Curvature, diameter and betti numbers

Curvature, diameter and betti numbers
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DOI:
10.1007/bf02566208
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发表时间:
1981-12
影响因子:
0.9
通讯作者:
M. Gromov
M. Gromov
中科院分区:
数学2区
文献类型:
--
作者:
M. Gromov

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本文给出了紧致黎曼流形的Betti数的一个上界和一个下界。这个估计特别表明,大多数流形不允许非负截面曲率的度量。
We give an upper bound for the Betti numbers of a compact Riemannian manifold in terms of its diameter and the lower bound of the sectional curvatures. This estimate in particular shows that most manifolds admit no metrics of non-negative sectional curvature.