2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40812We review recent developments in the calculation of deep-inelastic structure functions to next-to-next-to leading order in perturbative QCD. We discuss the impact of these corrections on the determination of the strong coupling alpha_s and the parton distributions.7 pages, LaTeX, uses axodraw.styHigh Energy Physics - Phenomenologytext