摘要: In this paper we derive sufficient conditions for strict convexity of subsets in a complete simply connected smooth Riemannian manifold without focal points in terms of local and global exposed points.
M. Beltagy. LOCAL AND GLOBAL EXPOSED POINTS[J]. 数学物理学报(英文版), 1995, 15(3): 335-341.
M. Beltagy. LOCAL AND GLOBAL EXPOSED POINTS[J]. Acta mathematica scientia,Series B, 1995, 15(3): 335-341.