Step-s involutive families of vector fields, their orbits and the Poincaré inequality
arXiv:1106.2410 · doi:10.1016/j.matpur.2012.09.005
Abstract
We consider a family of vector fields satisfying a suitable higher order involutivity condition. We discuss the definition of commutators, the regularity of Sussmann's orbits and the Poincaré inequality.
Added Section 5