Commit 2024-05-06 07:35 4aea4b56

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feat(NumberTheory/LSeries): Even Hurwitz zeta functions (II) (#12265) This is a sequel to #12147, adding the key properties of the even Hurwitz zeta function: it is differentiable away from s = 1, and it agrees with the Dirichlet series when the latter converges.

Estimated changes

added theorem LSeriesHasSum_cos
added theorem cosZeta_apply_zero
added theorem cosZeta_neg
added theorem cosZeta_one_sub
added theorem hasSum_int_cosZeta
added theorem hasSum_nat_cosZeta
added theorem hurwitzZetaEven_neg