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arXiv 0811.0192math.DSmath.GR
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有限象圆在旋转数函数下的实解析同态群

Groups of real analytic diffeomorphisms of the circle with a finite image under the rotation number function

Yoshifumi Matsuda

摘要:

我们考虑保向的实解析圆同态群,它们在旋转数函数下有一个有限象。我们证明了,如果这样一个群是非离散的$C^1$ -拓扑,那么它有一个有限的轨道。作为推论,我们证明了如果这样的群没有有限轨道,那么它的每个子群要么包含一个有限指数的循环群,要么包含一个非交换自由子群。

英文摘要:

We consider groups of orientation-preserving real analytic diffeomorphisms of the circle which have a finite image under the rotation number function. We show that if such a group is nondiscrete with respect to the $C^1$-topology then it has a finite orbit. As a corollary, we show that if such a group has no finite orbit then each of its subgroups contains either a cyclic group of finite index or a nonabelian free subgroup.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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