Date & Time: Friday, March 20, 2015, 15:30-16:30.
Venue: Ramanujan Hall
Title: Tamari lattice and its extensions
Speaker: Xavier G. Viennot, University of Bordeaux
Abstract: The vertices of the Tamari lattice are binary trees with an order relation defined by a rotation on binary trees. Such a lattice can be realized geometrically as a convex polyhedron, called the associahedron. I will begin with a survey of this active subject and then will give some extensions of the Tamari lattice in relation with the so-called rational Catalan combinatorics and higher diagonal coinvariants (joint work with L.-F. Préville-Ratelle).