There is a general analytic expression of solutions for generalized Tricomi PDE?

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Filippo Maria Denaro

Does a(x) is such a function that the equation is either elliptic or hyperbolic everywhere or the mathematical character can change locally ?

Gianluca Argentini

Dear Prof. Denaro, in my paper a(x) is a generic (regular, but it should be sufficient only continuity) function, so mathematical character of pde can change locally. In Tricomi original work, a(x) = x. Gianluca