Comment #2 on issue 2684 by [email protected]: Deepcopy does not work on evaluate False
http://code.google.com/p/sympy/issues/detail?id=2684
No, that wouldn't work, because when __setstate__ is called, the Mul has already been turned into a Float. I think that we have to implement __reduce_ex__ (cf. http://docs.python.org/library/pickle.html#pickling-and-unpickling-extension-types ).
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