2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58306Instead of a linear system of equations for a free electromagnetic field, we propose a nonlinear system of equations. The classical electrodynamics is preseved. The appeared solutions (the electromagnetic fields) having photon properties. The theory posits the vacuum is a physical medium. The most important problems of relativistic interaction of interpenetrating mediums are studied.11 pages, LaTeXMathematical Physicstext