2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93952In this paper the fixed-energy amplitude (Green's function) of the relativistic Coulomb system is solved by Duru-Kleinert (DK) method. In the course of the calculations we observe an equivalence between the relativistic Coulomb system and a radial oscillator.10 pages, ReVTeX, no figuresQuantum Physicstext