## Two-dimensional iterated morphisms and discrete planes.(English)Zbl 1068.37004

Summary: Iterated morphisms of the free monoid are very simple combinatorial objects which produce infinite sequences by replacing iteratively letters by words. The aim of this paper is to introduce a formalism for a notion of two-dimensional morphisms; we show that they can be iterated by using local rules, and that they generate two-dimensional patterns related to discrete approximations of irrational planes with algebraic parameters. We associate such a two-dimensional morphism with any usual Pisot unimodular one-dimensional iterated morphism over a three-letter alphabet.

### MSC:

 37B10 Symbolic dynamics 05A05 Permutations, words, matrices 05B25 Combinatorial aspects of finite geometries 37B50 Multi-dimensional shifts of finite type, tiling dynamics (MSC2010) 68R15 Combinatorics on words
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### References:

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