Comment #10 on issue 2802 by smi...@gmail.com: solve error with expression with derivative
http://code.google.com/p/sympy/issues/detail?id=2802

The last one. But what is it that *you* think the problem was. I avoid the problem by not letting the solution process get out of the gates if there is a symbol of interest within a derivative by replacing such derivatives with a unique symbol. That way I don't have to ever worry about it again in the solving process. If I don't do this then, e.g. I'll have to watch out for it when the poly is attempted as it will make a unique generator:

Poly(x+ Derivative(x,x))
Poly(x + Derivative(x, x), x, Derivative(x, x), domain='ZZ')

(And if I make the Poly by giving it 'x' then I will get a generator error.)

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