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arXiv 0907.2876math.DS
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某些单侧代换子移位的Bratteli-Vershik表示

Bratteli-Vershik representations of some one-sided substitution subshifts

Reem Yassawi

摘要:

我们研究了单侧替换子移位,以及如何使用Bratteli-Vershik系统来表示它们。特别是,我们专注于最小的可识别的替代,使生成的单侧替代subshift只包含一个非移位可逆的元素(一个分支点),我们称这些替代准可逆。我们给出了一个算法来检查一个替代是否是拟可逆的,并证明了任何替代与有理Perron值是轨道等价的拟可逆替代。如果拟可逆置换是左真的,则它的子移位等于其中原始分支点是新置换不动点的置换子移位。我们利用这些结果证明了任何合理的拟可逆置换子移位都有一个Bratteli-Vershik表示。我们还给出了一个例子,一对替代的2侧子移位是拓扑共轭的,而他们的1侧子移位不是。

英文摘要:

We study one-sided substitution subshifts, and how they can be represented using Bratteli-Vershik systems. In particular we focus on minimal recognizable substitutions such that the generated one-sided substitution subshift contains only one non-shift-invertible element (a branch point), and we call these substitutions quasi-invertible. We give an algorithm to check whether a substitution is quasi-invertible, and show that any substitution with a rational Perron value is orbit equivalent to a quasi-invertible substitution. If the quasi-invertible substitution is left proper, then its subshift is equal to a substitution subshift where the original branch point is the new substitution fixed point. We use these results to prove that any reasonable quasi-invertible substitution subshift has a Bratteli-Vershik representation. We also give an example of a pair of substitutions whose 2-sided subshifts are topologically conjugate, while their 1-sided subshifts are not.

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