co-{\ast }^s-modules

Abstract

J. Wei recently proposed a concept of {\ast }^s-modules which is another generalization of ∗-modules besides {\ast }^n-modules [J. Algebra, 2005, 291: 312-324]. In this paper, we consider the co-{\ast }^s-modules and give some characterizations and properties. It is found that the class of co-{\ast }^s-modules contains co-selfsmall injective cogenerators. The relations between co-{\ast }^s-modules and co-{\ast }^n-modules are also considered.

Key words： co-{\ast }^s-module; co-selfsmall; {\ast }^s-module; co-{\ast }^n-module

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