Comment #17 on issue 1735 by asmeurer: Rename .func attribute (.args too?)
http://code.google.com/p/sympy/issues/detail?id=1735
Actually, 'type' is only good if we plan on maintaining this invariant:
In [30]: atan(x).func is atan
Out[30]: True
In [31]: type(atan(x)) is atan
Out[31]: True
i.e., should expr.func (or expr.type) always be the same as type(expr)
(when using is or == comparison)?
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