Big $q$-ample Line Bundles
Algebraic Geometry
2019-02-20 v1
Abstract
A recent paper of Totaro develops a theory of -ample bundles in characteristic 0. Specifically, a line bundle on is -ample if for every coherent sheaf on , there exists an integer such that implies for . We show that a line bundle on a complex projective scheme is -ample if and only if the restriction of to its augmented base locus is -ample. In particular, when is a variety and is big but fails to be -ample, then there exists a codimension 1 subscheme of such that the restriction of to is not -ample.
Cite
@article{arxiv.1105.3449,
title = {Big $q$-ample Line Bundles},
author = {Morgan V Brown},
journal= {arXiv preprint arXiv:1105.3449},
year = {2019}
}
Comments
9 pages, 2 pdf figures