Speaker: Karsten Matthies Title: A semigroup approach to the justification of kinetic theory Abstract: A crucial question in the understanding of many particle system is the validity of effective continuum descriptions. The talk reports on a semigroup method developed to rigorously show the validity of Boltzmann-type descriptions for various deterministic dynamics of n hard spheres of diameter a with random initial data. Joint work with George Stone and Florian Theil.