2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54797We explain the concept of worldline Green functions on classes of multiloop graphs. The QED beta function and the 2-loop Euler-Heisenberg Lagrangian are discussed for illustration.6 pages, standard Latex, no figures, talk given by M.G. Schmidt at the International Seminar and Conference on Path Integrals, Dubna, Russia, 27 - 31 May 1996High Energy Physics - Theorytext