English

Simplicial arrangements with few double points

Combinatorics 2025-10-21 v2 Algebraic Geometry Geometric Topology

Abstract

In their solution to the orchard-planting problem, Green and Tao established a structure theorem which proves that in a line arrangement in the real projective plane with few double points, most lines are tangent to the dual curve of a cubic curve. We provide geometric arguments to prove that in the case of a simplicial arrangement, the aforementioned cubic curve cannot be irreducible. It follows that Gr\"{u}nbaum's conjectural asymptotic classification of simplicial arrangements holds under the additional hypothesis of a linear bound on the number of double points.

Keywords

Cite

@article{arxiv.2409.01892,
  title  = {Simplicial arrangements with few double points},
  author = {Dmitri Panov and Guillaume Tahar},
  journal= {arXiv preprint arXiv:2409.01892},
  year   = {2025}
}

Comments

16 pages, 5 figures, Discrete & Computational Geometry

R2 v1 2026-06-28T18:32:39.161Z