Geodesic
$H$-supplemented modules with respect to a preradical
Algebra and discrete mathematics, Tome 12 (2011) no. 1, pp. 116-131

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Let $M$ be a right $R$-module and $\tau$ a preradical. We call $M$ $\tau$-$H$-supplemented if for every submodule $A$ of $M$ there exists a direct summand $D$ of $M$ such that $(A + D)/D \subseteq \tau(M/D)$ and $(A + D)/A \subseteq \tau(M/A)$. Let $\tau$ be a cohereditary preradical. Firstly, for a duo module $M = M_{1} \oplus M_{2}$ we prove that $M$ is $\tau$-$H$-supplemented if and only if $M_{1}$ and $M_{2}$ are $\tau$-$H$-supplemented. Secondly, let $M=\oplus_{i=1}^nM_i$ be a $\tau$-supplemented module. Assume that $M_i$ is $\tau$-$M_j$-projective for all $j > i$. If each $M_i$ is $\tau$-$H$-supplemented, then $M$ is $\tau$-$H$-supplemented. We also investigate the relations between $\tau$-$H$-supplemented modules and $\tau$-($\oplus$-)supplemented modules.
Keywords: $H$-supplemented module, $\tau$-$H$-supplemented module, $\tau$-lifting module. 
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     title = {$H$-supplemented modules with respect to a preradical},
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     pages = {116--131},
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     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2011_12_1_a5/}
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Yahya Talebi; A. R. Moniri Hamzekolaei; Derya Keskin Tütüncü. $H$-supplemented modules with respect to a preradical. Algebra and discrete mathematics, Tome 12 (2011) no. 1, pp. 116-131. http://geodesic.mathdoc.fr/item/ADM_2011_12_1_a5/