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Cliques in derangement graphs for innately transitive groups
Journal of Group Theory ( IF 0.5 ) Pub Date : 2024-03-14 , DOI: 10.1515/jgth-2023-0284
Marco Fusari 1 , Andrea Previtali 2 , Pablo Spiga 2
Affiliation  

Given a permutation group 𝐺, the derangement graph of 𝐺 is the Cayley graph with connection set the derangements of 𝐺. The group 𝐺 is said to be innately transitive if 𝐺 has a transitive minimal normal subgroup. Clearly, every primitive group is innately transitive. We show that, besides an infinite family of explicit exceptions, there exists a function f : N N f\colon\mathbb{N}\to\mathbb{N} such that, if 𝐺 is innately transitive of degree 𝑛 and the derangement graph of 𝐺 has no clique of size 𝑘, then n f ( k ) n\leq f(k) . Motivation for this work arises from investigations on Erdős–Ko–Rado type theorems for permutation groups.

中文翻译:

先天传递群的混乱图中的派系

给定一个置换群 𝐺,𝐺 的排列图是具有连接集 𝐺 排列的凯莱图。如果 𝐺 具有传递最小正规子群,则称群 𝐺 是固有传递的。显然,每个本原群都是固有的传递性的。我们证明,除了无限的显式异常族之外,还存在一个函数 F : f\冒号\mathbb{N}\to\mathbb{N} 这样,如果 𝐺 是度 𝑛 的固有及物性且 𝐺 的混乱图没有大小为 𝑘 的团,那么 n F k n\leq f(k) 。这项工作的动机源于对置换群的 Erdős-Ko-Rado 型定理的研究。
更新日期:2024-03-14
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