Modules with projective socles
Received: 3 November 1992
Mathematics Subject Classification: 16D40
Abstract Modules (resp., rings) with projective socles are called PS-modules (resp. PS-rings) which are preserved by Morita equivalences and excellent extensions. Although a left semihereditary ring or a local PS-ring need not be a right PS-ring, we show that a duo PS-ring must be a ring PS-ring.