Renaud Leplaideur (Université de la Nouvelle-Calédonie)
Abstract: I will present a new object, called substreetution, which is an extension of substitutions in dynamics (Z-action) to colored trees (free-group action). The main part of the talk will be devoted to explain the motivations to define and study such an object. Final part will focus on results obtained for the "Jacaranda tree" and I shall present (many) open questions.
