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A Characterization of the Entropies of Multidimensional Shifts of Finite Type

Michael Hochman·Tom Meyerovitch
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Abstract

We show that the values of entropies of multidimensional shifts of finite type (SFTs) are characterized by a certain computation-theoretic property: a real number $h\geq 0$ is the entropy of such an SFT if and only if it is right recursively enumerable, i.e. there is a computable sequence of rational numbers converging to $h$ from above. The same characterization holds for the entropies of sofic shifts. On the other hand, the entropy of an irreducible SFT is computable.

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Michael Hochman, Tom Meyerovitch. 2007-03-07. A Characterization of the Entropies of Multidimensional Shifts of Finite Type. https://doi.org/10.4007/annals.2010.171.2011

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