Comment #6 on issue 2230 by [email protected]: Problem in is_Function ans is_Number
http://code.google.com/p/sympy/issues/detail?id=2230
Well, I think that the way functions are currently designed is wrong and is the source of a lot of problems. Attributes of functions shouldn't be mixed with those of their results and it should be possible to use functions like ordinary sympy objects, cf. issue 1688.
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