Was playing around with Fourier series, and found an alternative solution to Euler's Basel problem
∑ 1/n² = π²/6pic.twitter.com/tViTmJIXlL
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And a more obscure one is to compute Σ 1/(n²+α²) from n=1 to ∞ as a function of α (using residue theorem) and then take the limit as α -> 0.
I did the more general case with residues in a previous tweet ;)
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*searches frantically*
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hahah I would retweet it but I don't want to spam people's feed atm
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