2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71876We use the theory of twisted resolutions and twisted complexes to give a proof of Kontsevich's claim that Yoneda product corresponds to cup product in a canonical isomorphism from the Ext groups of the product space with coefficients in the diagonal sheaf to the cohomology with coefficients in exterior powers of the tangent sheaf.amslatex, uses amsmath,amsfonts,amsthm,amscd,eucalAlgebraic Geometry18G10, 16E40text