Non-uniqueness of the Cauchy problem for linear partial differential equations with variable coefficients. (English) Zbl 0159.38502

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[1] Hörmander, L., Linear Partial Differential Operators. New York: Academic Press Inc. 1963. · Zbl 0108.09301
[2] Trèves, F., Linear Partial Differential Equations with Constant Coefficients. New York: Gordon and Breach 1966. · Zbl 0164.40602
[3] Zachmanoglou, E. C., Uniqueness of the Cauchy problem when the initial surface contains characteristic points. Archive for Rat. Mech. and Anal. 23, 317–326 (1966). · Zbl 0154.35301
[4] Malgrange, B., Sur les ouverts convexes par rapport à un opérateur différentiel. C.R. Acad. Sci. Paris, 254, 614–615 (1962). · Zbl 0117.06301
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