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arXiv 1505.02482math.DS
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利用非典型等价类计算移位的自同构群

Computing automorphism groups of shifts using atypical equivalence classes

Ethan M. Coven, Anthony Quas, Reem Yassawi

摘要:

本文研究了无限极小移位$(X,σ)$的自同构群,使得复杂度差函数$p(n+1)-p(n)$是有界的。我们给出了$\mbox{Aut}(X,σ)/\langle σ\rangle$的一些新的上界,并研究了单侧情形。对于一类Toeplitz移位,包括由具有重合和高度为1的定长本原替换定义的移位,证明了其双边自同构群是一个循环群.接下来我们重点关注由原始恒定长度替换产生的位移。对于这些移位,我们给出了一个计算它们的双边自同构群的算法,作为推论,我们描述了如何计算两个这样的移位之间的共轭集。

英文摘要:

We study the automorphism group of an infinite minimal shift $(X,σ)$ such that the complexity difference function, $p(n+1)-p(n)$, is bounded. We give some new bounds on $\mbox{Aut}(X,σ)/\langle σ\rangle$ and also study the one-sided case. For a class of Toeplitz shifts, including the class of shifts defined by constant length primitive substitutions with a coincidence and with height one, we show that the two-sided automorphism group is a cyclic group. We next focus on shifts generated by primitive constant length substitutions. For these shifts, we give an algorithm that computes their two-sided automorphism group, As a corollary we describe how to compute the set of conjugacies between two such shifts.

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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