A dynamical approach to compactify the three dimensional Lorentz group.
A Periodic Flow with Infinite Epstein Hierarchy.
A sufficient condition for a group of homeomorphisms to be affine.
Actions localement libres du groupe affine.
Algebraic Hulls and the Folner Property.
An elementary proof of a Lima's theorem for surfaces.
An elementary proof of the following theorem is given:THEOREM. Let M be a compact connected surface without boundary. Consider a C∞ action of Rn on M. Then, if the Euler-Poincaré characteristic of M is non zero there exists a fixed point.
Asymptotic Properties of Foliations
Automorphism Groups of Second Order Differential Equations.