Let be a commutative Noetherian ring and let be a semidualizing -module. We prove a result about the covering properties of the class of relative Gorenstein injective modules with respect to which is a generalization of Theorem 1 by Enochs and Iacob (2015). Specifically, we prove that if for every -injective module , the character module is -flat, then the class is closed under direct sums and direct limits. Also, it is proved that under the above hypotheses the class is covering....
Let be a commutative Noetherian ring. It is shown that the finitely generated -module with finite Gorenstein dimension is reflexive if and only if is reflexive for with , and for with . This gives a generalization of Serre and Samuel’s results on reflexive modules over a regular local ring and a generalization of a recent result due to Belshoff. In addition, for we give a characterization of -Gorenstein rings via Gorenstein dimension of the dual of modules. Finally it is shown...
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