A Class of Sums of Squares with a Given Poisson-Treves Stratification

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116699We 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.39 ppAnalysis of PDEs35H10, 35A27A Class of Sums of Squares with a Given Poisson-Treves Stratificationtext