Comment #35 on issue 274 by [email protected]: evaluate keyword from old core
http://code.google.com/p/sympy/issues/detail?id=274
Another issue I just noticed with evaluate=False. It will make solving issue 2855 (and as a consequence issue 1973) very difficult if not impossible to fix. The reason is that without evaluate=False, Add.__eq__ and Mul.__eq__ could just be a comparison of frozenset(self.args), eliminating the need for sorting. But with evaluate=False, you can have duplicate elements in the .args, so this method would not work. I suppose we could special case it (if len(self.args) != len(frozenset(self.args)): ...), but that would still require sorting at some level.
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