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Question: Nested sum sorting

Question:Nested sum sorting

Pascal4QM 478 Maple 2019
sum
January 18 2020
1

Hi,

From a previous calculation, I got the following nested sum:

Sum(Sum(f[n]*g[q-n]*exp(2*i*Pi*q*x),q = -infinity .. infinity),n = -infinity ..
infinity)

 

However, to keep on the calculus, It is more convenient to have:

Sum(Sum(f[n]*g[q - n]*exp(2*i*Pi*q*x), n = -infinity .. infinity), q = -infinity .. infinity)

 

That is, permute the summation precedence.

Is there a way to automatically transform the first expression into the second one?
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