Uniquely strongly clean triangular matrix rings

An element a of a ring R is called uniquely strongly clean if it is the sum of an idempotent and a unit that commute, and in addition, this expression is unique. R is called uniquely strongly clean if every element of R is uniquely strongly clean. The uniquely strong cleanness of the triangular matrix ring is studied. Let R be a local ring. It is shown that any n × n upper triangular matrix ring over R is uniquely strongly clean if and only if R is uniquely bleached and R/J（R） ≈Z2.

Extensions of strongly π-regular general rings

The concept of the strongly π-regular general ring （with or without unity） is introduced and some extensions of strongly π-regular general rings are considered. Two equivalent characterizations on strongly π- regular general rings are provided. It is shown that I is strongly π-regular if and only if, for each x ∈I, x^n =x^n＋1y = zx^n＋1 for n ≥ 1 and y, z ∈ I if and only if every element of I is strongly π-regular. It is also proved that every upper triangular matrix general ring over a strongly π-regular general ring is strongly π-regular and the trivial extension of the strongly π-regular general ring is strongly clean.

NGR-clean环

若环R中的任意元素都能表示成一个(强)π-正则元和一个幂零元之和,则称环R是(强)NGR-clean环。研究给出(强)NGR-clean环的一些基本性质,证明了若I是环R的诣零理想,则R是NGR-clean环当且仅当R/I是NGR-clean环。此外,还研究了(强)NGR-clean环与一些环类之间的联系以及(强)NGR-clean环的几类扩张。

Strongly Clean Matrix Rings over a Skew Monoid Ring

Let R be a ring with an endomorphismσ,F∪{0}the free monoid generated by U={u1,…,ut}with 0 added,and M a factor of F obtained by setting certain monomials in F to 0 such that M^(n)=0 for some n.Then we can form the non-semiprime skew monoid ring R[M;σ].A local ring R is called bleached if for any j∈J(R)and any u∈U(R),the abelian group endomorphisms l_(u)−r_(j) and l_(j)−r_(u) of R are surjective.Using R[M;σ],we provide various classes of both bleached and non-bleached local rings.One of the main problems concerning strongly clean rings is to characterize the rings R for which the matrix ring M_(n)(R)is strongly clean.We investigate the strong cleanness of the full matrix rings over the skew monoid ring R[M;σ].

Clean一般环的几点注记

环是指具有单位元的结合环,而一般环是指有或没有单位元的结合环.一般环I称为是强Clean的,如果I中每个元素a具有下述的形式a=e+q,其中e^2=e∈I,q∈Q(I)={q∈I|q+p+pq=p+q+pq=0对某个p∈I}且eq=qe.这一概念是Nicholson中强Clean环概念的真推广,强Clean一般环的刻画给出了。基于此,证明了强Clean一般环的单边理想也是强Clean的,并证明了如果I是强Clean一般环,那么,对于任意x∈I,I在x处的局部环I_x也是强Clean的,特别地,强Clean一般环的角落子环eRe总是强Clean的对于任意的e^2=e∈I.这推广了Chen中的主要结果.

A Generalization of Strongly Nil Clean Rings

Generalizing the notion of strongly nil clean rings,we introduce strongly quasinil clean rings.Some fundamental properties and equivalent characterizations of this class of rings are provided.By means of g-Drazin inverses,Cline's formula and Jacobson's lemma for strongly quasi-nil clean elements are investigated.

Strongly Clean Matrices over Commutative Domains

We get criteria of strong cleanness for several classes of 2 × 2 matrices over integers. For commutative local domains, we establish ones in terms of solvability of quadratic equations. Strongly clean matrices over power series are also studied.

Morphic-环在约化条件下的一些刻划

文中给出了morphic-环在约化条件下的一些刻划,并证明了约化的morphic-环是强clean环。

UQ-环和强UJII-环

本文引入了UQ-环和UJII-环的概念,推广了UJ-环.利用环论中元素的技巧,研究了UQ-环和UJII-环的性质和结构,相关结果丰富了环中关于元素分解的理论.

交换局部环上强J-clean矩阵（英文）

环中元素称为强J-clean,如果它可写成幂等元与其Jacobson根中元素之和,并且它们可交换.本文研究了交换局部环上强J-clean 2×2矩阵,进而确定了素数p生成的素理想的局部化环Z_(p)和p-adic整数环Z_p上强J-clean 2×2矩阵.

强右极小内射, semiperfect,右 PF, clean n阶三角矩阵环的等价刻画

设n是任意取定的正整数,给出了强右极小内射,semiperfect,右PF, clean n阶三角矩阵环的等价刻画。

GWCN环的若干性质

给出了GWCN环的一些例子,研究了GWCN环的扩张,讨论了GWCN环的正则性和clean性。