A4 Vertaisarvioitu artikkeli konferenssijulkaisussa
Decidability and Periodicity of Low Complexity Tilings
Tekijät: Jarkko Kari, Etienne Moutot
Toimittaja: Christophe Paul and Markus Blaser
Konferenssin vakiintunut nimi: International Symposium on Theoretical Aspects of Computer Science
Julkaisuvuosi: 2020
Journal: LIPICS – Leibniz international proceedings in informatics
Kokoomateoksen nimi: 37th International Symposium on Theoretical Aspects of Computer Science (STACS 2020)
Tietokannassa oleva lehden nimi: 37TH INTERNATIONAL SYMPOSIUM ON THEORETICAL ASPECTS OF COMPUTER SCIENCE (STACS 2020)
Lehden akronyymi: LEIBNIZ INT PR INFOR
Artikkelin numero: UNSP 14
Vuosikerta: 154
Sivujen määrä: 12
ISBN: 978-3-95977-140-5
ISSN: 1868-8969
DOI: https://doi.org/10.4230/LIPIcs.STACS.2020.14
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/46861540
In this paper we study low-complexity colorings (or tilings) of the two-dimensional grid Z(2). A coloring is said to be of low complexity with respect to a rectangle if there exists m, n is an element of N such that there are no more than mn different rectangular m x n patterns in it. Open since it was stated in 1997, Nivat's conjecture states that such a coloring is necessarily periodic. Suppose we are given at most nm rectangular patterns of size n x m. If Nivat's conjecture is true, one can only build periodic colorings out of these patterns - meaning that if the m x n rectangular patterns of the coloring are among these mn patterns, it must be periodic. The main contribution of this paper proves that there exists at least one periodic coloring build from these patterns. We use this result to investigate the tiling problem, also known as the domino problem, which is well known to be undecidable in its full generality. However, we show that it is decidable in the low-complexity setting. Finally, we use our result to show that Nivat's conjecture holds for uniformly recurrent configurations. The results also extend to other convex shapes in place of the rectangle.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
