Comment #6 on issue 3073 by asmeu...@gmail.com: Ordering args in Adds when printing to move negative signs
http://code.google.com/p/sympy/issues/detail?id=3073
Maple just keeps things in the order you enter them, and output from functions is customized (e.g., the series function returns expressions in rev-lex order, and I think most other things use something similar to what we do with lex).
The TI89 does something along the lines of what is suggested here. We could probably figure out what it's algorithm is.
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