2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74426We construct a global counterpart to the notion of affine modification due to Kaliman and Zaidenberg. This leads to a simple explicit description of the structure of birational affine morphisms between arbitrary quasi-projective varieties.in frenchAlgebraic Geometry14E05, 14Rxxtext