2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139009We give examples of finitely presented groups containing elements with irrational (in fact, transcendental) stable commutator length, thus answering in the negative a question of M. Gromov. Our examples come from 1-dimensional dynamics, and are related to the generalized Thompson groups studied by M. Stein, I. Liousse and others.8 pages, 1 figureGeometric TopologyDynamical Systems20F12, 37E45 (Primary); 37E10, 57M60, 20F65 (Secondary)text