2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117954If G is a finite graph and n is a natural number, then the n-strand braid group of G is the fundamental group of the configuration space of n points on G. This article gives a complete computation of the integral cohomology rings of the n-strand braid groups in case G is a tree. Some of the argument builds on earlier joint work with Lucas Sabalka.25 pages, 14 figuresAlgebraic TopologyGroup Theory57M07; 20J06text