Published online by Cambridge University Press: 26 February 2010
If f(s) is the analytic function defined by the Dirichlet series and if
where 0 ≤ b < 1, then the series converges for Re s > 1 and f(s) is regular in the half plane Re s > b except for a simple pole with residue C ≠ 0 at a s = 1. Thus f(s) has a Laurent expansion at s = 1 and it has been shown [1] that under these conditions
where