期刊文献+

阿贝尔范畴的子范畴的扩张的同调有限性

Homological finiteness of extensions of subcategories in an Abelian categories
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摘要 同调有限(即反变有限或正变有限)子范畴在代数表示论研究中起着重要作用.本文研究了阿贝尔范畴的子范畴扩张的反变有限、正变有限性.特别地,作者证明了在一定条件下两个torsion类的扩张子范畴是torsion类,并将此结果应用到上三角矩阵代数上得到构造上三角矩阵代数上的torsion类方法. The notion of contravariantly (or covariantly) finite subcategories is important in the study of representations. In this paper, we study the homological finiteness of various extensions of subcatego- ries in an Abelian categories. In particular, the extensions of two torsion classes are proved to be torsion classes under a reasonable condition. An application of this result to triangular matrix algebras is given.
出处 《四川大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第4期756-760,共5页 Journal of Sichuan University(Natural Science Edition)
基金 四川大学青年教师科研启动基金(2010SCU11071)
关键词 正变有限子范畴 反变有限子范畴 torsion类 扩张子范畴 上三角矩阵代数 covariantly finite subcategories contravariantly finite subcategories torsion classes exten- sions of subcategories triangular matrix algebras
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参考文献10

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