Our honourary guest was Helmut Hofer from the Institute for Advanced Study.
This meeting marked the 20th anniversary of the publication of the paper The Topology of Symplectic Maps by Helmut Hofer, where he introduced a remarkable metric on the group of Hamiltonian diffeomorphisms of a symplectic manifold. This metric is now known as the Hofer metric and is a classical notion of symplectic geometry. Hofer geometry has been extensively investigated for the last 20 years, but still there are many open problems.
