Comment #2 on issue 3618 by [email protected]: Assumptions on
replacement symbols created by cse
http://code.google.com/p/sympy/issues/detail?id=3618
Well, the current model for commutativity doesn't even make sense with the
new assumptions...
expr = A*B*A
with assuming(Q.commutative(A) & Q.commutative(B)):
# too late! expr is either A**2*B or B*A**2 now
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