We introduce the concept of (strongly) $ss$-radical supplemented modules. We prove that if a submodule $N$ of $M$ is strongly $ss$-radical supplemented and $Rad(M/N)=M/N$, then $M$ is strongly $ss$-radical supplemented. For a left good ring $R$, we show that $Rad(R)\subseteq Soc(_{R}R)$ if and only if every left $R$-module is $ss$-radical supplemented. We characterize the rings over which all modules are strongly $ss$-radical supplemented. We also prove that over a left $WV$-ring every supplemented module is $ss$-supplemented.
28 March 2025 in Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi
In this manuscript, we introduce and study co-coatomically ps-supplemented modules. On condition that each co-coatomic submodule of an T-module A has a ps-supplement within A, then A is termed co-coatomically ps-supplemented. Each radical module is co-coatomically ps-supplemented module. On condition that each left T-module is PS-coinjective, then each left T-module is co-coatomically ps-supplemented. We show that on condition that A is semilocal and Rad(A)≪A, for A, being a cocoatomically ps-supplemented module is equivalent to being ps-supplemented. If A is co-coatomically ps-supplemented T-module, at that case the module A/(〖Soc〗_P (A) ) has each of its coatomic submodules as direct summands. Assuming T to be a left SI-ring with an essential socle, it implies that each left T-module is co-coatomically ps-supplemented.
In this work, we introduce -supplement submodules as a kind of supplements. Specifically, a submodule V of a module M is referred to as a -supplement if there exists another submodule such that and the intersection is projective semisimple. We demonstrate that, over an arbitrary ring, the collection of short exact sequences of the form where is a -supplement in N, constitutes a proper class. In addition, we explore several homological aspects of this class, including the symmetry of the relations between the modules. Finally, we provide that a ring R is a left SI-ring with essential socle if and only if every left R-module is -supplemented.