Yano K
DEPARTMENT OF MATHEMATICS, UNIVERSITY OF ILLINOIS, URBANA.
Proc Natl Acad Sci U S A. 1969 Feb;62(2):314-9. doi: 10.1073/pnas.62.2.314.
Let M be a Riemannian manifold with constant scalar curvature K which admits an infinitesimal conformal transformation. A necessary and sufficient condition in order that it be isometric with a sphere is obtained.Inequalities giving upper and lower bounds for K are also derived.
设(M)为具有常数量曲率(K)且允许无穷小共形变换的黎曼流形。得到了它与球面等距的一个充要条件。还推导了给出(K)的上下界的不等式。