Über die Hypoelliptizität einer gewissen Klasse von Pseudodifferentialsystemen. (Russian) Zbl 0396.35016
MSC:
35H10 | Hypoelliptic equations |
35S05 | Pseudodifferential operators as generalizations of partial differential operators |
35H10 | Hypoelliptic equations |
35S05 | Pseudodifferential operators as generalizations of partial differential operators |