2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45083We demonstrate that the analytic solution for the set of energy eigenvalues of the semi-relativistic Coulomb problem reported by B. and L. Durand is in clear conflict with an upper bound on the ground-state energy level derived by some straightforward variational procedure.5 pagesHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext