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I'm trying to show that [tex]\sum_{m,n=-\infty}^\infty '(n^2+a^2m^2)^{-s}=\sum_{n=-\infty}^\infty 'n^{-2s}+\sum_{m=-\infty}^\infty'\sum_{n=-\infty}^\infty(n^2+a^2m^2)^{-s}[/tex]. The prime means that we don't include the m=n=0 term.

Has anyone seen this relation? Is it standard?

Thanks!

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# Decomposition of Double Sum

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