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Normalizer Quotients of Symmetric Groups and Inner Holomorphs https://arxiv.org/abs/2408.07133 #mathGR

Normalizer Quotients of Symmetric Groups and Inner Holomorphs

We show that every finite group $T$ is isomorphic to a normalizer quotient $N_{S_n}(H)/H$ for some $n$ and a subgroup $H\leq S_n$. We show that this holds for all large enough $n\ge n_0(T)$ and also with $S_n$ replaced by $A_n$. The two main ingredients in the proof are a recent construction due to Cornulier and Sambale of a finite group $G$ with $\mathrm{Out}(G)\cong T$ (for any given finite group $T$) and the determination of the normalizer in $\mathrm{Sym(G)}$ of the inner holomorph $\mathrm{InHol}(G)\leq\mathrm{Sym}(G)$ for any centerless indecomposable finite group $G$, which may be of independent interest.

arxiv.org
August 16, 2024 at 3:10 AM · · feed2toot · 0 · 0 · 0
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