共查询到17条相似文献,搜索用时 93 毫秒
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本文中我们引进强几乎优越扩张的概念并证明了若S≥R是(强几乎)优越扩张,则S是右Ⅱ-凝聚环当且仅当R是右Ⅱ-凝聚环。 相似文献
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在强正则环的基础上引入几乎强正则环的概念,它们是介于局部环和VNL环之间的一类环.给出几乎强正则环的若干例子,讨论它们的扩张. 相似文献
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设环S是环R的几乎优越扩张.本文证明了R和S具有相同的f.f.P.维数以及finitistic维数.若MS是右S-模,则FP-id(MS)=FP-id(MR).若G是有限群,R是G分次环且|G|-1∈R,则Smash积R#G*和R具有相同的f.f.P.维数,finitistic维数,以及FP-整体维数. 相似文献
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设R是有单位元的环,S是R的几乎优越扩雍,G是有限群且|G^|^-1∈R,证明了R是FC-环当且仅当S是FC-环,也当且仅当Smach积R#G是FC-环。 相似文献
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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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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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Excellent Extensions of RingsLiuZhongkui(刘仲奎)andWangTingZhen(王廷桢)(DepartmentofMathcmatics,NorthwestNormalUniversity,Lanzhon,7... 相似文献
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Huanyin Chen 《代数通讯》2013,41(9):3494-3506
An element a ∈ R is unit-regular provided that there exists an invertible u ∈ R such that a = aua. A ring R is called an almost unit-regular ring provided that for any a ∈ R, either a or 1 ? a is unit-regular. We characterize, in this article, the almost unit-regularity of Morita contexts with zero pairings. We also show that a ring R is unit-regular if and only if M 2(R) is almost unit-regular. Various examples of such rings are constructed by means of formal triangular matrix rings. 相似文献
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Characterizations of Strongly Regular Rings 总被引:9,自引:0,他引:9
Zhang Jule 《东北数学》1994,(3)
CharacterizationsofStronglyRegularRingsZhangJule(章聚乐)(DepartmentofMathematics,AnhuiNormalUniversity,Wuhu241000)Abstract:Inthi... 相似文献
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Mamoru Kutami 《代数通讯》2013,41(7):2171-2182
In this article, we study regular rings satisfying almost comparability. We first show that, for regular rings, almost comparability is inherited by finitely generated projective modules and finite matrix rings, and, as a main result, we prove that the strict cancellation property holds for the family of all finitely generated projective modules over directly finite regular rings satisfying almost comparability. 相似文献
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环的左自由正规化扩张和拟Excellent扩张 总被引:1,自引:0,他引:1
本文引进了环的左自由正规化扩张和拟Excelent扩张,并将环的Excelent扩张的一些性质推广到了左自由正规化扩张和拟Excelent扩张,主要讨论了几乎Noether性,正则性,凝聚性和半遗传性. 相似文献
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Chen Huanyin 《东北数学》1997,(2)
PolynomialRingsoverNon┐noetherianPowerSeriesRingsChenHuanyin(陈焕艮)(DepartmentofMathematics,HunanNormalUniversity,Changsha,4100... 相似文献