DLMF:25.11.E29 (Q7703)

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DLMF:25.11.E29
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    ζ ( s , a ) = 1 2 a - s + a 1 - s s - 1 + 2 0 sin ( s arctan ( x / a ) ) ( a 2 + x 2 ) s / 2 ( e 2 π x - 1 ) d x , Hurwitz-zeta 𝑠 𝑎 1 2 superscript 𝑎 𝑠 superscript 𝑎 1 𝑠 𝑠 1 2 superscript subscript 0 𝑠 𝑥 𝑎 superscript superscript 𝑎 2 superscript 𝑥 2 𝑠 2 superscript 𝑒 2 𝜋 𝑥 1 𝑥 {\displaystyle{\displaystyle\zeta\left(s,a\right)=\frac{1}{2}a^{-s}+\frac{a^{1% -s}}{s-1}+2\int_{0}^{\infty}\frac{\sin\left(s\operatorname{arctan}\left(x/a% \right)\right)}{(a^{2}+x^{2})^{s/2}(e^{2\pi x}-1)}\mathrm{d}x,}}
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    DLMF:25.11.E29
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    a > 0 𝑎 0 {\displaystyle{\displaystyle\Re a>0}}
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    s 1 𝑠 1 {\displaystyle{\displaystyle s\neq 1}}
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