English

Finite groupoids of configurations of lines in $\mathbb{P}^{3}_{\mathbb{C}}$

Algebraic Geometry 2025-11-10 v1 Group Theory

Abstract

In this paper, we investigate groupoids coming from configurations of lines in three-dimensional space. Given a point and two skew lines in PK3\mathbb{P}^{3}_{K} over a field KK, there exists a unique line containing the given point and meeting the two given lines. We use this construction to define a projection function from one line to another by using a skew line as an auxiliary. This way, we may create a groupoid whose objects are lines in a configuration, and whose morphisms are induced by these projection functions. We look at specific configurations for K=CK=\mathbb{C} that yield groupoids with finite automorphism groups.

Keywords

Cite

@article{arxiv.2511.05454,
  title  = {Finite groupoids of configurations of lines in $\mathbb{P}^{3}_{\mathbb{C}}$},
  author = {Jake Kettinger},
  journal= {arXiv preprint arXiv:2511.05454},
  year   = {2025}
}

Comments

24 pages, 1 figure. Feedback is appreciated