2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107366We consider radial solutions to the Cauchy problem for the linear wave equation with a small short-range electromagnetic potential (the "square version" of the massless Dirac equation with a potential) and zero initial data. We prove two a priori estimates that imply, in particular, a dispersive estimate.8 pages, no figuresAnalysis of PDEs35A08, 35L05, 35L15, 58J37, 58J45text