Monadic second-order logic and the domino problem on self-similar graphs
Laurent Bartholdi
Universität des Saarlandes, Saarbrücken, Germany
Abstract
We consider the domino problem on Schreier graphs of self-similar groups, and more generally their monadic second-order logic. On the one hand, we prove that if the group is bounded, then the domino problem on the graph is decidable; furthermore, under an ultimate periodicity condition, all its monadic second-order logic is decidable. This covers, for example, the Sierpiński gasket graphs and the Schreier graphs of the Basilica group. On the other hand, we prove undecidability of the domino problem for a class of self-similar groups, answering a question by Barbieri and Sablik, and study some examples including one of linear growth.
Cite this article
Laurent Bartholdi, Monadic second-order logic and the domino problem on self-similar graphs. Groups Geom. Dyn. 16 (2022), no. 4, pp. 1423–1459
DOI 10.4171/GGD/689