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On E. E. Levi’s functions for hyperbolic equations with triple characteristics. (English) Zbl 0238.35050


MSC:

35L30 Initial value problems for higher-order hyperbolic equations
35L35 Initial-boundary value problems for higher-order hyperbolic equations
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[10] and , Sur la condition de E. E. Levi concernant des équations hyperboliques, Publ. R.I.M.S., Kyoto Univ. Ser. A-Vol. 4, 1968, pp. 511–526.
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