Subcategories of extension modules by Serre subcategories
arXiv:1011.0376
Abstract
In this paper, we consider subcategories consisting of the extensions of modules in two given Serre subcategories to find a method of constructing Serre subcategories of the category of modules. We shall give a criterion for this subcategory to be a Serre subcategory.
9 pages, minor changes, title is revised, to appear in Proc. Amer. Math. Soc