摘要
A.V.Pogorelov曾证明,若正则凸闭曲面F的Gauss曲率都不大于某一常数K,则F上的封闭测地线的长不小于,本文将这定理推广成为下列定理。定理设凸闭曲面F的比值曲率≤K,则F上连接A,B两定点的测地线的长或等于ρ(A,B),或不小于。关键词:
In this paper we prove the following theorem, it is a generalization of Pogorelov's theorem.Theorem Let F be a convex closed surface with ratio curvature≤K, A, B two fixed points on F and s(AB) the length of geodesic AB on F. Then either s(AB)=ρ(A, B) or
出处
《哈尔滨师范大学自然科学学报》
1994年第3期51-55,共5页
Natural Science Journal of Harbin Normal University
关键词
凸闭曲面
测地圈
比值曲率
Pogorelov定理
Convex closed surface, Infinite entire convex surface, Geodesic circle
Proportional curvature