Lifting Weighted Blow-ups
Algebraic Geometry
2017-02-16 v2
Abstract
Let f: X -> Z be a local, projective, divisorial contraction between normal varieties of dimension n with Q-factorial singularities. Let be a f-ample Cartier divisor and assume that f|Y: Y -> W has a structure of a weighted blow-up. We prove that f: X -> Z, as well, has a structure of weighted blow-up. As an application we consider a local projective contraction f: X -> Z from a variety X with terminal Q-factorial singularities, which contracts a prime divisor E to an isolated Q-factorial singularity , such that is f-ample, for a f-ample Cartier divisor L on X. We prove that (Z,P) is a hyperquotient singularity and f is a weighted blow-up.
Keywords
Cite
@article{arxiv.1609.00156,
title = {Lifting Weighted Blow-ups},
author = {Marco Andreatta},
journal= {arXiv preprint arXiv:1609.00156},
year = {2017}
}
Comments
11 pages, minor issues corrected. To appear in Revista Matematica Iberoamericana