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Isomorphism of subshifts is a universal countable borel equivalence relation

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Abstract

We use the theory of Borel equivalence relations to analyze the equivalence relation of isomorphism among one-dimensional subshifts. We show that this equivalence relation is a universal countable Borel equivalence relation, so that it admits no definable complete invariants fundamentally simpler than the equivalence classes. We also see that the classification of higher dimensional subshifts up to isomorphism has the same complexity as for the one-dimensional case.

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  1. Department of Mathematics, Penn State University, University Park, PA, 16802, USA

    John D. Clemens

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  1. John D. Clemens
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Correspondence to John D. Clemens.

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Clemens, J.D. Isomorphism of subshifts is a universal countable borel equivalence relation. Isr. J. Math. 170, 113–123 (2009). https://doi.org/10.1007/s11856-009-0022-0

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  • DOI: https://doi.org/10.1007/s11856-009-0022-0

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