$Q$-universal desingularization

Edward Bierstone, Pierre Milman, Michael Temkin
2011 Asian Journal of Mathematics  
We prove that the algorithm for desingularization of algebraic varieties in characteristic zero of the first two authors is functorial with respect to regular morphisms. For this purpose, we show that, in characteristic zero, a regular morphism with connected affine source can be factored into a smooth morphism, a ground-field extension and a generic-fibre embedding. Every variety of characteristic zero admits a regular morphism to a Q-variety. The desingularization algorithm is therefore
more » ... ersal or absolute in the sense that it is induced from its restriction to varieties over Q. As a consequence, for example, the algorithm extends functorially to localizations and Henselizations of varieties. 1991 Mathematics Subject Classification. Primary 14E15, 32S45; Secondary 32S15, 32S20.
doi:10.4310/ajm.2011.v15.n2.a5 fatcat:s5gp6kuowzaqnbj236g2oynxum