The next informal seminar will be given by Roman Golovko, with the title *“A gentle introduction to Legendrian submanifolds towards Arnold-type estimates”*. The talk will take place on Tuesday 20th September 10-12, in the Salle de Profs, (mathematics department, on the 9th floor of building NO, Campus de la Plaine). Roman’s abstract is below.

We give a short introduction to Legendrian submanifolds of a contact manifold, their classical and modern invariants, and the notion of a Lagrangian cobordism. At the end of the talk, we will discuss several Arnold-type estimates.