Geometry and Topology : III Latin American School of Mathematics Proceedings of the School held at the Instituto de Matemática Pura e Aplicada CNPg Rio de Janeiro July 1976 Evaluation of some Maunder cohomology operations Construction geometrique de certaines series discretes The point spectrum of the adjoint of an automorphism of a vector bundle Whitney duality and singularities of projections Orbit preserving diffeomorphisms and the stability of Lie group actions and singular foliations On minimal immersions with parallel normal curvature tensor Circle bundles A topology for the space of foliations Stability of compact foliations Secondary operations in K theory and the generalized vector field problem On holomorphic solutions of certain kind of pfaffian systems with singularities Scattering problems in differential geometry The connected components of Morse Smale vector fields on two manifolds Feuilletages En Cylindres Mesure de Lebesgue et Nombre de Rotation The Godbillon Vey invariant of foliations by planes of T3 On the construction of the trace in serre duality Localization theories for groups and homotopy types On hyperbolic attractors of codimension one On Liénards equation On the Weierstrass preparation theorem Reduction of semilinear parabolic equations to finite dimensional C1 flows Axiom a for endomorphisms Characterizations of AS diffeomorphisms Structural stability of integrable differential forms Accessibility of an optimum The scattering problem for some particle systems on the line Proof of a generalized from of a fixed point theorem due to G. D. Birkhoff Some developments on stability and bifurcations of dynamical systems Convexity and tightness of manifolds with boundary Existence of brake orbits in Finsler mechanical systems On the complex projective bundle construction Symmetries conservation laws and variational principles Classification of generic quadratic vector fields with no limit cycles The classifying ring of SL(2 C) On the finite solvability of Plateaus problem The set of curves of uniqueness for Plateaus problem has a dense interior Geometric properties of generic differentiable manifolds A catastrophe model for the stability of ships Note on smoothing symplectic and volume preserving diffeomorphisms A simple proof of a generalization of a theorem by C. L. Siegel.