Dimension minimale des orbites d'une action de ℝn sur une variété de contact

Abstract:

By differentiability we means C ^∞ differentiability. Recall that the span of a manifold M is the maximum number of linearly independent vector fields in every point. The aim of this paper is to relate the span of M with the minimal dimension of the orbits of a differentiable action ϕ:ℝ ⁿ ×M→M that keeps a contact structure.