Comment #11 on issue 2472 by asmeurer: Regression in sympy/polys/tests/test_rootoftools.py
http://code.google.com/p/sympy/issues/detail?id=2472
See my DMP__hash__ branch, where I've done that. If this works for everyone, I will clean it up (i.e., add comments explaining why we do that and wrap the code a little), and submit a pull request.
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