Abstract : In this paper,we study compact Riemannian manifolds which Ricci curvature ten-sors are parallel,and establish some pinching theorems for square of length of the Riemanniancurvatuer tensor.

 
  • 摘要 : 本文研究李奇曲率平行的封闭黎曼流形,证明了黎曼曲率平方的一个拚挤定理。
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