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The aperiodic domino problem in higher dimension. (English) Zbl 07836586

Berenbrink, Petra (ed.) et al., 39th international symposium on theoretical aspects of computer science, STACS 2022, Marseille, France, virtual conference, March 15–18, 2022. Wadern: Schloss Dagstuhl – Leibniz Zentrum für Informatik. LIPIcs – Leibniz Int. Proc. Inform. 219, Article 19, 15 p. (2022).
Summary: The classical Domino problem asks whether there exists a tiling in which none of the forbidden patterns given as input appear. In this paper, we consider the aperiodic version of the Domino problem: given as input a family of forbidden patterns, does it allow an aperiodic tiling? The input may correspond to a subshift of finite type, a sofic subshift or an effective subshift.
[A. Grandjean et al., LPIcs – Leibniz Int. Proc. Inform. 107, Article 128, 13 p. (2018; Zbl 1499.68109)] proved that this problem is co-recursively enumerable (\(\Pi_0^1\)-complete) in dimension 2 for geometrical reasons. We show that it is much harder, namely analytic (\(\Sigma_1^1\)-complete), in higher dimension: \(d\geq 4\) in the finite type case, d \(\geq 3\) for sofic and effective subshifts. The reduction uses a subshift embedding universal computation and two additional dimensions to control periodicity. This complexity jump is surprising for two reasons: first, it separates 2- and 3-dimensional subshifts, whereas most subshift properties are the same in dimension 2 and higher; second, it is unexpectedly large.
For the entire collection see [Zbl 1482.68007].

MSC:

68Qxx Theory of computing

Citations:

Zbl 1499.68109