Abstract
We study qualitative features of the initial value problemz t + F(z) x = 0, z(x, 0) = z 0 (x), x ∈ R, where z(x,t) ∈ R 2, with Riemann inital data, viz. z 0 (x) = z l if x < 0 and z 0 (x) = z r if x > 0. In particular we are interested in the case when the system changes type when the eigenvalues of the Jacobian dF become complex. It is proved that if z l and z r are in the elliptic region, and the elliptic region is convex, then part of the solution has to be outside the elliptic region. If both z l and z r are in the hyperbolic region, then the solution will not enter the elliptic region. We show with an explicit example that the latter property is not true for general Cauchy data. This example is investigated numerically.
Supported in part by Vista, NAVF and NSF grant DMS-8801918. H.H. would like to thank Barbara Keyfitz, Michael Shearer and the Institute for Mathematics and its Applications for organizing a very stimulating workshop and for the invitation to present these results.
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Holden, H., Holden, L., Risebro, N.H. (1990). Some Qualitative Properties of 2 × 2 Systems of Conservation Laws of Mixed Type. In: Keyfitz, B.L., Shearer, M. (eds) Nonlinear Evolution Equations That Change Type. The IMA Volumes in Mathematics and Its Applications, vol 27. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9049-7_5
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