Formula:DLMF:25.2:E8

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ζ ( s ) = k = 1 N 1 k s + N 1 - s s - 1 - s N x - x x s + 1 d x Riemann-zeta 𝑠 superscript subscript 𝑘 1 𝑁 1 superscript 𝑘 𝑠 superscript 𝑁 1 𝑠 𝑠 1 𝑠 superscript subscript 𝑁 𝑥 𝑥 superscript 𝑥 𝑠 1 𝑥 {\displaystyle{\displaystyle{\displaystyle\zeta\left(s\right)=\sum_{k=1}^{N}% \frac{1}{k^{s}}+\frac{N^{1-s}}{s-1}-s\int_{N}^{\infty}\frac{x-\left\lfloor x% \right\rfloor}{x^{s+1}}\mathrm{d}x}}}

Constraint(s)

s > 0 𝑠 0 {\displaystyle{\displaystyle{\displaystyle\Re{s}>0}}} &
N = 1 , 2 , 3 , 𝑁 1 2 3 {\displaystyle{\displaystyle{\displaystyle N=1,2,3,\dots}}}


Proof

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Symbols List

& : logical and
ζ 𝜁 {\displaystyle{\displaystyle{\displaystyle\zeta}}}  : Riemann zeta function : http://dlmf.nist.gov/25.2#E1
Σ Σ {\displaystyle{\displaystyle{\displaystyle\Sigma}}}  : sum : http://drmf.wmflabs.org/wiki/Definition:sum
{\displaystyle{\displaystyle{\displaystyle\int}}}  : integral : http://dlmf.nist.gov/1.4#iv
a 𝑎 {\displaystyle{\displaystyle{\displaystyle\left\lfloor a\right\rfloor}}}  : floor : http://dlmf.nist.gov/front/introduction#Sx4.p1.t1.r16
d n x superscript d 𝑛 𝑥 {\displaystyle{\displaystyle{\displaystyle\mathrm{d}^{n}x}}}  : differential : http://dlmf.nist.gov/1.4#iv
z 𝑧 {\displaystyle{\displaystyle{\displaystyle\Re{z}}}}  : real part : http://dlmf.nist.gov/1.9#E2

Bibliography

Equation (8), Section 25.2 of DLMF.

URL links

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