Comment #4 on issue 4081 by [email protected]: Equivalent doesn't sort args
http://code.google.com/p/sympy/issues/detail?id=4081
OK, looking at the code, it has nothing to do with BooleanFunction.
BooleanFunction is just a Boolean Function, so it does sort its args (as it
should). And and Or are lattice operations, but LatticeOp also sorts the
args (it internally uses _argset in case .args is never used). It's
Equivalent.__new__ directly that does this, when it calls *set(args). It
should use the same methodology as LatticeOp with _argset.
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