2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140727We discuss notions of Gauss curvature and mean curvature for polyhedral surfaces. The discretizations are guided by the principle of preserving integral relations for curvatures, like the Gauss/Bonnet theorem and the mean-curvature force balance equation.14 pages, to appear in "Discrete Differential Geometry", Oberwolfach Seminars 38, Birkhauser, 2008Differential GeometryMetric Geometry53A05 (Primary); 52B70, 53C99, 51M25text