2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44023In this talk I discuss the origin of mass in quantum chromodynamics in the context of the classical and quantum symmetries of the theory.Lecture presented at the SLAC Summer Institute, Aug. 2-13, 2004. 13 pages, 9 figures. Acknoledgements addedHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext