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Finite order automorphisms and dimension groups of Cantor minimal systems

机译:Cantor极小系统的有限阶自同构和维群

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摘要

We compute the dimension group of the skew product extension of a Cantor minimal system associated with a finite group valued cocycle. Using it, we study finite subgroups in the commutant group of a Cantor minimal system and prove that a finite subgroup of the kernel of the mod map must be cyclic. Moreover, we give a certain obstruction for finite subgroups of commutant groups to have non- zero intersection to the kernel of mod maps. We also give a necessary and sufficient condition for dimension groups so that the kernel of the mod map can include a finite order element.
机译:我们计算与有限群值cocycle相关的Cantor最小系统的偏乘积扩展的维群。使用它,我们研究了Cantor极小系统的交换群中的有限子群,并证明了mod映射的核的有限子群必须是循环的。此外,我们为交换组的有限子组与mod映射的核具有非零交集提供了一定的障碍。我们还为维组提供了必要和充分的条件,以便mod映射的内核可以包含有限阶元素。

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