A module M is said to have the closed intersection property (briefly CIP) if, the intersection ofany two closed submodules of M is again closed [6]. In this paper we present the dual of theCIP, namely, M has the closed sum property (briefly CSP) for which the sum of any two closedsubmodules, so the submodule generated by their union, is a closed submodule, too. Weinvestigate the concept of CSP. Basic properties and some relations of these modules aregiven
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