2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145786In this paper we present a new method to study Fourier coefficients of holomorphic and non-holomorphic Eisenstein series simultaneously.To appear in the conference volume "Modular forms" Schiermonnikoog 2006, by B. Edixhoven, G.van der Geer, and B. MoonenNumber Theorytext