Comment #19 on issue 797 by smi...@gmail.com: Should Lambda accept
Functions as variables?
http://code.google.com/p/sympy/issues/detail?id=797
If a function is detected, Subs can be used to deal with it:
H = Lambda(y, Derivative(Subs(u, u, y), x, x) + x**2 * y)
H(f(x)).doit()
x**2*f(x) + Derivative(f(x), x, x)
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