Comment #1 on issue 3547 by [email protected]: Undefined functions with number arguments should have is_number be False
http://code.google.com/p/sympy/issues/detail?id=3547
But our assumptions on Function mean it is a number, even if we don't know what that number is.
Regarding solve, I don't see how it's related, nor why we should arbitrarily disallow that.
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