2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77833Let $M = H^3/Γ$ be a hyperbolic 3-manifold, where $Γ$ is a non-elementary Kleinian group. It is shown that the length spectrum of $M$ is of unbounded multiplicity.20 pages, no figures. Proof of Lemma 6.3 has been simplified and generalized. More details added to proof of Lemma 2.1. To appear in Israel Journal of MathematicsGeometric Topology57M50(primary); 22E40(secondary)text