Comment #13 on issue 1894 by christian.muise: Automatic rewriting of boolean functions
http://code.google.com/p/sympy/issues/detail?id=1894
I'd recommend considering individual to_nnf functions on each of the classes -- the logic gets muddy looking when put into one large to_nnf function that handles all of the cases.
So for example, everything inheriting from BooleanFunction must implement the to_nnf function, and they only handle their own special case (the Implies does the (!a | b), etc).
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