License: Licence agreement concerning inclusion of doctoral thesis in the Institutional Repository of the University of LeidenDecember 8th, 2016
FiledDecember 8th, 2016and testing that V U (U X U′) (which is given as an open subscheme of the scheme Y X X = Y) is the same as V. Moreover, we see that if the image of f is contained in U′, then the diagram above gives a way to compute a presentation of the induced morphism V → U′.