Updates:
Status: Fixed
Comment #1 on issue 1564 by [email protected]: Cannot sum expression with
factorial
http://code.google.com/p/sympy/issues/detail?id=1564
This was fixed in 0f187e5:
In [1]: summation(x*factorial(x),(x,1,n))
Out[1]: -1 + n⋅n! + n!
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