A characterization of the Euclidean sphere
A characterization of the Euclidean sphere
1. Introduction.Let M be a connected Riemannian manifold of dimension n, Co(M) its largest connected group of conformai transformations and Io(M) its largest connected group of isometries.In an earlier paper [2], one of the authors and S. Kobayashi established the following result: THEOREM 1.A compact homogeneous Riemannian manifold for which …