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Une classe d’opérateurs non hypoelliptiques analytiques. (French) Zbl 0419.35022
Sémin. Goulaouic-Schwartz 1978-1979, Équat. dériv. part., Exposé No. 12, 12 p. (1979).

35H10 Hypoelliptic equations
58J40 Pseudodifferential and Fourier integral operators on manifolds
35R20 Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions)
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