Generalizations of reversible and symmetric rings

This thesis consists of abstract, basic concepts, introduction and three main chapters. The first main section is central reversible rings as a generalization of reversible and central reversible rings are weakly reversible. In the second main chapter, we study central symmetric rings as a generalization of symmetric rings. We investigate which properties of symmetric rings hold for the central case. In the third main chapter, we consider a skew version of reversible and symmetric rings with respect to a ring endomorphism α, in particular we study α- reversible and α- symmetric rings. Also, it is introduced new classes of rings, called central α- reversible and central α- symmetric rings as a generalization of α- reversible and α- symmetric rings. It is proved some results in this general setting.