(Strongly) $M-\pazocal{A}-$Injective(Flat) Modules (1301.7050v1)

Abstract: Let $M$ be a left $R-$module and $\pazocal{A}={A}{A\in\pazocal{A}}$ be a family of some submodules of $M$. It is introduced the classes of (strongly) $M-\pazocal{A}-\mathrm{injective}$ and (strongly) $M-\pazocal{A}-\mathrm{flat}$ modules which are denoted by $(S) M-\pazocal{A}I$ and $(S) M-\pazocal{A}F$, respectively. It is obtained some characterizations of these classes and the relationships between these classes. Moreover it is investigated $(S) M-\pazocal{A}I$ and $(S) M-\pazocal{A}F$ precovers and preenvelopes of modules. It is also studied $\pazocal{A}$-coherent, $F\pazocal{A}$ and $P\pazocal{A}$ modules. Finally more generally we give the characterization of $S-\pazocal{A}I(F)$ modules where $\pazocal{A}={A}{A\in\pazocal{A}}$ is a family of some left $R-$modules.