Updates:
Status: Valid
Comment #3 on issue 3175 by [email protected]: Sum with reversed limits
gives wrong answer
http://code.google.com/p/sympy/issues/detail?id=3175
These results look correct to me. Cf.
https://en.wikipedia.org/wiki/Empty_sum
However, there are many inconsistencies:
In [9]: Sum(x, (x, 1, 0)).doit()
Out[9]: 1
In [10]: Sum(x, (x, 1, 0)).evalf()
Out[10]: 0.e-122
In [11]: Sum(x, (x, 5, 0)).evalf()
Out[11]: -10.0000000000000
In [12]: Sum(x, (x, 5, 0)).doit()
Out[12]: 15
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