HACETTEPE JOURNAL OF MATHEMATICS AND STATISTICS, cilt.49, sa.3, ss.914-920, 2020 (SCI-Expanded)
A submodule N of a module M is called d-closed if M/N has a zero socle. D-closed submodules are similar concept to s-closed submodules, which are defined through non-singular modules by Goodearl. In this article we deal with modules with the property that all d-closed submodules are direct summands (respectively, closed, pure). The structure of a ring over which d-closed submodules of every module are direct summand (respectively, closed, pure) is studied.