2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/65362We build a Markov partition of the Feigenbaum dynamical plane, and a system of "external rays", which are invariant under rescaling. Applications to geometry of the Feigenbaum map are given.revised version, accepted by the journal Ergodic Theory and Dynamical SystemsDynamical SystemsComplex Variablestext