2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14772A new formalism is introduced for the transfer of polarized radiation. Stokes parameters are shown to be four-vectors in a Minkowski-like space and, most strikingly, the radiative transfer equation (RTE) turns out to be an infinitesimal transformation under the Poincare (plus dilatations) group. A solution to the transfer equation as a finite element of this group is proposed.Accepted for publication in A&A Main Journal. 12 pages, 1 figureAstrophysicstext