2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206494We consider dihadron fragmentation functions, describing the fragmentation of a parton in two unpolarized hadrons, and in particular extended dihadron fragmentation functions, explicitly dependent on the invariant mass, $M_h$, of the hadron pair. We first rederive the known results on $M_h$-integrated functions using Jet Calculus techniques, and then we present the evolution equations for extended dihadron fragmentation functions. Our results are relevant for the analysis of experimental measurements of two-particle-inclusive processes at different energies.9 pages, 1 figure in eps format; RevTeX4 styleHigh Energy Physics - Phenomenologytext