Title: Hypoellipticity and eigenvalue asymptotics
Subjects: Asymptotic expansions, Eigenvalues, Hypoelliptic Differential equations, Partial Differential equations, Developpements asymptotiques, Eigenvaleurs, Elliptische Differentialgleichung, Equations aux derivees partielles, Eigenwert, Equations differentielles hypo-elliptiques, Hypoelliptizitat, Partielle Differentialgleichung, Eigenwertproblem