2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58546Given an invertible sheaf, does it come from a Cartier divisor? This might fail in presence of embedded components. I give some examples and characterize those invertible sheaves that allow a Cartier divisor.5 pages, to appear in Arch. MathAlgebraic Geometry14C20text