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arXiv · 1307.5329

Suffix conjugates for a class of morphic subshifts

James D. Currie·Narad Rampersad·Kalle Saari
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Abstract

Let A be a finite alphabet and f: A^* --> A^* be a morphism with an iterative fixed point f^ω(α), where α is in A. Consider the subshift (X, T), where X is the shift orbit closure of f^ω(α) and T: X --> X is the shift map. Let S be a finite alphabet that is in bijective correspondence via a mapping c with the set of nonempty suffixes of the images f(a) for a in A. Let calS be a subset S^N be the set of infinite words s = (s_n)_{n\geq 0} such that π(s):= c(s_0)f(c(s_1)) f^2(c(s_2))... is in X. We show that if f is primitive and f(A) is a suffix code, then there exists a mapping H: calS --> calS such that (calS, H) is a topological dynamical system and π: (calS, H) --> (X, T) is a conjugacy; we call (calS, H) the suffix conjugate of (X, T). In the special case when f is the Fibonacci or the Thue-Morse morphism, we show that the subshift (calS, T) is sofic, that is, the language of calS is regular.

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James D. Currie, Narad Rampersad, Kalle Saari. 2013-07-19. Suffix conjugates for a class of morphic subshifts. https://doi.org/10.1017/etds.2014.5

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