AbstractFirst, the concept of entropy in physics and geometry wil be discussed. In particular, Perelman’s W-entropy will bereviewed. Then the relation between entropy and Sobolev inequality and the uniform Sobolev inequality along the Ricci flow due to Rugang Ye will be presented. Some geometric applications such as in the case of Gromov almost flat manifolds will also be presented
AbstractWe consider smooth Riemannian surfaces whose curvature K satisfies the eguationAlogK-c=aK+b away from points where K=c for some (a,b, c) eIR3, which we callgeneralized Ricci surfaces. This equation generalize a result of Ricci, which provides a necessaryand sufficient condition for the surface to be (locally) minimally and isometrically immersed inEuclidean 3-space. in the first part of...