Comment #2 on issue 3547 by ronan.l...@gmail.com: Undefined functions with number arguments should have is_number be False
http://code.google.com/p/sympy/issues/detail?id=3547
If we don't know what it is, then we can't evalf() it or compare it to a real real number, which means that is_number should be False. We could easily make the change in AppliedUndef, I think.
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