English

Point-primitive generalised hexagons and octagons

Combinatorics 2014-10-14 v1 Group Theory

Abstract

In 2008, Schneider and Van Maldeghem proved that if a group acts flag-transitively, point-primitively, and line-primitively on a generalised hexagon or generalised octagon, then it is an almost simple group of Lie type. We show that point-primitivity is sufficient for the same conclusion, regardless of the action on lines or flags. This result narrows the search for generalised hexagons or octagons with point- or line-primitive collineation groups beyond the classical examples, namely the two generalised hexagons and one generalised octagon admitting the Lie type groups G2(q)\mathsf{G}_2(q), 3D4(q)\,^3\mathsf{D}_4(q), and 2F4(q)\,^2\mathsf{F}_4(q), respectively.

Keywords

Cite

@article{arxiv.1410.3423,
  title  = {Point-primitive generalised hexagons and octagons},
  author = {John Bamberg and S. P. Glasby and Tomasz Popiel and Cheryl E. Praeger and Csaba Schneider},
  journal= {arXiv preprint arXiv:1410.3423},
  year   = {2014}
}
R2 v1 2026-06-22T06:21:52.226Z