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Factor Complexity of Infinite Words Associated with Non-Simple Parry Numbers

  • Karel Klouda and Edita Pelantová
Published/Copyright: August 20, 2009
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Integers
From the journal Volume 9 Issue 3

Abstract

The factor complexity of the infinite word uβ canonically associated with a non-simple Parry number β 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 uβ only. To complete the description of their special factors, we define and study (a, b)-maximal left special factors. This enables us to characterize non-simple Parry numbers β for which the word uβ has affine complexity.

Received: 2008-10-31
Accepted: 2009-02-13
Published Online: 2009-08-20
Published in Print: 2009-August

© de Gruyter 2009

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