Comment #19 on issue 2132 by mattpap: Derivative of RootSum
http://code.google.com/p/sympy/issues/detail?id=2132
PolynomialError: non-commutative expressions are not supported
Actually this is true:
In [1]: RootSum(x**2 + 1, Lambda(x, exp(x)))
Out[1]:
⎛ 2 ⎛ x⎞⎞
RootSum⎝x + 1, Λ⎝x, ℯ ⎠⎠
In [2]: _.is_commutative
So, SymPy doesn't know that RootSum is commutative.
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