A generalization of $oplus$-cofinitely supplemented modules

Authors

  • B. Koşar Ondokuz May‎i‎s University, Samsun, Turkey.
  • B. N. Türkmen Amasya University‎, ‎Faculty of Art and Science‎, ‎Ipekkoy‎, ‎Amasya‎, ‎Turkey.
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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a generalization of $oplus$-cofinitely supplemented modules

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Journal title

volume 42  issue 1

pages  91- 99

publication date 2016-02-01

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