On a trace functional for formal pseudo-differential operators and the Hamiltonian structure of korteweg-devries types equations.- A remark on a generalized uncertainty principle.- Dissipative dynamical systems of macroscopic physics.- On the prevalence of aperiodicity in simple systems.- On the geometry of the Liapunov-Schmidt procedure.- Integrable systems and algebraic curves.- On the eigenvalues of a class of hypoelliptic operators II.- On the smoothness of the time t-map of the KdV equation and the bifurcation of the eigenvalues of Hill's operator.- Self-dual Yang-Mills fields.- About isospectral deformations of discrete laplacians.- Bifurcations of periodic orbits in autonomous systems.