Baouendi, M. S.; Sjöstrand, J. Non hypoellipticite d’opérateurs elliptiques singuliers. (French) Zbl 0355.35018 Sémin. Goulaouic-Schwartz 1975-1976, Équat. dériv. part. Anal. fonct., Exposé No.XXIV, 7 p. (1976). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents MSC: 35H10 Hypoelliptic equations 47F05 General theory of partial differential operators 35J10 Schrödinger operator, Schrödinger equation × Cite Format Result Cite Review PDF Full Text: Numdam EuDML