Definition 13.1.1 generalizes to linear PDEs with coefficients that are functions of x
Chapter 13, Problem 30(choose chapter or problem)
Definition 13.1.1 generalizes to linear PDEs with coefficients that are functions of x and y. Determine the regions in the xy-plane for which the equation a2u a2u a2u (xy + 1)-2 + (x + 2y)--+ -2 + xy2u = 0 ax axay ay is hyperbolic, parabolic, or elliptic.
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