Comment #8 on issue 2738 by [email protected]: Make a distinction between operations and their result
http://code.google.com/p/sympy/issues/detail?id=2738
OK, another question, which came up on the mailing list. Should OpAdd(OpAdd(x, y), z) == OpAdd(x, OpAdd(y, x))? Also, what happens if say the inner or outer OpAdd is instead a regular Add?
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