In Response To 'Re: Slowdown of computation of multiple sums'
Let me rephrase my question. Lets say I want to make sum
where function[n] is defined as
where differentfunction[n,i,j,k] can be quite complicated function which could even contain i-th derivatives of some genereting function etc.
Now, when the sum over n is calculated, will it have to run internally in every term for every n all the summations over i,j,k which are in the definition of function[n]? Or will those sums be done at the beginning and then Mathematica will just insert values of n from nmin to nmax?