Abstract
The concept of generalized open sets in generalized topological spaces was introduced by A. Csaszar [6,7]. In this paper, we introduce the concept of gamma*-semi-open sets and investigate the related topological properties of the associated topologies SO gamma* (X) and T-gamma. We also introduce the concepts of A(S)(gamma)-sets and A(s)(gamma)-sets which generalize g. A(s)-sets and g. v(s)-sets respectively introduced by Minguel Caldas and Julian Dontchev [5].