2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60801This paper considers normal projective complex surface X with at worst Kawamata log terminal singularities and K_X is numerically trivial. The aim is to prove that there is a finite rational polyhedral cone which is a fundamental domain for the action Aut(X) on the rational convex hull of its ample cone.8 pages, LaTeX Several grammatical mistakes are correctedAlgebraic Geometry14 J50text