For a module-finite algebra over commutative noetherian ring, we give complete description of flat cotorsion modules in terms prime ideals the algebra, as generalization Enochs' result for ring. As consequence, show that pointwise Matlis duality gives bijective correspondence between isoclasses indecomposable injective left and right modules. This is an explicit realization Herzog's homeomorphi...

Let $R$ be a ring and $M$ a right $R$-module with $S=End_R(M)$. A module $M$ is called semi-projective if for any epimorphism $f:Mrightarrow N$, where $N$ is a submodule of $M$, and for any homomorphism $g: Mrightarrow N$, there exists $h:Mrightarrow M$ such that $fh=g$. In this paper, we study SGQ-projective and $pi$-semi-projective modules as two generalizations of semi-projective modules. A ...

Introduction. Lesieur and Croisot in [7] have generalized the classical primary decomposition theory for Noetherian modules over commutative rings to the tertiary decomposition theory for Noetherian modules over rings, which are not necessarily commutative, but which have a certain chain condition on ideals. Riley has shown in [8] that for finitely generated unitary modules over left Noetherian...

We study Serre’s condition (Sn) for tensor products of modules over a commutative noetherian local ring R. Specifically, we consider the following question. For finitely generated R-modules M and N, either which is (n+1)-Tor-rigid, if product M⊗RN satisfies (Sn+1), then does ToriR(M,N)=0 hold all i≥1? The aim this paper to give an affirmative answer question assume freeness on modules. As appli...

Let R be a commutative Noetherian local ring with residue field k. X resolving subcategory of finitely generated R-modules. This paper mainly studies when contains k or consists totally reflexive modules. It is proved that does so if closed under cosyzygies. A conjecture Dao and Takahashi also shown to hold in several cases.

This paper is an exposition of the so-called injective Morita contexts (in which the connecting bimodule morphisms are injective) and Morita α-contexts (in which the connecting bimodules enjoy some local projectivity in the sense of ZimmermannHuisgen). Motivated by situations in which only one trace ideal is in action, or the compatibility between the bimodule morphisms is not needed, we introd...