
doi: 10.5802/jtnb.422
The aim of this article is to study certain combinatorial properties of infinite binary and ternary words associated to cut-and-project sequences. We consider here the cut-and-project scheme in two dimensions with general orientation of the projecting subspaces. We prove that a cut-and-project sequence arising in such a setting has always either two or three types of distances between adjacent points. A cut-and-project sequence thus determines in a natural way a symbolic sequence (infinite word) in two or three letters. In fact, these sequences can be constructed also by a coding of a 2 - or 3 -interval exchange transformation. According to the complexity the cut-and-project construction includes words with complexity n + 1 , n + const. and 2 n + 1 . The words on two letter alphabet have complexity n + 1 and thus are Sturmian. The ternary words associated to the cut-and-project sequences have complexity n + const. or 2 n + 1 . A cut-and-project scheme has three parameters, two of them specifying the projection subspaces, the third one determining the cutting strip. We classify the triples that correspond to combinatorially equivalent infinite words.
Combinatorics on words, cut-and-project sequences, three-interval exchanges, Sturmian sequences
Combinatorics on words, cut-and-project sequences, three-interval exchanges, Sturmian sequences
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