2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148442We describe the algebra of a universal formal deformation as the zeroth cohomology of the dg Lie algebra corresponding to this deformation problem. A report at Arbeitstagung 1997 on the joint work with V.Hinich.3 pages, Tex. A slight modification in Tex is madeAlgebraic Geometrytext