Abstract
The object of this paper is to show that the Levi-Lax condition is necessary and sufficient for the Cauchy problem to be well-posed.
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Zeman, M. The Levi-Lax condition for partial differential equations with real characteristics of constant multiplicity. Israel J. Math. 31, 57–77 (1978). https://doi.org/10.1007/BF02761380
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DOI: https://doi.org/10.1007/BF02761380