Algèbre et géométrie

Le séminaire sera dans salle W et retransmis sur Zoom : https://us02web.zoom.us/j/83495836865 Meeting ID: 834 9583 6865 Mot de passe: G est un Graphe de Cayley du groupe libre à 107 générateurs. Quel est le degré de ce graphe? Tapez le numéro à trois chiffres comme un mot de passe. 14.00 -- 14.45 Alex Eskin (University of Chicago), On a theorem of Furstenberg 15.00 -- 15.45 (CANCELLED!) Alex Gamburd (Graduate Center, CUNY), Arithmetic and Dynamics on Varieties of Markoff Type 15.00 -- 15.45 Vadim Kaimanovich (University of Ottawa), Limit distributions […]

Le séminaire sera dans salle W et retransmis sur Zoom : https://us02web.zoom.us/j/82734674940 Meeting ID: 827 3467 4940 Mot de passe: G est un Graphe de Cayley du groupe libre à 107 générateurs. Quel est le degré de ce graphe? Tapez le numéro à trois chiffres comme un mot de passe.   14.00 -- 14.45 Jingyin Huang (Ohio State University), Labeled four wheels and the K(pi,1) problem for reflection arrangement complements 15.00 -- 15.45 Corentin Bodard (University of Geneva), Intermediate geodesic growth in virtually nilpotent groups 16.00 -- 16.45 Lopez Neumann […]

14.00 -- 14.45 Timothée Bénard (University of Warwick), "Limit theorems on nilpotent Lie groups". 15.00 -- 15.45 Panagiotis Tselekidis (ENS Paris),  "Asymptotic dimension of finitely generated groups". 16.15 -- 17.00 Andrey Alpeev (ENS Paris), "Invariant random order extension and amenability".

Nomember 15 (wednesday, unusual day)   14.00-14.45 Simon André (Paris VI)  "Sharply 2-transitive infinite finitely generated simple groups". 15.00-15.45  Ruiwen Dong (Saarland University)  "Decision problems in sub-semigroups of metabelian groups". 16.00-16.45  Emmanuel Rauzy (Munich University)  "Groups with presentations in EDT0L".   Simon André  "Sharply 2-transitive infinite finitely generated simple groups". A group G is said to be sharply 2-transitive if it has an action on a set X with at least 2 elements such that, for all pairs (x, x') and (y, y') of distinct elements in X, there exists […]

December  13 (wednesday, unusual day) 14.00--14.45 Reem Yassawi (Queen Mary University of London) "Tame or wild Toeplitz shifts" 15.00--15.45 Todor Tsankov (Lyon 1) "Gleason complete flows of locally compact groups" 16.15--17.00 Johannes Kellendonk (Lyon 1) "Which algebraic components of the Ellis semigroup of a non-tame dynamical system are especially big?" Reem Yassawi     "Tame or wild Toeplitz shifts" The Ellis semigroup E(X, T) of a topological dynamical system is defined to be the compactification of the action T in the topology of pointwise convergence on the space of all […]

January 31 (wednesday)   14.00 - 14.45 Valérie Berthé (Paris VII),  "Dendric subshifts  and groups" 15.00 - 15.45  Nguyen-Bac Dang, (Orsay) , "Variation of the Hausdorff dimension of limits set and degenerating Schottky groups" 16.15 - 17.00  Bruno Duchesne (Orsay), TBA   Valérie Berthé,   "Dendric subshifts  and groups"   We discuss a family of  symbolic dynamical systems  that have remarkable  group properties, the family of dendric words. This family  includes numerous classical families of   symbolic dynamical systems,   among others codings of interval exchanges. Their return words  form […]