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Pseudo-differential operators and hypoellipticity. (English) Zbl 0262.35007

Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 61-69 (1973).

MSC:

35H10 Hypoelliptic equations
35S05 Pseudodifferential operators as generalizations of partial differential operators
58J40 Pseudodifferential and Fourier integral operators on manifolds