Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2934 by smi...@gmail.com: gosper_sum return NaN
http://code.google.com/p/sympy/issues/detail?id=2934
While editing the test suite (sympy/concrete/tests/test_gosper.py ) I found
that the following gosper_sum doesn't return None...it returns nan:
f2d = n*(n + a + b)*a**n*b**n/(factorial(n + a)*factorial(n + b))
ans = 1/(factorial(a - 1)*factorial(b - 1)
... ) - a**(m + 1)*b**(m + 1)/(factorial(a + m)*factorial(b + m))
gosper_sum(f2d, (n, 0, m))
nan
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