Abstract If Script A≪ j D j (Script W), where D j (Script W) is the generalised Jacobson radical
of Script W, then a sub-module Script A of a module Script W is said to be D j-small. If …

Let R be an individual left R-module of the same type as W, with W being a ring containing
one. W's submodules N and K should be referred to as N and K, respectively that K⊆ N⊆ W …