Involutivity degree of a distribution at superdensity points of its tangencies
Silvano Delladio (2021)
Archivum Mathematicum
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Let (with ) be vector fields of class in an open set , let be a -dimensional submanifold of and define where is the tangent space to at . Then we expect the following property, which is obvious in the special case when is an interior point (relative to ) of : If is a -density point (relative to ) of then all the iterated Lie brackets of order less or equal to belong to . Such a property has been proved in [9] for and its proof in the...