Lectures on invariants, representations and lie algebras in systems and control theory.- Series de Poincare dans la theorie des invariants.- On the cohomology of locally symmetric hermitian spaces.- A study of the torsion-free part of the cokernel from the operator acting on a D n-module.- The regular representations of the tame hereditary algebras.- Separating tubular series.- Higher even clifford algebras.- Modifications monomiales.- La serie de bass d'un produit fibre d'Anneaux locaux.- Relative invariants for commutative rings.- Sur l'Extension RG ? R.- Modules sur les anneaux de Krull non commutatifs.- Localization of crossed-modules.- The division ring of fractions of a group ring.