2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40876Evidence is reviewed suggesting that QCD remains a perturbative theory with a (relatively) small coupling constant down to a distinct infrared boundary on perturbative physics, a boundary corresponding to the momentum scale associated with a beta-function pole.Talk presented at The Ochanomizu University Workshop, June 14,2001 (8 pages)High Energy Physics - Phenomenologytext