Analytic and Gevrey regularity for certain sums of two squares in two variables

Smoothness and regularity of solutions to PDEs (35B65) Analyticity in context of PDEs (35A20) Microlocal methods and methods of sheaf theory and homological algebra applied to PDEs (35A27) Hypoelliptic equations (35H10) Subelliptic equations (35H20)

Cites Work

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Analytic regularity for solutions to sums of squares: an assessment
A new proof of Okaji's theorem for a class of sum of squares operators
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The local real analyticity of solutions to d'Alembert-Operator(b) and the (partial d)--Neumann problem
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ANALYTIC HYPOELLIPTICITY FOR SUMS OF SQUARES IN THE PRESENCE OF SYMPLECTIC NON TREVES STRATA
Gevrey hypoellipticity for sums of squares of vector fields in $ \R^2 $ with quasi-homogeneous polynomial vanishing
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A Class of Bounded Pseudo-Differential Operators
ON A CLASS OF HYPOELLIPTIC OPERATORS

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