Published online by Cambridge University Press: 24 October 2008
The object of this note is to obtain necessary and sufficient conditions for the existence of
on the assumption that ø is integrable in any finite positive interval not including zero (0 < α ≤ x ≤ β < ∞). On reference to the literature on the topic, I find no exhaustive analysis of this problem anywhere.
* See, for example, Hardy, , Messenger of Math. 34 (1905), 11–18;Google ScholarBromwich, , Infinite series, 2nd ed. (1926), 479;Google ScholarPoussin, de la Vallée, Cours d'analyse, 6th ed. (1926), ii, 34.Google Scholar