Global Hypoellipticity for First-Order Operators on Closed Smooth Manifolds

Fernando de Ávila Silva, Alexandre Kirilov, Todor Gramchev

The main goal of this paper is to address global hypoellipticity issues for the following class of operators: $L=D_t+C(t,x,D_x)$, where $(t,x)\in \mathbb{T}\times M$, $\mathb…