2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72151The purpose of this work is to describe a duality between a fragmentation associated to certain Dirichlet distributions and a natural random coagulation. The dual fragmentation and coalescent chains arising in this setting appear in the description of the genealogy of Yule processes.14 pagesProbability60J80, 60J05Dual random fragmentation and coagulation and an application to the genealogy of Yule processestext