由子模格决定的准素模

本文主要给出以下定理C。设Ri(i=1,2)是MLPI环（即Ri是有位单元的结合环，且每个极大左理想必是主理想），元素Pi∈Ri使得RiPi是Ri的极大左理想，Mi是Pi－准素的Ri－模。则我们有以下定理C 设M1的终Goldie维数（＝min{P^n1M1的Goldie维数|n=0,1,2,…|}）≤3，如果有子模格同构f:L(M1)^~-L(M2)。则有逆向全射系{R1/R1P1^n(n∈N)；θ}与{R2／R2P2^n2(n∈N)；θ′n}之间的同构{ψn:R1/R1P^n1→R2/P2^2(n∈N),其中θn和θ′n(n∈N)是自然满同态，ψn(n∈N)是环同构。若令R^*1,R^*2分别是以上两逆向全射系的逆向极限环。则有环同构ψ：R^*1^~-R^*2和M1到M2的ψ－线性同的φ，φ诱导出f:fR1x=R2φ（x），任意x∈M1。易见：（1）当P1＝0＝P2，且M1是有限维向量空间时，由定理C即得射影几何的基本定理；（2）当R1＝Z＝R2，且P1和P2为素数时，由定理C即得Pi＝P2，从百得Baer关于交换p－群的相应结果。     

可补闭子模和有界广义逆模映射

引入了“有界广义逆模映射”的概念 ,并给出了等价刻画 .揭示了有界广义逆模映射和可补闭子模的内在联系 .     

Nest代数的■-子模的主双边模

设 N~6是可分的 Hilbert 空间 H 上的完备 Nest,A 表示由 N~6决定的 Nest 代数,我们得到了 B(H)是一类 A-子模的范数主双边的充要条件,其结果改进和推广了[1]的主要定理,同时也推广了[2]的某些定理.     

离散三角子模

为了构造离散三角模,引入了离散三角子模的概念,给出了生成离散三角(子)模的方法;然后讨论了光滑离散三角子模的结构.     

Nest代数的■-子模的主双边模

设 N~6是可分的 Hilbert 空间 H 上的完备 Nest,A 表示由 N~6决定的 Nest 代数,我们得到了 B(H)是一类 A-子模的范数主双边的充要条件,其结果改进和推广了[1]的主要定理,同时也推广了[2]的某些定理.     

Hopf π-子模

设H为有限型Hopfπ-代数,研究Hopfπ-代数H上的Hopfπ-模与Hopf π-余代数H *上的Hopfπ-余模之间的对偶关系,得出了Hopfπ-子模与Hopfπ-子 余模之间的充分必要条件,推广了Hopf代数中的相关结论.     

具有d-Koszul子模滤的分次模

引入了弱d-Koszul模,它是d-Koszul模的一种自然推广．设A是d-Koszul代数,M是有限生成的分次A-模,则M是弱d-Koszul模当且仅当M具有子模滤:0(?)U0(?)U1(?)…(?)Up=M,使得所有的A-模Ui／Ui-1是d-Koszul模．设M为一个弱d-Koszul模,则作为分次ExtA*(A0,A0)-模,其Koszul对偶:ε(M)=ExtA*(M,A0)是由0次生成的．     

具有d-Koszul子模滤的分次模

引入了弱d-Koszul模,它是d-Koszul模的一种自然推广.设A是d-Koszul代数,M是有限生成的分次A-模,则M是弱d-Koszul模当且仅当M具有子模滤 0(∪) U0(∪)U1(∪)…(∪)Up=M,使得所有的A-模 Ui/Ui-1是d-Koszul模.设M为一个弱d-Koszul模,则作为分次Ext*A(A0,A0)-模,其Koszul对偶,ε(M)=Ext*A(M,A0)是由0次生成的.     

关于所有子模是纯子模的平坦模

引进了一新模类-完全平坦模(每一个商模平坦).并得到了:令M是平坦左R-模,RM是完全平坦模当且仅当RM的所有子模是纯的当且仅当每一个右R-模A是M-平坦的.同时本文用完全平坦模刻画了V.N.正则环.     

I-提升模的有限直和

I-提升模的直和不一定是I-提升模.本文给出了使I-提升模的直和仍是I-提升模成立的条件,即证明了当M=M1⊕M2,其中M1和M2是I-提升的.如果Mi是Mj-投射的（i,j=1,2）或M是duo模,则M是I-提升的.     

ON ALMOST PRIME SUBMODULES

In this article,we define almost prime submodules as a new generalization of prime and weakly prime submodules of unitary modules over a commutative ring with identity.We study some basic properties of...     

INTERSECTION OF PRIME SUBMODULES AND DIMENSION OF MODULES

The aim of this paper is to study the conditions by which a P-prime submodule can be expressed as a finite intersection or union of P-prime submodules. Also corresponding to dimension and rank of modules, some equivalent conditions for a ring to be a Dedekind domain are given.     

Comultiplication submodules of multiplication modules

Abstract

All rings are commutative with identity, and all modules are unital. The purpose of this work is to investigate comultiplication submodules of multiplication modules. Various properties of this class of submodules are considered. Sufficient conditions for the sum and intersection of a finite collection of comultiplication submodules to be a comultiplication submodule are also given.     

On Invertible and Dense Submodules

Abstract

In this paper, the authors give a partial characterization of invertible, dense and projective submodules. In the final section, they give the equivalent conditions to be invertible, dense and projective submodules for a given an R-module M. They also provide conditions under which a given ring R is a Dedekind domain if and only if every non zero submodule of an R-module is locally free.     

Prime and primary submodules of certain modules

In this paper we characterize all prime and primary submodules of the free R-module R ⁿ for a principal ideal domain R and find the minimal primary decomposition of any submodule of R ⁿ . In the case n = 2, we also determine the height of prime submodules.     

Honest submodules

Lattices of submodules of modules and the operators we can define on these lattices are useful tools in the study of rings and modules and their properties. Here we shall consider some submodule operators defined by sets of left ideals. First we focus our attention on the relationship between properties of a set of ideals and properties of a submodule operator it defines. Our second goal will be to apply these results to the study of the structure of certain classes of rings and modules. In particular some applications to the study and the structure theory of torsion modules are provided.     

PURE SUBMODULES AND TORSION FREE IMAGES OF COMPLETELY DECOMPOSABLE TORSION FREE MODULES

ABSTRACT

Prebalanced and precobalanced sequences play an important role in the investigation of Butler Modules. For Butler groups (modules over the integers), they are equivalent conditions. This is not the case for modules over integral domains in general. We investigate conditions when one type of exactness would imply the other. We show that for analytically unramified domains, the equivalence of prebalanced and precobalanced exactness will hold if and only if every maximal ideal has a unique maximal ideal lying over it in the domain's integral closure.     

CLOSED SUBMODULES OF NORMALIZING BIMODULES OVER SEMIPRIME RINGS

In this paper we study closed sub-bimodules of normalizing bimodules over semiprime rings. We extend the main results which are known for centred bimodules and several other results which are new even for centred bimodules are also obtained. In particular, we prove that the theorem on one-to-one correspondence between closed submodules obtained in former papers for centred bimodules is also true for normalizing bimodules. Finally, we give some applications of the main results.

     

Krull Dimension and Classical Krull Dimension of Modules

Using the concept of prime submodule defined by Raggi et al. in [16 Raggi , F. , Rios , J. , Rincón , H. , Fernández-Alonso , R. , Signoret , C. ( 2005 ). Prime and irreducible preradicals . J. Algebra Appl. 4 ( 4 ): 451 – 466 .[Crossref], [Web of Science ®] , [Google Scholar]], for M ∈ R-Mod we define the concept of classical Krull dimension relative to a hereditary torsion theory τ ∈M-tors. We prove that if M is progenerator in σ[M], τ ∈M-tors such that M has τ-Krull dimension then cl.K _τdim (M) ≤ k _τ(M). Also we show that if M is noetherian, τ-fully bounded, progenerator of σ[M], and M ∈ 𝔽_τ, then cl·K _τdim (M) = k _τ(M).