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Une généralisation du théorème de Cobham

S. Fabre (1994)

Acta Arithmetica

Nous généralisons le théorème de Cobham ([2]), en démontrant qu'une partie infinie de ℕ est reconnaissable en base k (k entier strictement plus grand que un) et reconnaissable dans un système de numération associé à un nombre de Pisot unitaire (ayant une propriété arithmétique supplémentaire) si et seulement si elle est ultimement périodique.

Uniformly bounded duplication codes

Peter Leupold, Victor Mitrana (2007)

RAIRO - Theoretical Informatics and Applications

Duplication is the replacement of a factor w within a word by ww. This operation can be used iteratively to generate languages starting from words or sets of words. By undoing duplications, one can eventually reach a square-free word, the original word's duplication root. The duplication root is unique, if the length of duplications is fixed. Based on these unique roots we define the concept of duplication code. Elementary properties are stated, then the conditions under which infinite duplication...

Unique decipherability in the additive monoid of sets of numbers

Aleksi Saarela (2011)

RAIRO - Theoretical Informatics and Applications

Sets of integers form a monoid, where the product of two sets A and B is defined as the set containing a+b for all a A and b B . We give a characterization of when a family of finite sets is a code in this monoid, that is when the sets do not satisfy any nontrivial relation. We also extend this result for some infinite sets, including all infinite rational sets.

Unique decipherability in the additive monoid of sets of numbers

Aleksi Saarela (2011)

RAIRO - Theoretical Informatics and Applications

Sets of integers form a monoid, where the product of two sets A and B is defined as the set containing a+b for all a A and b B . We give a characterization of when a family of finite sets is a code in this monoid, that is when the sets do not satisfy any nontrivial relation. We also extend this result for some infinite sets, including all infinite rational sets.

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