2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59711One describes those double structures on rational normal curves which are defined scheme theoretically by quadratic equations and have linear syzygies, generalizing this way the double line in the planelatex, 16 pagesAlgebraic GeometryCommutative Algebra14H45, 13D02, 20G05text