compact umbilical 中文意思是什麼
compact umbilical
解釋
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This paper contains three chapters. we discuss the pinching problems on the length of the second fundamental form of compact space - like submanifolds mn with unit parallel mean curvature vector in the de sitter space spn + p. in particular, a sufficient condition for mn with constant scalar curvature to be totally umbilical is given
討論desitter空間s _ p ~ ( n + p )中具有平行的單位平均曲率向量的緊致類空子流形m ~ n的第二基本形式長度拼擠問題,給出了具有常數量曲率的這種子流形是全臍球面的一個充分條件。
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