E. Militon explained to the Groupe de travail de théorie ergodique in Orsay the following result. Let be a group. Given and , the length is the minimum length of a product of elements of equal to (possibly ). Definition. is a distortion element if there exists a finite subset , such that . Let [...]
Posts Tagged ‘group actions’
E. Militon: Distortion elements in groups of smooth diffeomorphisms
Posted in Dynamics, talks, tagged group actions, smooth dynamics on June 7, 2010 | Leave a Comment »
T. Fisher: Diffeomorphisms with Trivial Centralizers
Posted in Dynamics, talks, tagged centralizers, genericity, group actions, hyperbolicity, smooth dynamics, smoothness on June 3, 2010 | Leave a Comment »
A major part of dynamical system theory studies the iteration of diffeomorphisms under various assumptions, geometric or analytic or otherwise. It is also interesting to study them collectively. In particular, , the set of diffeomorphisms of some manifold and some number , is a group. It is for instance of interest to know when it [...]
Dynamique de pseudo-groupes discrets agissant de façon expansive et holomorphe
Posted in Dynamics, talks, tagged complex dynamics, group actions, pseudo groups on December 6, 2009 | Leave a Comment »
Bertrand DEROIN a présenté une extension au cadre holomorphe d’un théorème de Duminy (dont une preuve figure dans le livre d’A. Navas). Un pseudo-groupe agissant sur un espace topologique est une collection d’homéomorphisme entre ouverts de stable par composition, inversion et restriction. Théorème (B. Deroin). Considérons un pseudo-groupe agissant de façon holomorphe, discrète et expansive [...]
Première Journée Affine par Morceaux
Posted in Meetings, tagged Dynamics, entropy, group actions, piecewise affine dynamics, symbolic dynamics, topological dynamics on February 23, 2009 | Leave a Comment »
Elle aura bien lieu le jeudi 7 mai à l’Institut Henri Poincaré, Amphithéatre Darboux: voir ici. Merci de vérifier votre inscription et de vous inscrire ou désinscrire selon le cas.
