The Intersection of Similarity and Metric Equivalence Relations of Operators

Abstract

In this paper, we define the intersection of similarity and metric equivalence relations. We investigate the resulting equivalence relation of operators(metro-similarity) acting on finite dimensional separable complex Hilbert spaces. We then give conditions under which two operators are metro-similar.

Study of N(k)-Quasi Einstein Manifolds with Certain Curvature Restrictions

Abstract

This paper deals with the study of -quasi-Einstein manifolds under certain curvature restrictions. We construct the non-trivial physical and geometrical examples of -quasi-Einstein manifolds, which validate the existence of such manifolds. The necessary and sufficient conditions for which the conformally and quasi-conformally flat -quasi-Einstein manifolds satisfy certain curvature restrictions are derived. We also prove that the generator of the manifold is a Killing vector field and the integral curves generated by the characteristic vector field are geodesics.