Geodesic
On $\mu $-singular and $\mu $-extending modules
Archivum mathematicum, Tome 48 (2012) no. 3, pp. 183-196

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Let $M$ be a module and $\mu $ be a class of modules in $\operatorname{Mod}-R$ which is closed under isomorphisms and submodules. As a generalization of essential submodules Özcan in [8] defines a $\mu $-essential submodule provided it has a non-zero intersection with any non-zero submodule in $\mu $. We define and investigate $\mu $-singular modules. We also introduce $\mu $-extending and weakly $\mu $-extending modules and mainly study weakly $\mu $-extending modules. We give some characterizations of $\mu $-co-H-rings by weakly $\mu $-extending modules. Let $R$ be a right non-$\mu $-singular ring such that all injective modules are non-$\mu $-singular, then $R$ is right $\mu $-co-H-ring if and only if $R$ is a QF-ring.
DOI : 10.5817/AM2012-3-183
Classification : 16D10, 16D70, 16D99, 16S90
Keywords: $\mu $-essential submodule; $\mu $-singular module; $\mu $-extending module; weakly $\mu $-extending module 
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Talebi, Yahya; Hamzekolaee, Ali Reza Moniri. On $\mu $-singular and $\mu $-extending modules. Archivum mathematicum, Tome 48 (2012) no. 3, pp. 183-196. doi: 10.5817/AM2012-3-183

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