Riemann zeta as integral of monomial divided by an exponential
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Theorem
The following formula holds for $\rm{Re}(z)>1$: $$\zeta(z) = \dfrac{1}{\Gamma(z)} \displaystyle\int_0^{\infty} \dfrac{t^{z-1}}{e^t-1} \rm{d}t,$$ where $\zeta$ denotes the Riemann zeta function and $e^t$ denotes the exponential.
Proof
Videos
Zeta Integral by ei pi (5 July 2016)
References
- 1930: Edward Charles Titchmarsh: The Zeta-Function of Riemann ... (previous) ... (next): § Introduction $(3)$