Dokuchaev, M.A.; Kirichenko, V.V.
(Український математичний журнал, 2002)
We say that A is a ring with duality for simple modules, or simply a DSM-ring, if, for every simple right (left) A-module U, the dual module U* is a simple left (right) A-module. We prove that a semiperfect ring is a ...