2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41898The π^0γγvertex is used as an explicit example of the subtleties connected with the application of equation of motion within Chiral Perturbation Theory at the order O(p^6).7 pages, 2 figures; presented at Int. Conf. Renormalization Group 2002, Slovakia, March 2002High Energy Physics - Phenomenologytext