2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170154It is pointed out that the previous energy-momentum tensors of Minkowski and Abraham for the electromagnetic field in continuous media are based on a covariant formulation which does not reflect a symmetry inherent to the system. Instead, taking into account the intrinsic invariance under Lorentz transformations involving the reduced speed of light in such a medium, a compact and fully consistent theory can be formulated without the old problems.12 pages, LaTeX; minor text improvementsHigh Energy Physics - PhenomenologyHistory and Philosophy of Physicstext