Comment #9 on issue 642 by [email protected]: wrong answer from simplifying
non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=642
Note that coeff has been written to be nc-aware;
(A*B-A*B*A).coeff(A,right=1)
B - B*A
(A*B-A*B*A).coeff(A,right=0)
A*B
So for any non-commutative collecting, perhaps collect could use coeff to
do the collecting.
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