Mathematics – Combinatorics
Scientific paper
2008-11-30
Mathematics
Combinatorics
25 pages, 6 figures
Scientific paper
The factor complexity of the infinite word $\ubeta$ canonically associated to a non-simple Parry number $\beta$ is studied. Our approach is based on the notion of special factors introduced by Berstel and Cassaigne. At first, we give a handy method for determining infinite left special branches; this method is applicable to a broad class of infinite words which are fixed points of a primitive substitution. In the second part of the article, we focus on infinite words $\ubeta$ only. To complete the description of its special factors, we define and study $(a,b)$-maximal left special factors. This enables us to characterize non-simple Parry numbers $\beta$ for which the word $\ubeta$ has affine complexity.
Klouda Karel
Pelantová Edita
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