The balance of relative Ext groups defined by semi dualizing modules

Kosar Abolfath Beigi, Kamran Divaani-Aazar, Massoud Tousi

Let $R$ be a commutative Noetherian ring with identity and $C$ a semidualizing module for $R$. Let ${\mathcal{P}}_C(R)$ and ${\mathcal{I}}_C(R)$ denote, respectively, the classes of $…