AlexandrovCOCA¹⁴⁷⁴⁸⁰BNC⁹¹⁵¹⁷⁺⁸ 基本例句 亚历山德罗夫¹⁰⁰ It shows that there are similarities between the role of the link of a hypersurface singularity and the space of directions of a singularity in an Alexandrov space. 证明超曲面奇点的链环与亚历山大洛夫空间的奇点的方向空间有一些相似之处。 iciba