On 1/13/12, Reinhard Oldenburg <oldenbur at math.uni-frankfurt.de> wrote:
> The following rather simple sum is not reported properly by nusum:
> nusum(k*(5/6)^(k-1),k,1,inf)
Well, if I remember correctly, nusum expects the upper limit to be
a variable e.g. n instead of inf.
Try simplify_sum, which applies nusum and several other algorithms.
load (simplify_sum);
simplify_sum (sum (k*(5/6)^(k - 1), k, 1, inf));
=> 36
Hope this helps
Robert Dodier