2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122308We give a short and "classical" proof of Borcherds' theorem that the moduli space of Enriques surfaces is quasi-affine. The use of the Borcherds' product is replaced in our proof by an application of the Grothendieck-Riemann-Roch theorem.5 pagesAlgebraic Geometrytext