Updates:
Summary: collect is not nc-aware (was: wrong answer from simplifying
non-commutative symbols)
Comment #11 on issue 642 by [email protected]: collect is not nc-aware (was:
wrong answer from simplifying non-commutative symbols)
http://code.google.com/p/sympy/issues/detail?id=642
factor is now nc-aware; collect has not been fixed:
>>> e=(A*B-B*A)
>>> factor(e)
A*B - B*A
>>> simplify(e)
A*B - B*A
>>> radsimp(e)
A*B - B*A
>>> collect(e, A)
0
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