Abstract
We study a class of sum of squares exhibiting the same Poisson-Treves stratification as the Oleinik-Radkevič operator. We find three types of operators having distinct microlocal structures. For one of these we prove a Gevrey hypoellipticity theorem analogous to our recent result for the corresponding Oleinik-Radkevič operator.
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Communicated by Steven Bell
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Bove, A., Tartakoff, D. A class of sums of squares with a given Poisson-Treves stratification. J Geom Anal 13, 391–420 (2003). https://doi.org/10.1007/BF02922052
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DOI: https://doi.org/10.1007/BF02922052