Abstract
Lax [27] and Mizohata [34] proved that for the non-characteristic Cauchy problem to be C∞ well-posed it is necessary that the characteristic roots are real. In the mixed problem Kajitani [23] obtained the results corresponding to those in the Cauchy problem under some restrictive assumptions. In §3 we shall relax his assumptions (see, also, [52]). We note that well-posedness of the mixed problems has been investigated by many authors ([1], [2], [19], [20], [22], [26], [32], [33], [38]). We shall consider the mixed problem for hyperbolic systems with constant coefficients in a quarter-space in §§4–6. Hersh [13], [l4], [15] studied the mixed problem for hyperbolic systems with constant coefficients. He gave the necessary and sufficient condition for the mixed problem to be C∞ well-posed. However, his proof seems to be incomplete (see [25]). Sakamoto [37] justified his results for single higher order hyperbolic equations (see, also, [40], [41] [42]). In §4 we shall consider C∞ well-posedness of the mixed problem. Duff [11] studied the location and structures of singularities of the fundamental solutions of the mixed problems for single higher order hyperbolic equations, using the stationary phase method.
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Wakabayashi, S. (1981). The Mixed Problem for Hyperbolic Systems. In: Garnir, H.G. (eds) Singularities in Boundary Value Problems. NATO Advanced Study Institutes Series, vol 65. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8434-9_14
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