Prefer a chat interface with context about you and your work?
Lower order perturbation and global analytic vectors for a class of globally analytic hypoelliptic operators
In this work we return to the class of globally analytic hypoelliptic Hörmanderâs operators defined on the $N$-dimensional torus introduced by Cordaro and Himonas and prove that if $P$ is any operator in this class, then a perturbation of $P$ by an analytic pseudodifferential operator with degree smaller than the …