On Sun, Dec 14, 2008 at 10:20:13PM +0100, Ondrej Certik wrote:
[...]
> Ideally the improvement should be that Functions should behave exactly
> like Symbols (with respect to differentiation and maybe other things),
> but they will also carry the dependencies on other variables -- so
> that sympy can also differentiate with respect to those variables
> correctly.

It sounds nice, but what are the free variables in

  term = x*y**2 + f(u, v)

Is this term a function of

  F1(x,y,f) = term

or

  F2(x,y,u,v) = term

or

  F3(x,y,f,u,v) = term

?

By,

  Friedrich

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