Updates:
Summary: Symbol('f')(x) != Function('f')(x)
Comment #1 on issue 1612 by asmeurer: Symbol('f')(x) != Function('f')(x)
http://code.google.com/p/sympy/issues/detail?id=1612
Comment 1 on issue 440 helped me figure this one out:
In [1]: S("f(x)") == Symbol('f')(x)
Out[1]: True
In [2]: Symbol('f')(x) == Function('f')(x)
Out[2]: False
The shortcut is fine, but they should evaluate the same.
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