Geodesic
Equations of principal type. Sufficient conditions for local solvability
Sbornik. Mathematics, Tome 44 (1983) no. 4, pp. 517-525

Voir la notice de l'article provenant de la source Math-Net.Ru

A proof of a general theorem on sufficient conditions for local solvability is given. This theorem generalizes known results of Hörmander, Nirenberg, Treves, Beals, Fefferman, and the author. The method of proof gives a simple geometric interpretation of the complicated analytical conditions, and can be used in studying a broad range of problems. Bibliography: 15 titles. 
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     author = {Yu. V. Egorov},
     title = {Equations of principal type. {Sufficient} conditions for local solvability},
     journal = {Sbornik. Mathematics},
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     volume = {44},
     number = {4},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_44_4_a9/}
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Yu. V. Egorov. Equations of principal type. Sufficient conditions for local solvability. Sbornik. Mathematics, Tome 44 (1983) no. 4, pp. 517-525. http://geodesic.mathdoc.fr/item/SM_1983_44_4_a9/