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A maximum principle for a class of hyperbolic equations and applications to equations of mixed elliptic-hyperbolic type. (English) Zbl 0090.07401


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[1] Leçons sur la théorie générale des surfaces, Volume 2, Chapter 2, Section 333, Gauthier-Villars, Paris, 1915.
[2] and , Sur quelques problèmes à l’équation de type mixte de Tricomi, Office Nationale d’Études Recherches Aéronautiques, Publication No. 54, 1952.
[3] Haar, Comptes Rendus des Séances de l’Académie des Sciences 187 pp 23– (1928)
[4] Hopf, Sitzungsberichte der Preussiche Akademie der Wissenschaften 19 pp 147– (1927)
[5] Hopf, Proceedings of the American Mathematical Society 3 pp 791– (1952)
[6] Protter, Journal of Rational Mechanics and Analysis 2 pp 107– (1953)
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