Mathematics – Algebraic Geometry
Scientific paper
2007-10-12
Bull. Soc. Math. France 138 (2), 2010, p. 181-230
Mathematics
Algebraic Geometry
42 pages; added sections on descent of locally closed subsets and weakly normal descent; many other changes; final version
Scientific paper
Using the flatification by blow-up result of Raynaud and Gruson, we obtain new results for submersive and subtrusive morphisms. We show that universally subtrusive morphisms, and in particular universally open morphisms, are morphisms of effective descent for the fibered category of etale morphisms. Our results extend and supplement previous treatments on submersive morphisms by Grothendieck, Picavet and Voevodsky. Applications include the universality of geometric quotients and the elimination of noetherian hypotheses in many instances.
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