Comment #8 on issue 1894 by christian.muise: Automatic rewriting of boolean functions
http://code.google.com/p/sympy/issues/detail?id=1894
I'm a little unclear as to why there should be a dual way of dealing with simplification in logic -- if we want to avoid the re-writing to NNF, then why automatically rewrite Implies, Nand, and Nor?
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