Cardinality of Rauzy classes

Delecroix, Vincent

Annales de l'Institut Fourier, Tome 63 (2013) no. 5, pp. 1651-1715.

Les classes de Rauzy forment des partitions de l’ensemble des permutations irréductibles. Elles ont été introduites par G. Rauzy dans l’étude d’un algorithme de renormalisation des échanges d’intervalles. Nous démontrons une formule explicite pour la cardinalité de chaque classe de Rauzy. La preuve que nous développons utilise une interprétation géométrique des permutations et des classes de Rauzy en termes de surfaces de translation et d’espace de modules.

Rauzy classes form a partition of the set of irreducible permutations. They were introduced as part of a renormalization algorithm for interval exchange transformations. We prove an explicit formula for the cardinality of each Rauzy class. Our proof uses a geometric interpretation of permutations and Rauzy classes in terms of translation surfaces and moduli spaces.

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