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arXiv math/0403052math.DG
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一个Myers型定理与紧Ricci孤子

A Myers-type theorem and compact Ricci solitons

Andrzej Derdzinski

摘要:

设紧致黎曼流形的里奇曲率在每一点都大于度量关于某个固定光滑向量场的李导数。证明了该基本群只有100个共轭类。这特别适用于所有的紧致收缩Ricci孤子。

英文摘要:

Let the Ricci curvature of a compact Riemannian manifold be greater, at every point, than the Lie derivative of the metric with respect to some fixed smooth vector field. It is shown that the fundamental group then has only finitely many conjugacy classes. This applies, in particular, to all compact shrinking Ricci solitons.

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