2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127998We characterize precisely the possible rate of decay of the anti-analytic half of a trigonometric series converging to zero almost everywhere.32 pages, published versionClassical Analysis and ODEsComplex Variables42A63, 42A50, 30B30, 42A61Analytic representation of functions and a new quasi-analyticity thresholdtext