Comment #4 on issue 2205 by [email protected]: "Undefined functions" http://code.google.com/p/sympy/issues/detail?id=2205
Instead of making a new class can we just make an expr method is_UserFunction that returns `self.is_Function and self.nargs is None` or `hasattr(self, 'undefined_Function')`? Or is there a some other reasoning driving the change?
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