t-Dual Baer Modules and t-Lifting Modules

Abstract

We introduce the notions of t-lifting modules and t-dual Baer modules, which are generalizations of lifting modules. It is shown that an amply supplemented module $M$ is t-lifting if and only if $M$ is t-dual Baer and a t-$\mathcal{K}$-module. We also prove that, over a right perfect ring $R$, every noncosingular $R$-module is injective if and only if every $R$-module is t-dual Baer if and only if every $R$-module is t-lifting if and only if every injective $R$-module is t-lifting.