Pointwise 1/4-pinched 4-manifolds

Pointwise 1/4-pinched 4-manifolds
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DOI:
10.1007/bf00776854
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发表时间:
1991-06
影响因子:
0.7
通讯作者:
Haiwen Chen
Haiwen Chen
中科院分区:
数学4区
文献类型:
--
作者:
Haiwen Chen

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在[H1]中,R.汉密尔顿证明了一个非常漂亮的定理:设M是一个紧的3-流形,它允许一个具有严格正Ricci曲率的黎曼度量。则M也容许一个常正曲率度量。在改进了他的技巧后,他还证明了关于4-流形的一个类似结果:一个具有正曲率算子的紧致4-流形是球面S4或真实的保护空间RP 4 [H2]的同构。
In [H1], R. Hamilton proved a very beautiful theorem: Let M be a compact 3-manifold which admits a riemannian metric with strictly positive Ricci curvature. Then M also admits a metric of'constant positive curvature. After modifying his technique, he also proved a similar result on 4-manifolds: A compact 4-manifold with positive curvature operator is diffeomorphic to either the sphere S4 or the real protective space RP4 [H2].