Maxima uses the Zeilberger algorithm to attempt to find the closed form. Zeilberger returns something which looks OK but simplify_sum misinterpreters the result.
I have added a stronger check for zeilberger sums in commit [a04d8e]. Maxima now returns the sum unevaluated.
Maxima uses the Zeilberger algorithm to attempt to find the closed form. Zeilberger returns something which looks OK but simplify_sum misinterpreters the result.
I have added a stronger check for zeilberger sums in commit [a04d8e]. Maxima now returns the sum unevaluated.
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Commit: [a04d8e]