ζ(s) = ((2 π)^s (( product_(k=1)^∞ (1 - s/ρ_k) e^(s/ρ_k)) product_(k=-∞)^(-1) (1 - s/ρ_k) e^(s/ρ_k)))/(e^(( gamma /2 + 1) s) (2 (s - 1) Γ(s/2 + 1)))