English

Infinite Intersections of open subschemes and the Hilbert scheme of points

Algebraic Geometry 2007-05-23 v1

Abstract

We study infinite intersections of open subschemes and the corresponding intersection of Hilbert schemes. If {Ui}\{U_i\} is the collection of open subschemes of a variety XX containing a fixed point PP, then we show that the Hilbert functor of flat and finite families on the spectrum of the local ring of PP is given by the intersection of \CalHi{\Cal H}_i, where \CalHi{\Cal H}_i is the Hilbert functor of flat and finite families on UiU_i. In particular we show that the Hilbert functor of flat and finite families on the spectrum of the local ring of PP is representable by a scheme.

Keywords

Cite

@article{arxiv.math/0205239,
  title  = {Infinite Intersections of open subschemes and the Hilbert scheme of points},
  author = {R. M. Skjelnes and C. Walter},
  journal= {arXiv preprint arXiv:math/0205239},
  year   = {2007}
}