Comment #7 on issue 2855 by [email protected]: Removing sorting of
Add.args and Mul.args
http://code.google.com/p/sympy/issues/detail?id=2855
Here is an example of a correct implementation:
https://github.com/certik/sympyx/blob/master/sympy_py.py
it is *super* simple, just study the code. In particular, look at
Add.freeze_args(), Add.__eq__() and Add.__hash__().
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