We obtain a rigidity theorem for submanifold with parallel the second fundamental form in de Sitter space.
5.得到了de Sitter空间中具有平行第二基本形式的子流形的一个刚性定理。
参考来源 - 关于de Sitter空间中子流形问题的若干研究·2,447,543篇论文数据，部分数据来源于NoteExpress
By the use of group action and normal covering we give an answer in some conditions from topological rigidity theorem in this article.
本文通过群作用和正则覆盖，利用拓扑刚性定理对此问题给出一个判定性条件。
This paper discusses the space-like submanifolds with constant mean curvature in a pseudo-Riemannian space form, and obtain an integrate inequality and a rigidity theorem.
本文研究了伪黎曼空间型中具有常平均曲率的类空子流形，得到了这类空子流形的一个积分不等式及刚性定理。
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