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