Browsing by Subject "Quasi coherent sheaf"
Now showing 1 - 1 of 1
Results Per Page
Sort Options
- PublicationOpen AccessPhantom covering ideals in categories without enough projective morphisms(Elsevier, ) Estrada Domínguez, Sergio; Guil Asensio, Pedro Antonio; Odabasi, Sinem; MatemáticasWe give sufficient conditions to ensure that the ideal of -phantom maps in a locally λ-presentable exact category is a (special) (pre)covering ideal, where is an exact substructure of . As a byproduct, we infer the existence of various covering ideals in categories of sheaves which have a meaningful geometrical motivation. In particular, we deal with a Zariski-local notion of phantom maps in categories of sheaves. We would like to point out that our approach is necessarily different from [18], as the categories involved in most of the examples we are interested in, do not have enough projective morphisms.