The Hypoellipticity and Parametrices for a Class of Nonprincipal Type LPDOs

Abstract

In this paper, we employ the method of increment operators, by means of the left invariant operators £^{v,s} on nilpotent Lie group G^{d_1+d_2} and the calculus of v- &PsiDOs, to discuss the hypoellipticity for a class of nonprincipal type LPDOs £ on a d_1 + d_2 dimensional manifold M. For those hypoelliptic £ we also construct their parametrices.