n.超曲面

The general event horizon formula of black hole is given from null hypersurface equation. 从零曲面方程出发

The former is described by a few equations, whereas the latter requires the specification of vast amounts of initial data on some hypersurface. 前者只包含了几个方程式，而后者却需要在某个超曲面（hypersurface）上，给定一大堆初始资料。

In this paper,an intrinsic condition for a Compact Space-like hypersurface with constant scalar curvature in a de Sitter space to be totally umbilical is obtained. 在这篇文章中

In this paper, an intrinsic condition for a Compact Space-like hypersurface with constant scalar curvature in a de Sitter space to be totally umbilical is obtained. 摘要在这篇文章中，讨论了具有常数量曲率的拟紧致超曲面，并给出了它是全脐子流形的一个全脐条件。

In this paper , a rigidity theorem of hypersurface in real space form will begiven.In addition, we obtain rigidity theorems of submanifold in sphere which improvethe result of Hou and Xu. 本文给出实空间形式中超曲面的一个刚性定理，同时也得到求面中子流形的刚性结果.