2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74569The D-envelope (or galoisian envelope) of rational endomorphisms of P1 are computed. One obtain the following theorem : "the rational transformations of P1 with an invariant meromorphic G-structure are the integrables ones."8 pages, en francaisDynamical Systems37F10, 53C10text