2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190759We clarify a discrepancy between two previous calculations of the two-loop QED Euler-Heisenberg Lagrangian, both performed in proper-time regularization, by calculating this quantity in dimensional regularization.12 pages, standard Latex, no figures, uses a4wide.styHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext