Itérés d'opérateurs elliptiques dégénérés et applications
Sur certains sous-ensembles de , on caractérise les fonctions de classe , les fonctions analytiques et des fonctions de type Gevrey, par leurs distances aux polynômes dans ou dans l’espace des fonctions continues.
Necessary and sufficient conditions for local embeddability of abstract structures are expressed in terms of the commutation of the vector fields with a complex Lie algebra. These results extend to more general systems.
We give general sufficient conditions to guarantee that a given subgroup of the group of diffeomorphisms of a smooth or real-analytic manifold has a compatible Lie group structure. These results, together with recent work concerning jet parametrization and complete systems for CR automorphisms, are then applied to determine when the global CR automorphism group of a CR manifold is a Lie group in an appropriate topology.
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