Abstract
It is proven that every commutative ring whose RD-injective modules are Σ-RD- injective is the product of a pure semisimple ring and a finite ring. A complete characterization of commutative rings for which each Artinian (respectively simple) module is RD-injective, is given. These rescan be obtained by using the properties of RD-flat modules and RD-coflat modules which are respectively the RD-relativization of flat modules and fp-injective modules. It is also shown that a commutative ring is perfect if and only if each RD-flat module is RD-projective.
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