Resumen
In this paper, we introduce the concept of a?-open sets as a generalization of ?-open sets in a topological space (X, t). Using this set, we introduce a?T0, a?-T½, a?T1, a?T2, a?D0, a?D1 and a?D2 spaces and study some of its properties. Finally we introduce a(?,?')-continuous mappings and give some properties of such mappings.