2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149922We treat nine of fourteen triangle singularities in Arnold's classification list of singularities. We consider what kind of combinations of rational double points can appear on their small deformation fibers. We show their combinations are described by a simple priciple using Dynkin graphs.7 pages, AMS-TeXAlgebraic Geometrytext