On $L_n$-Injective Modules and $L_n$-Injective Dimensions

Tao Xiong, Fanggui Wang, Lei Qiao +2

Let $R$ be a ring, and $n$ a fixed nonnegative integer. An $R$-module $W$ is called $L_n$-injective if ${\mathrm{Ext}}_R^1(M,W)=0$ for any $R$-module $M$ with flat dimension at mo…