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Directive words of episturmian words : equivalences and normalization

Amy GlenFlorence LevéGwénaël Richomme — 2009

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

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...

Directive words of episturmian words: equivalences and normalization

Amy GlenFlorence LevéGwénaël Richomme — 2008

RAIRO - Theoretical Informatics and Applications

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...

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