X-LIFTING MODULES OVER RIGHT PERFECT RINGS
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Keskin and Harmanci defined the family B(M,X) = {A ≤ M | ∃Y ≤ X, ∃f ∈ HomR(M,X/Y ), Ker f/A ≪ M=A}. And Orhan and Keskin generalized projective modules via the class B(M,X). In this note we introduce X-local summands and X-hollow modules via the class B(M,X). Let R be a right perfect ring and let M be an X-lifting module. We prove that if every co-closed submodule of any projective module P contains Rad(P), then M has an indecomposable decomposition. This result is a generalization of Kuratomi and Chang’s result [9, Theorem 3.4]. Let X be an R-module. We also prove that for an X-hollow module H such that every non-zero direct summand K of H with K ∈ B(H,X), if HΘH has the internal exchange property, then H has a local endomorphism ring
Abstract
Keskin and Harmanci defined the family B(M,X) = {A ≤ M | ∃Y ≤ X, ∃f ∈ HomR(M,X/Y ), Ker f/A ≪ M=A}. And Orhan and Keskin generalized projective modules via the class B(M,X). In this note we introduce X-local summands and X-hollow modules via the class B(M,X). Let R be a right perfect ring and let M be an X-lifting module. We prove that if every co-closed submodule of any projective module P contains Rad(P), then M has an indecomposable decomposition. This result is a generalization of Kuratomi and Chang’s result [9, Theorem 3.4]. Let X be an R-module. We also prove that for an X-hollow module H such that every non-zero direct summand K of H with K ∈ B(H,X), if HΘH has the internal exchange property, then H has a local endomorphism ring
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