English

Demi-Normal Surface Singularities

Algebraic Geometry 2016-06-15 v1

Abstract

We prove semi-rationalification and semi-log-canonicalization for Gorenstein demi-normal surfaces. That is, given a Gorenstein demi-normal surface X with semi-rational (respectively, semi-log canonical) singularities in an open set U with complement a finite set of points, there is a proper birational morphism f : Y --> X such that f is an isomorphism over U and Y has only semi-rational (respectively, semi-log canonical) singularities. We proceed by passing to the normalization and then gluing along the conductor in an appropriate rationalification or log-canonicalization of the normalization of X.

Keywords

Cite

@article{arxiv.1606.04169,
  title  = {Demi-Normal Surface Singularities},
  author = {Jeremy Berquist},
  journal= {arXiv preprint arXiv:1606.04169},
  year   = {2016}
}
R2 v1 2026-06-22T14:24:30.670Z