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”
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چکیده
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1962
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1962-10794-0