Non-isotropic Gevrey Hypoellipticity for Grushin Operators
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We shall determine non-isotropic Gevrey exponents for general Grushin operators based on the results given in the paper , where a method to determine isotropic (worst) Gevrey exponents was given. The ideas of the bracket calculus given in the paper  and FBI-transformation given in the paper  are also useful.
- Publications of the Research Institute for Mathematical Sciences
Publications of the Research Institute for Mathematical Sciences 38(2), 289-319, 2002