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非交换环上的强余挠模 被引量:1

Strongly Cotorsion Modules over Non-commutative Rings
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摘要 设R是任何环,L是R-模.若对任何平坦维数有限的模M,有Ext_R^1(M,L)=0,则L称为强余挠模.证明(F_∞,SC)是余挠理论当且仅当l.FFD(R)<∞,其中F_∞和SC分别表示平坦维数有限的模类和强余挠模类.还证明若w.gl.dim(R)<∞,则强余挠模是内射模.最后证明每一R-模是强余挠模当且仅当R是左完全环,且l.FFD(R)=0. Let R be a ring and L an R-module. If Ext_R^1( M,L) = 0 for all R-module M with finite flat dimension,then L is called strongly cotorsion. In this paper,it is shown that( F_∞,SC) is a cotorsion theory if and only if l. FFD( R) ∞,where F∞and SC denote respectively the class of modules with finite flat dimension and the class of strongly cotorsion modules. It is also shown that if w.gl. dim( R) ∞,then all strongly cotorsion modules are injective. It is finally proved that every R-module is strongly cotorsion if and only if R is left perfect with l. FFD( R) = 0.
出处 《四川师范大学学报(自然科学版)》 CAS 北大核心 2016年第3期314-317,共4页 Journal of Sichuan Normal University(Natural Science)
基金 国家自然科学基金(11171240) 教育部博士点专项科研基金(20125134110002)
关键词 余挠模 强余挠模 平坦维数 左完全环 环的弱finitistic维数 cotorsion module strongly cotorsion module flat dimension left perfect ring weak finitistic dimension of a ring
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参考文献21

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共引文献10

同被引文献14

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