Non-isotropic Gevrey hypoellipticity for Grushin operators.
Summary: We determine non-isotropic Gevrey exponents for general Grushin operators based on the results given earlier, where a method to determine isotropic (worst) Gevrey exponents was given. The ideas of the bracket calculus of Bove-Tartakoff and FBI-transformation are also useful.
scientific article; zbMATH DE number 1833277
scientific article