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Hypoelliptic partial differential equations of principal type. Sufficient conditions and necessary conditions. (English) Zbl 0234.35019


MSC:

35H10 Hypoelliptic equations
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References:

[1] Andersson, Arkiv for Mat.
[2] Nirenberg, Comm. Pure Applied Math. 16 pp 331– (1963)
[3] Nirenberg, Comm. Pure Applied Math. 23 pp 1– (1970)
[4] Nirenberg, Comm. Pure Applied Math. 23 pp 459– (1970)
[5] Nirenberg, Comm. Pure Applied Math. 24 pp 279– (1971)
[6] Treves, Amer. J. of Math. pp 174– (1970)
[7] Treves, Comm. Pure Applied Math. 24 pp 71– (1971)
[8] Treves, Comm. Pure Applied Math. 24 pp 537– (1971)
[9] Treves, Comm. Pure Applied Math. 23 pp 637– (1970)
[10] Hamiltonian fields, bicharacteristic strips in relation with existence and regularity of solutions of linear partial differential equations, Proceedings International Congress of Math., Nice, 1970.
[11] Hörmander, Comm. Pure Appl. Math. 23 pp 329– (1970)
[12] Hörmander, Journal of Diff. Eqns.
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