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局部对称空间中具有平行中曲率向量的伪脐子流形
Pseudo-Umbilical Submanifolds with Parallel Mean Curvature Vector in Locally Symmetric Space
【摘要】 设Nn+p是截面曲率KN满足1/2<δ<KN<1的n+p维局部对称完备的δ-Pinching黎曼流形。Mn是Nn+p的紧致伪脐子流形。本文讨论了这类子流形关于第二基本形式模长的平方、截面曲率及Ricci曲率有关的Pinching定理。
【Abstract】 Letbe a n+p-dimensional locally symmetric complete Riemannian manifold with sectional curvaturesatisfiesand be an n-dimensinal compact Pseudo-Umbilical submanifold in.In this paper,we discussed the Pinching theorem about this manifolds with,Rijij curvature and Ricci curvature.
【关键词】 局部对称;
伪脐子流形;
全脐子流形.;
【Key words】 locally symmetry; pseudo-umbilical submanifold; totally-umbilical submanifold;
【Key words】 locally symmetry; pseudo-umbilical submanifold; totally-umbilical submanifold;
- 【文献出处】 咸阳师范学院学报 ,Journal of Xianyang Normal University , 编辑部邮箱 ,2006年04期
- 【分类号】O186.12
- 【下载频次】27