Let R be a ring and let ΩR be the set of maximal right ideals of R. An R-module M is called an sd-Rickart module if, for every nonzero endomorphism… Click to show full abstract
Let R be a ring and let ΩR be the set of maximal right ideals of R. An R-module M is called an sd-Rickart module if, for every nonzero endomorphism f of M, Imf is a fully invariant direct summand of M. We obtain a characterization for an arbitrary direct sum of sd-Rickart modules to be sd-Rickart. We also obtain a decomposition of an sd-Rickart R-module M provided that R is a commutative Noetherian ring and Ass(M) ∩ ΩR is a finite set. In addition, we introduce and study a generalization of sd-Rickart modules.
               
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