Leonard Euler. Enough said.pic.twitter.com/VlnfMwNHMV
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So this is the analytic continuation of the ζ function.. It is true for the entire complex plane, and as you can see it is zero for all *even* values of s. The analytic continuation is a unique thing, so there's no arbitrariness to it :Dpic.twitter.com/x4cuUKhY80