Comment #13 on issue 1612 by renato.c...@gmail.com: Symbol('f')(x) != Function('f')(x)
http://code.google.com/p/sympy/issues/detail?id=1612
I'm not sure about it. Are not the args cached before executing the function? Also, this works:
Function('f', nargs=1)(x) == Symbol('f')(x)
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