2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103566It is an original method based on systems of prameters represented by reals which obey to an infinite descent (convergent sequences). We define calculus of quotients and they conduct quickly to a consequent result. Our own scepticism made us doubt and we did errors, but the proof is correct !11 pagesGeneral Mathematicstext