**Abstract:**

In this talk, I will expose a work with Vincent Laheurte and Roberta Bianchini which revisits the classical issue of the controllability/observability cost of linear first order evolution systems, starting with ODEs, before to turn to some linear first order evolution PDEs in several space dimensions, including hyperbolic systems and pseudo-differential systems obtained by linearization in fluid mechanics. In particular we investigate the cost of localized initial data, and in the dispersive case, of initial data which are semi-classically microlocalized.

**Biography:**

After a PhD thesis in Marseille in 2005 (on the characteristic boundary layers which appear in the vanishing viscosity limit), Franck Sueur held an associate professor position at the University of Paris 6 from 2006 to 2014 and then moved to the University of Bordeaux. He was a Junior member of the Institut Universitaire de France from 2018 to 2023.

*Seminar by the NYU-ECNU Institute of Mathematical Sciences at NYU Shanghai*

**This event is open to the NYU Shanghai community and Math community.**