Fonction complexit\'e associ\'ee \`a une application ergodique du tore
Abstract
In this article we give the optimal lower bound for the complexity function of a planar translation which induces an ergodic rotation of the torus R2 / Z2. In addition, we give an explicit calculation of this complexity for the application (x,y) (x+1/φ2,y+x-1/ (2φ3)), where φ is the golden mean. Nous proposons dans ce travail de minorer de mani\`ere optimale la fonction complexit\'e associ\'ee \`a une translation du plan, qui induit une rotation ergodique du tore R2/ Z2. De plus, nous donnons un calcul explicite de cette complexit\'e pour l'application (x,y)(x+1/φ2,y+x-1/(2φ3)), o\`u φ d\'esigne le nombre d'or.
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