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Minimal Gevrey Regularity for Hörmander Operators
Antonio Bove, Marco Mughetti
Source abstract
Abstract We prove a minimal Gevrey regularity theorem for Hörmander’s sum of squares type operators ( 1.1), improving the result of Derridj and Zuily [ 10]. The Gevrey index given here is optimal, in the sense that there are operators of this type that just attain that regularity and not any better.
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