Margherita Sandon (Stasbourg) will speak in the geometry seminar at 2pm on Tuesday 21st May, in the Salle des Profs (9th floor, building NO). **Please note the unusual day!** Margherita’s title is “Contact non-squeezing at large scale via generating functions” and her abstract is below.

*The symplectic non-squeezing theorem, discovered by Gromov in 1985, has been the first result showing a fundamental difference between symplectic transformations and volume preserving ones. A similar but more subtle phenomenon in contact topology was found by Eliashberg, Kim and Polterovich in 2006, and refined by Fraser in 2016 and Chiu in 2017: in this case non-squeezing depends on the size of the domains, and only appears above a certain quantum scale. In my talk I will outline a proof of this general contact non-squeezing theorem using generating functions, a classical method based on finite dimensional Morse theory. This is a joint work with Maia Fraser and Bingyu Zhang.*