On strengthening of the Kleiman-Chevalley projectivity criterion

Michał Farnik
2013 Proceedings of the American Mathematical Society  
We discuss the possibilities of strengthening the classical Kleiman-Chevalley projectivity criterion by exploring the properties of the Picard number and the maximal quasiprojective open subsets of a variety. We also prove two theorems which give a bound on how much the criterion can be strengthened.
doi:10.1090/s0002-9939-2013-11695-3 fatcat:cdbwgezpnrfvhaklocdndxkw6i