Comment #6 on issue 1198 by asmeurer: pickle does not work for Function http://code.google.com/p/sympy/issues/detail?id=1198
Actually, pickle has its own function called whichmodule which tries to find the module if __module__ is set to None. So if we wanted to use the above hack, it would be better to just set __module__ to None before creating the UndefinedFunction.
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