Symmetries and covariant representations -- Jump processes and applications to the trigonometric interaction -- Generalized homomorphisms between C*-algebras and KK-theory -- Global equilibria and steady states of discrete networks, according to classical thermodynamics -- Completeness of three body quantum scattering -- Mathematical structure in quantum field theory -- Hydrodynamik gekoppelter diffusionen: Fluktuationen im gleichgewicht -- Superrenormalizable infra red theories -- Un modele d'univers confronte aux observations -- Almost mathieu equation for small and big coupling constants -- Periodic solutions of hamiltonian equations