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arXiv math/9908007math.DS
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指数与概周期轨道

Exponents and Almost Periodic Orbits

Alex Clark

摘要:

在度量空间中引入实数映射的指数群,并给出了指数群嵌入映象闭包的第一Cech上同调群的条件.我们证明了这个群推广了由几乎周期轨道的Fourier-Bohr指数生成的实数的子群,并且证明了在完全度量空间中的任何极小几乎周期流都是由这个群在拓扑等价下确定的.我们还开发了一种方法,将群与度量空间的任何自同胚相关联,该度量空间推广了具有无理旋转数的圆的方向保持同胚的旋转数。

英文摘要:

We introduce the group of exponents of a map of the reals into a metric space and give conditions under which this group embeds in the first Cech cohomology group of the closure of the image of the map. We show that this group generalizes the subgroup of the reals generated by the Fourier-Bohr exponents of an almost periodic orbit and that any minimal almost periodic flow in a complete metric space is determined up to (topological) equivalence by this group. We also develop a way of associating groups with any self-homeomorphism of a metric space that generalizes the rotation number of an orientation-preserving homeomorphism of the circle with irrational rotation number.

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