Comment #12 on issue 2205 by Vinzent.Steinberg: "Undefined functions"
http://code.google.com/p/sympy/issues/detail?id=2205
Abstract function
This is my favorite.
@Alexey: We need this to represent functions and possibly their
derivatives. Things like "f(x)", "f(0)", "f'(x)".
These objects could be called just "Functions" but the name is already
taken to designate something that isn't a function.
What should it be called instead?
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