(original) (raw)
\[\zeta\left(s,a\right)=-s\int_{-a}^{\infty}\frac{x-\left\lfloor x\right\rfloor-% \frac{1}{2}}{(x+a)^{s+1}}\,\mathrm{d}x,\]
\[\zeta\left(s,a\right)=-s\int_{-a}^{\infty}\frac{x-\left\lfloor x\right\rfloor-% \frac{1}{2}}{(x+a)^{s+1}}\,\mathrm{d}x,\]