2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138319This lecture provides an introduction to the renormalisation group as applied to scattering of two nonrelativistic particles. As well as forming a framework for constructing effective theories of few-nucleon systems, these ideas also provide a simple example which illustrates general features of the renormalisation group.9 pages, 4 eps figures; contribution to the Bled 2007 Workshop "Hadron structure and lattice QCD"High Energy Physics - PhenomenologyNuclear TheoryQuantum Physicstext