English

Almost simple groups of Lie type and symmetric designs with $\lambda$ prime

Group Theory 2020-09-14 v2 Combinatorics

Abstract

In this article, we investigate symmetric (v,k,λ)(v,k,\lambda) designs D\mathcal{D} with λ\lambda prime admitting flag-transitive and point-primitive automorphism groups GG. We prove that if GG is an almost simple group with socle a finite simple group of Lie type, then D\mathcal{D} is either the point-hyperplane design of a projective space PGn1(q)\mathrm{PG}_{n-1}(q), or it is of parameters (7,4,2)(7,4,2), (11,5,2)(11,5,2), (11,6,2)(11,6,2) or (45,12,3)(45,12,3).

Keywords

Cite

@article{arxiv.2002.04948,
  title  = {Almost simple groups of Lie type and symmetric designs with $\lambda$ prime},
  author = {Seyed Hassan Alavi and Mohsen Bayat and Ashraf Daneshkhah},
  journal= {arXiv preprint arXiv:2002.04948},
  year   = {2020}
}
R2 v1 2026-06-23T13:39:29.862Z