2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185534Some simple (namely, single-channel) correlation functions involving an arbitrary number of fields are computed by means of a direct application of the residue calculus, through partial fraction expansions. Examples are presented in minimal models and parafermionic conformal theories. A generic factorized expression is deduced for the corresponding single-channel structure constants.25 pages (harvmac); minor corrections and one ref. addedHigh Energy Physics - Theorytext