Comment #4 on issue 2476 by [email protected]: nth order Derivative http://code.google.com/p/sympy/issues/detail?id=2476
I like these ideas so far, I only disagreee at this point:
Derivative(x**3, x, a).subs(a, 3) should just return Derivative(x**3, x, a)
This would be inconsistent with f(x).diff(x).subs(x, y) == f(y).diff(y). In my eval_deriv2 branch (the one that solves issue 1620), Derivative(x**3, x, a).subs(a, 3) == Subs(Derivative(x**3, x, a), a, 3).
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