Modules close to SSP- and SIP-modules

In this paper, we investigate some properties of SIP, SSP and CS-Rickart modules. We give equivalent conditions for SIP and SSP modules; establish connections between the class of semisimple artinian rings and the class of SIP rings. It shows that R is a semisimple artinian ring if and only if RR is SIP and every right R-module has a SIP-cover. We also prove that R is a semiregular ring and J ( R ) = Z ( R R ) if only if every finitely generated projective module is a CSRickart module which is also a C 2 module.