2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40108After an introduction to chiral perturbation theory, the effective field theory of the standard model at low energies, a brief overview is given of applications to light-flavour physics. Three topics in the strong interactions of pseudoscalar mesons are then discussed in some detail: loops and chiral logs, pion-pion scattering and isospin violation.Lectures given at the Advanced School on QCD 2000, Benasque, Spain, July 2000, to appear in the Proceedings; 25 pages, 3 figuresHigh Energy Physics - Phenomenologytext