Comment #43 on issue 821 by [email protected]: multiple arguments for max and other improvements
http://code.google.com/p/sympy/issues/detail?id=821

I haven't examined the code in detail but I have a few high-level remarks:
* Max and Min shouldn't subclass Function any more.
* They should probably subclass LatticeOp, because they fit the definition. If LatticeOp isn't up to the task, then it's a bug with LatticeOp. * It's odd to make Min a subclass of Max. They should rather inherit from a common base class (called 'RealOrdering', maybe).

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