2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53772We define a new mathematical structure ( graph quantum group) which combines the tower of algebras associated with a graph ${\cal G}$ and the structure of a Hopf algebra {\cal A}. In this structure Ocneanu's string operators become Hopf algebra intertwiners. We present some examples of graph quantum groups.13 pages, latex (use the macro epic.sty available from hepth)High Energy Physics - Theorytext