(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Show that ##\sum_{k=2}^\infty d_k## converges to ##\lim_{n\to\infty} s_{nn}##.

2. Relevant equations

I've included some relevant information below:

3. The attempt at a solution

So far I've managed to show that ##\sum_{k=2}^\infty |d_k|## converges, but I don't know how to move on from there.

P.S.

I also posted this question to math.stackexchange but haven't gotten an answer there.

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# Convergence of a double summation using diagonals

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