论文标题

几乎简单的谎言类型和对称设计,$λ$ prime

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

论文作者

Alavi, Seyed Hassan, Bayat, Mohsen, Daneshkhah, Ashraf

论文摘要

在本文中,我们调查了对称$(v,k,λ)$ designs $ \ mathcal {d} $,其中$λ$ prime允许flag trag-prime允许旗帜变常和点型自动形态学组$ g $。我们证明,如果$ g $是一个几乎简单的群体,那么socle是有限的简单谎言类型组,那么$ \ mathcal {d} $是射影空间$ \ mathrm {pg} _ {n-1} _ {n-1} _ {n-1}(q)$的点杂制设计的设计,或者是参数$(7,4,4,4,4,4,4,2)$(11,4,4,2)$(11,2,2) $(45,12,3)$。

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

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