On w-copure projective modules

Refat Abdelmawla Khaled Assaad, Mohammed Tamekkante, Lixin Mao

Let $R$ be a commutative ring. An $R$-module $M$ is said to be $w$-split if Ext${}_R^1(M,N)$ is a GV-torsion $R$-module for all $R$-modules $N$. It is known that every projective m…