Comment #3 on issue 2210 by [email protected]: Sum does not set commutativity
http://code.google.com/p/sympy/issues/detail?id=2210
There is more to this, e.g: In [53]: print O(x).is_commutative None -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
