Comment #6 on issue 1928 by asmeurer: Boolean algebra inconsistencies http://code.google.com/p/sympy/issues/detail?id=1928
Is Equivalent supposed to be the same as if and only if (logical equivalence)? I don't see how this can be defined for 1 or 0 arguments. Is it convenient somehow to have Equivalent(x) and Equivalent() return True instead of
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