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Published online by Cambridge University Press: 25 November 2009
In this paper we introduce
-non-cosingular modules, dual Baer modules and
-modules. We prove that a module M is lifting and
-non-cosingular if and only if it is a dual Baer and
-module. Rings for which all modules are dual Baer are precisely determined. We also give a necessary condition for a finite direct sum of dual Baer modules to be dual Baer.