2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/112698On pseudo-Riemannian manifolds of even dimension $n\geq 4$, with everywhere vanishing (Fefferman-Graham) obstruction tensor, we construct a complex of conformally invariant differential operators. The complex controls the infinitesimal deformations of obstruction-flat structures, and, in the case of Riemannian signature the complex is elliptic.5 pagesDifferential GeometryHigh Energy Physics - Theory53A30 (primary); 53A55text