(1) Department of Mathematics and Statistics, HuaZhong Normal University, Wuhan, Hubei, 430079, China;(2) Department of Mathematics, University of Science and Technology of China, Hefei, Anhui, 230026, China
Abstract:
We establish a comparison-estimate of the second Rauch type for Ricci curvature. As an application, we get a result of local splitting for Riemannian manifolds. This work is partly supported by the National Natural Science Foundation (10371047) of China.