mathematical society (ims)
ISSN 1017-060X
volume 42
issue 1 2016
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