Decidability Problems for Self-induced Systems Generated by a Substitution

  • Timo Jolivet
  • Anne Siegel
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9288)


In this talk we will survey several decidability and undecidability results on topological properties of self-affine or self-similar fractal tiles. Such tiles are obtained as fixed point of set equations governed by a graph. The study of their topological properties is known to be complex in general: we will illustrate this by undecidability results on tiles generated by multitape automata. In contrast, the class of self affine tiles called Rauzy fractals is particularly interesting. Such fractals provide geometrical representations of self-induced mathematical processes. They are associated to one-dimensional combinatorial substitutions (or iterated morphisms). They are somehow ubiquitous as self-replication processes appear naturally in several fields of mathematics. We will survey the main decidable topological properties of these specific Rauzy fractals and detail how the arithmetic properties of the substitution underlying the fractal construction make these properties decidable. We will end up this talk by discussing new questions arising in relation with continued fraction algorithm and fractal tiles generated by S-adic expansion systems.


Product Family Iterate Function System Markov Partition Sturmian Sequence Discrete Plane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Authors and Affiliations

  1. 1.Université Paul Sabatier, Institut de Mathmatique de ToulouseToulouseFrance
  2. 2.CNRS, Université de Rennes 1, IRISA-UMR 6074RennesFrance
  3. 3.Inria Rennes - Bretagne Atlantique, Team DylissRennesFrance

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