Some Contributions To Generalized Regular Semigroups

In this thesis, three classes of generalized semigroups are studied. This thesisconsists of these chapters.Chapter 1 is devoted to perfect wrpp semigroups. We obtain some charac-terizations of perfect wrpp semigroups in terms of the Green's (?)-relations.The aim of Chapter 2 is to study wrpp semigroups satisfying permutationidentities. After obtaining some characterizations of wrpp semigroups satisfyingpermutation identities, we establish the structure of such semigroups by using ofweak spined products.In Chapter 3, we investigate rpp semigroups with weak normal idempotents.After obtaining some characterizations of such semigroups, we establish the struc-ture of rpp semigroups with weak normal idempotents.