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Precise finite speed with bare hands. (English) Zbl 1123.35334
Summary: A precise finite speed result is proved for general hyperbolic systems using neither Hamilton-Jacobi theory as in [J.-L. Joly, G. MĂ©tivier and J. Rauch J. Hyperbolic Differ. Equ. 2, No. 3, 713–744 (2005; Zbl 1090.35114)] nor the theorem of A. Marchaud [Composito Math. 3, 89–127 (1936; Zbl 0013.26303 and JFM 62.0803.02)].

MSC:
35L45 Initial value problems for first-order hyperbolic systems
35A21 Singularity in context of PDEs
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