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July 1962 The equation $\left( {\partial ^2 /\partial x^2 + \partial ^2 /\partial y^2 + \left( {x^2 + y^2 } \right)\left( {\partial /\partial t} \right)} \right)^2 u + \partial ^2 u/\partial t^2 = f$, with real coefficients, is “without solutions”
François Treves
Bull. Amer. Math. Soc. 68(4): 332-332 (July 1962).
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Vol.68 • No. 4 • July 1962
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