sympy/sympy — pull request #2346 by Manoj-Kumar-S (2013-08-02 08:34:17+00:00)
Title: Solving variable coefficient PDE's

SymPy can now solve Partial Differential Equations of the form
`a(x, y)*u(x, y).diff(x) + b(x, y)*u(x, y).diff(y) + c(x, y) - G(x, y)`

where a, b, c and G are arbitrary functions in `x` and `y`