The global description of locally linear systems.- Global properties of the root-locus map.- Group action and differential operators.- Some factorizations at infinity of rational matrix functions and their control interpretation.- Some topological properties of electrical machines.- Finite-dimensional observation-spaces for non-linear systems.- Polynomial models and algebraic stability criteria.- Linear system factorization.- Controlled invariance in systems over rings.- Control and filtering of a class of nonlinear but ¿homogeneous¿ systems.- Construction of formal and analytic realizations of nonlinear systems.- (Ad f, G) Invariant and controllability distributions.- Schur techniques for riccati differential equations.- Toward a theory of nonlinear stochastic realization.- Burning grass and floating corks.- Supervisory control of discrete event