Necessary conditions for tiling finitely generated amenable groups

Benjamin Hellouin de Menibus; Hugo Maturana Cornejo

doi:10.3934/dcds.2020116

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2020, Volume 40, Issue 4: 2335-2346. Doi: 10.3934/dcds.2020116

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Necessary conditions for tiling finitely generated amenable groups

Benjamin Hellouin de Menibus^1, , , and
Hugo Maturana Cornejo^2,

1.
Laboratoire de Recherche en Informatique, Université Paris-Sud - CNRS - CentraleSupélec, Université Paris-Saclay, France
2.
Departamento de Ingeniería Matemática, DIM-CMM, Universidad de Chile, Chile

^* Corresponding author: Benjamin Hellouin de Menibus
^* Corresponding author: Benjamin Hellouin de Menibus

Received: June 30, 2019

Published: December 2019

This article was written during stays of the first author funded by an LRI internal project. The second author was partially funded by the ECOS-SUD project C17E08, the ANR project CoCoGro (ANR-16-CE40-0005) and CONICYT doctoral fellowship 21170770

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Abstract

We consider a set of necessary conditions which are efficient heuristics for deciding when a set of Wang tiles cannot tile a group.

Piantadosi [19] gave a necessary and sufficient condition for the existence of a valid tiling of any free group. This condition is actually necessary for the existence of a valid tiling for an arbitrary finitely generated group.

We consider two other conditions: the first, also given by Piantadosi [19], is a necessary and sufficient condition to decide if a set of Wang tiles gives a strongly periodic tiling of the free group; the second, given by Chazottes et. al. [9], is a necessary condition to decide if a set of Wang tiles gives a tiling of $ \mathbb Z^2 $.

We show that these last two conditions are equivalent. Joining and generalising approaches from both sides, we prove that they are necessary for having a valid tiling of any finitely generated amenable group, confirming a remark of Jeandel [14].

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Mathematics Subject Classification: Primary: 37B50; Secondary: 37B10, 05B45.

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Figure 1. Examples of Wang tiles with colours $ \mathcal{C} = \left\{ {a,b,c,d} \right\}$ on one and two generators, respectively, with their corresponding maps

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