Directive words of episturmian words: equivalences and normalization

Episturmian morphisms constitute a powerful tool to study episturmian words. Indeed, any episturmian word can be infinitely decomposed over the set of pure episturmian morphisms. Thus, an episturmian word can be defined by one of its morphic decompositions or, equivalently, by a certain directive wo...

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Veröffentlicht in:RAIRO. Informatique théorique et applications 2009-04, Vol.43 (2), p.299-319
Hauptverfasser: Glen, Amy, Levé, Florence, Richomme, Gwénaël
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Sprache:eng
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Zusammenfassung:Episturmian morphisms constitute a powerful tool to study episturmian words. Indeed, any episturmian word can be infinitely decomposed over the set of pure episturmian morphisms. Thus, an episturmian word can be defined by one of its morphic decompositions or, equivalently, by a certain directive word. Here we characterize pairs of words directing the same episturmian word. We also propose a way to uniquely define any episturmian word through a normalization of its directive words. As a consequence of these results, we characterize episturmian words having a unique directive word.
ISSN:0988-3754
1290-385X
DOI:10.1051/ita:2008029