aSection de Mathématiques, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland;bSection de Mathématiques, et Centre Bernouilli, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Abstract:
The existence of invariant generators for distributions satisfying a compatibility condition with the symmetry algebra is proved.