Computing (or not) Quasi-Periodicity Functions of Tilings
Abstract
We know that tilesets that can tile the plane always admit a quasi-periodic tiling [4, 8], yet they hold many uncomputable properties [3, 11, 21, 25]. The quasi-periodicity function is one way to measure the regularity of a quasi-periodic tiling. We prove that the tilings by a tileset that admits only quasi-periodic tilings have a recursively (and uniformly) bounded quasi-periodicity function. This corrects an error from [6, theorem 9] which stated the contrary. Instead we construct a tileset for which any quasi-periodic tiling has a quasi-periodicity function that cannot be recursively bounded. We provide such a construction for 1-dimensional effective subshifts and obtain as a corollary the result for tilings of the plane via recent links between these objects [1, 10].
Keywords
Cite
@article{arxiv.1012.1222,
title = {Computing (or not) Quasi-Periodicity Functions of Tilings},
author = {Alexis Ballier and Emmanuel Jeandel},
journal= {arXiv preprint arXiv:1012.1222},
year = {2010}
}
Comments
Journ\'ees Automates Cellulaires 2010, Turku : Finland (2010)