2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77768We give a finite presentation of the mapping class group of an oriented (possibly bounded) surface of genus greater or equal than 1, considering Dehn twists on a very simple set of curves.22 pages, LaTeX2e. See also http://www.math.sciences.univ-nantes.fr/~gervais/Geometric Topology57M99, 20F05text