Comment #17 on issue 797 by [email protected]: bug in Lambda
http://code.google.com/p/sympy/issues/detail?id=797
Well if we do not use functions with Lambda (which we cannot), then this
bug seems invalid:
In [33]: H = Lambda(y, Derivative(y, x, x) + x**2 *y)
In [34]: H
Out[34]: Lambda(y, x**2*y + Derivative(y, x, x))
In [35]: H(x)
Out[35]: x**3 + Derivative(x, x, x)
In [36]: _.doit()
Out[36]: x**3
In [37]: H(x**3)
Out[37]: x**5 + Derivative(x**3, x, x)
In [38]: _.doit()
Out[38]: x**5 + 6*x
So, I think we should mark this as a Needs-Review? Well at least until such
a time when we can use functions with Lambda, this isn't a bug, IMHO.
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