English

Hilbert-Burch virtual resolutions for points in $\mathbb{P}^1\times\mathbb{P}^1$

Commutative Algebra 2023-04-12 v1 Algebraic Geometry

Abstract

Building off of work of Harada, Nowroozi, and Van Tuyl which provided particular length two virtual resolutions for finite sets of points in P1×P1\mathbb{P}^1\times\mathbb{P}^1, we prove that the vast majority of virtual resolutions of a pair for minimal elements of the multigraded regularity in this setting are of Hilbert-Burch type. We give explicit descriptions of these short virtual resolutions that depend only on the number of points. Moreover, despite initial evidence, we show that these virtual resolutions are not always short, and we give sufficient conditions for when they are length three.

Cite

@article{arxiv.2304.04953,
  title  = {Hilbert-Burch virtual resolutions for points in $\mathbb{P}^1\times\mathbb{P}^1$},
  author = {Caitlyn Booms-Peot},
  journal= {arXiv preprint arXiv:2304.04953},
  year   = {2023}
}

Comments

21 pages, comments welcome!

R2 v1 2026-06-28T09:58:45.639Z