2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109107We present a much simplified proof of Dehn's theorem on the infinitesimal rigidity of convex polytopes. Our approach is based on the ideas of Trushkina and Schramm.to appear in Siberian Journal of Mathematics; 5 pages 2 figuresMetric GeometryCombinatorics52C25, 52B99text