2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230546Kaluza's mertic with the cylinder condition is considered without the weak gravitational field approximation. It is shown that these hypoteses lead to a non-gauge-invariant electromagnetic theory in a curved space-time. The problem of electro-gravitational unification is considered from this point of view.6 pages, corrected typosGeneral Relativity and Quantum Cosmologytext