Dear All, Next week, Friday March 13, Bob Rink (Vrije Universiteit Amsterdam) will give a talk in Carslaw 175 at 4pm on Title: Aubry-Mather theory for twist maps and monotone recurrence relations Abstract: In this talk I will try to provide an elementary introduction to Aubry-Mather theory. Aubry-Mather theory can be described as a variational method for finding quasi-periodic solutions of Hamiltonian twist maps and monotone recurrence relations. We will start with reviewing elementary results on circle homeomorphisms and then move on to more to more complicated problems. I will end with a theorem of Blaz Mramor and myself on the non-existence of invariant quasi-periodic solutions (a so-called "converse KAM theorem"). Hope to see you all there, Lachlan