Formula:DLMF:25.13:E2

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\PeriodicZeta @ x s = Γ ( 1 - s ) ( 2 π ) 1 - s ( e π i ( 1 - s ) / 2 \HurwitzZeta @ 1 - s x + e π i ( s - 1 ) / 2 \HurwitzZeta @ 1 - s 1 - x ) \PeriodicZeta @ 𝑥 𝑠 Euler-Gamma 1 𝑠 superscript 2 1 𝑠 imaginary-unit 1 𝑠 2 \HurwitzZeta @ 1 𝑠 𝑥 imaginary-unit 𝑠 1 2 \HurwitzZeta @ 1 𝑠 1 𝑥 {\displaystyle{\displaystyle{\displaystyle\PeriodicZeta@{x}{s}=\frac{\Gamma% \left(1-s\right)}{(2\pi)^{1-s}}\*\left({\mathrm{e}^{\pi\mathrm{i}(1-s)/2}}% \HurwitzZeta@{1-s}{x}+{\mathrm{e}^{\pi\mathrm{i}(s-1)/2}}\HurwitzZeta@{1-s}{1-% x}\right)}}}

Constraint(s)

0 < x < 1 0 𝑥 1 {\displaystyle{\displaystyle{\displaystyle 0<x<1}}} &
s > 1 𝑠 1 {\displaystyle{\displaystyle{\displaystyle\Re{s}>1}}}


Proof

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Symbols List

& : logical and
F 𝐹 {\displaystyle{\displaystyle{\displaystyle F}}}  : periodic zeta function : http://dlmf.nist.gov/25.13#E1
Γ Γ {\displaystyle{\displaystyle{\displaystyle\Gamma}}}  : Euler's gamma function : http://dlmf.nist.gov/5.2#E1
π 𝜋 {\displaystyle{\displaystyle{\displaystyle\pi}}}  : ratio of a circle's circumference to its diameter : http://dlmf.nist.gov/5.19.E4
e e {\displaystyle{\displaystyle{\displaystyle\mathrm{e}}}}  : the base of the natural logarithm : http://dlmf.nist.gov/4.2.E11
i i {\displaystyle{\displaystyle{\displaystyle\mathrm{i}}}}  : imaginary unit : http://dlmf.nist.gov/1.9.i
ζ 𝜁 {\displaystyle{\displaystyle{\displaystyle\zeta}}}  : Hurwitz zeta function : http://dlmf.nist.gov/25.11#E1
z 𝑧 {\displaystyle{\displaystyle{\displaystyle\Re{z}}}}  : real part : http://dlmf.nist.gov/1.9#E2

Bibliography

Equation (2), Section 25.13 of DLMF.

URL links

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