Fractional parts of powers and Sturmian words

Bugeaud, Yann; Dubickas, Artūras

doi:10.1016/j.crma.2005.06.007

Geodesic

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Number Theory

Fractional parts of powers and Sturmian words
[Parties fractionnaires de puissances et mots sturmiens]

Présenté par : Jean-Pierre Kahane

Bugeaud, Yann ¹ ; Dubickas, Artūras ²

¹ Université Louis-Pasteur, UFR de mathématiques, 7, rue René-Descartes, 67084 Strasbourg, France
² Department of Mathematics and Informatics, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania

Comptes Rendus. Mathématique, Tome 341 (2005) no. 2, pp. 69-74.

Voir la notice de l'article provenant de la source Numdam

Abstract (VO)
Résumé

Let $b ⩾ 2$ be an integer. In terms of combinatorics on words we describe all irrational numbers $ξ > 0$ with the property that the fractional parts ${ξ b^{n}}$ , $n ⩾ 0$ , all belong to a semi-open or an open interval of length $1 / b$ . The length of such an interval cannot be smaller, that is, for irrational ξ, the fractional parts ${ξ b^{n}}$ , $n ⩾ 0$ , cannot all belong to an interval of length smaller than $1 / b$ .

Soit $b ⩾ 2$ un entier. Au moyen de résultats de la combinatoire des mots, nous caractérisons l'ensemble des nombres réels $ξ > 0$ tels que les parties fractionnaires ${ξ b^{n}}$ , $n ⩾ 0$ , appartiennent toutes à un intervalle semi-ouvert ou ouvert de longueur $1 / b$ . La longueur d'un tel intervalle ne peut pas être plus petite, c'est-à-dire, quel que soit le nombre irrationnel ξ, aucun intervalle de longueur strictement inférieure à $1 / b$ ne contient toutes les parties fractionnaires ${ξ b^{n}}$ , $n ⩾ 0$ .

Reçu le : 2005-05-24
Accepté le : 2005-05-31
Publié le : 2005-06-29

DOI : 10.1016/j.crma.2005.06.007

Affiliations des auteurs :

Bugeaud, Yann ¹ ; Dubickas, Artūras ²

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Bugeaud, Yann; Dubickas, Artūras. Fractional parts of powers and Sturmian words. Comptes Rendus. Mathématique, Tome 341 (2005) no. 2, pp. 69-74. doi : 10.1016/j.crma.2005.06.007. http://geodesic.mathdoc.fr/articles/10.1016/j.crma.2005.06.007/

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Cité par Sources :

^⁎ The research of the first named author was supported by the Austrian Science Foundation FWF, grant M822-N12. The research of the second named author was partially supported by the Lithuanian State Science and Studies Foundation.