The National Natural Science Foundation of China (No.10971024);Specialized Research Fund for the Doctoral Program of Higher Education (No.200802860024)
A module is called a co-*∞-module if it is co-selfsmall and ∞-quasi-injective. The properties and characterizations are investigated. When a module U is a co-*∞-module, the functor Hom RU(-,U)is exact in Copre...