2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75887Lattices generated by lattice points in skeletons of reflexive polytopes are essential in determining the fundamental group and integral cohomology of Calabi-Yau hypersurfaces. Here we prove that the lattice generated by all lattice points in a reflexive polytope is already generated by lattice points in codimension two faces. This answers a question of J. Morgan.6 pages, 5 figuresCombinatoricsAlgebraic Geometry52B20text