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设S和R是环.本文证明了若下述条件之一成立,则S和R具有相同的凝聚维数:(1)S是R的优越扩张;(2)S和MMorita等价.作为上述结果的推论,我们证明了环R和下述环类具有相同的凝聚维数:(i)R上的矩阵环Mn(R);(i)R和有限群G(要求|G|-1∈R)的斜群环;(ii)Smash积R#G*(要求G是有限群且|G|-1∈R,R是G分次环) 相似文献
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§1.IntroductionLetAbearingandBasubringofA.AiscaledanextensiuonofBdenotedbyA/BifBandAadmitthesameidentity.ForanextensionA/B,we... 相似文献
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《代数通讯》2013,41(8):2683-2695
The general ideas introduced in Radeleczki and Szigeti (2004) are adapted to investigate quasi cones and cones of rings. Using the finite extension property for cones, we answer the question concerning when a compatible partial order of a ring has a compatible linear extension (equivalently, when the positive cone of this order is contained in a full cone). It turns out that, if there is no such extension, then it is caused by a finite system of polynomial-like equations satisfied by some elements of a certain finite subset of the ring and some positive elements. 相似文献
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本文引进了分次环的分次Excellent扩张概念,设S=⊕_(g∈G)S_g是R=⊕_(g∈G)R_g的分次Excellent扩张,证明了S是分次右V-环当且仅当R是分次右V-环,S是分次PS-环当且仅当R是分次PS-环,S是分次Von Neumann正则环当且仅当R是分次Von Neumann正则环。 相似文献
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《代数通讯》2013,41(2):907-925
In this paper we characterize the largest exchange ideal of a ring R as the set of those elements x ∈ R such that the local ring of R at x is an exchange ring. We use this result to prove that if R and S are two rings for which there is a quasi-acceptable Morita context, then R is an exchange ring if and only if S is an exchange ring, extending an analogue result given previously by Ara and the second and third authors for idempotent rings. We introduce the notion of exchange associative pair and obtain some results connecting the exchange property and the possibility of lifting idempotents modulo left ideals. In particular we obtain that in any exchange ring, orthogonal von Neumann regular elements can be lifted modulo any one-sided ideal. 相似文献
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Li Huishi 《数学年刊B辑(英文版)》1994,15(4):463-468
It is proved that for a left Noetherian z-graded ring A,if every finitely generated graded A-module has finite projective dimension(i.e-,A is gr-regular)then every finitely generated A-module has finite projective dimension(i.e.,A is regular).Some applications of this result to filtered rings and some classical cases are also given. 相似文献
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LI HUISHI 《数学年刊B辑(英文版)》1994,(4)
NOETHERIANGT-REGULARRINGSAREREGULAR¥LIHUISHI(DepartmentofMathematics,ShaanxiNormalUnivisityXi'an710062,China.)Abstract:Itispr... 相似文献
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刘仲奎 《数学年刊A辑(中文版)》2002,(5)
设R是环,(S,≤)是严格全序幺半群,且对任意s∈S都有0≤s.本文证明了环R是拟Baer环当且仅当R上的广义幂级数环[[RS,≤]]是拟 Baer环. 相似文献
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《代数通讯》2013,41(3):727-736
Abstract We consider the class of all commutative reduced rings for which there exists a finite subset T ? A such that all projections on quotients by prime ideals of A are surjective when restricted to T. A complete structure theorem is given for this class of rings,and it is studied its relation with other finiteness conditions on the quotients of a ring over its prime ideals. 相似文献
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Let R be a ring with an endomorphism α and an α-derivation δ. We introduce the notions of symmetric α-rings and weak symmetric α-rings which are generalizations of symmetric rings and weak symmetric rings, respectively, discuss the relations between symmetricα-rings and related rings and investigate their extensions. We prove that if R is a reduced ring and α(1) = 1, then R is a symmetric α-ring if and only if R[x]/(x n) is a symmetric ˉα-ring for any positive integer n. Moreover, it is proven that if R is a right Ore ring, α an automorphism of R and Q(R) the classical right quotient ring of R, then R is a symmetric α-ring if and only if Q(R) is a symmetric ˉα-ring. Among others we also show that if a ring R is weakly 2-primal and(α, δ)-compatible, then R is a weak symmetric α-ring if and only if the Ore extension R[x; α, δ] of R is a weak symmetric ˉα-ring. 相似文献
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(i)环R是左完全环,当且仅当存在一个基数c,使得任意平坦左R-模是一个拟投射模和一个c-限制的ES-模的直和。(ii)R是左Noether环,当且仅当存在一个基数c,使得任意内射左R-模的直和是一个(拟)连续模和一个c-限制的ES-模的直和。 相似文献
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Let G and H be finite groups. It is proves that any ring isomorphism betweencharacter rings of G and H implies a perfect isometry between them, which is also a ringisomorphism. 相似文献