Part of the Trends in Mathematics book series (TM)
A Note on Kohn’s and Christ’s Examples
We give here a family of second order examples tailored to those by Kohn and by Christ, which are (C ) hypoelliptic and lose an arbitrarily large (fixed) number of derivatives.
KeywordsLocalize Operator Symplectic Manifold Complex Vector Hermite Operator Principal Symbol
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© Birkhäuser Verlag Basel/Switzerland 2006