2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99420In this paper we give new requirements that a tree of $δ$-hyperbolic spaces has to satisfy in order to be $δ$-hyperbolic itself. As an application, we give a simple proof that limit groups are relatively hyperbolic.Group Theory20F65;57M07A Combination Theorem for Relatively Hyperbolic Groupstext