【摘要】 讨论了拟常曲率空间具有平行平均曲率向量的紧致伪脐子流形,得到这类子流形关于第二基本形式模长的平方σ、Ricc曲率及数量曲率的若干拼挤定理.更多还原

【Abstract】 Let Mⁿ be a compact pseudoumbilical submanifold with parellel mean curvature in a Riemann manifold N^n+p of quasi constant curvature and the paper.Obtains a few pinching theorems about pseudoumbilical submanifolds.更多还原