2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99807Paper is withdrawn due to errors (superseded by math.AG/0604303). Formula 6.5 is false. Section 6 is false, and the main statement is true only for bundles $B$ with $c_1(B)$ SU(2)-invariant.paper withdrawn (superseded by math.AG/0604303)Algebraic GeometryDifferential Geometrytext