Updates:
Cc: Vinzent.Steinberg Ronan.Lamy ellisonbg
Comment #2 on issue 2210 by asmeurer: Sum does not set commutativity
http://code.google.com/p/sympy/issues/detail?id=2210
I was thinking about the same thing. It might make sense to make Expr
objects commutative by default, so that they automatically work with things
like Poly, and we never have any AttributeError("object has no attribute
is_commutative") bugs. I definitely want to know other's opinions on this,
though.
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