Vincent Colin (Université de Nantes) will speak in the geometry seminar on the 24th November. The talk will take place at 10.30am and the room wll be communicated soon. **Please note the unusual day (Friday) and unsusual time, which is earlier than usual!** Vincent’s title is “Topological entropy of the Reeb vector field” and his abstract is below.

We show, via the use of open book decompositions, that on almost every contact 3-manifold, every Reeb vector field has positive topological entropy. This is a joint work with Marcelo Alves and Ko Honda.