Iterated semidirect-product conjecture for braid-orbit permutation groups

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Let G>IG>I be a finite group with Z(G)=IZ(G)=I. Let (C1,C2,C3,C4)(C_1,C_2,C_3,C_4) be a class vector of length 44 of GG, let Z⊆Σ4i(C1,C2,C3,C4)Z\subseteq\Sigma^i_4(C_1,C_2,C_3,C_4) be a B4B_4-orbit with q=∣Z∣>0q=\lvert Z\rvert>0, and let ρ4:B4→Sq\rho_4:B_4\to S_q be the induced permutation representation of the action of B4B_4 on ZZ.

Iterated semidirect-product conjecture.

ρ4(B4)≅Cnlkl⋊(⋯⋊(Cn2k2⋊(Cn1k1⋊Gm))⋯ )≤Sq,\rho_4(B_4)\cong C_{n_l}^{k_l}\rtimes(\cdots\rtimes(C_{n_2}^{k_2}\rtimes(C_{n_1}^{k_1}\rtimes G_m))\cdots)\leq S_q,

with Gm∈{Am,Sm}G_m\in\{A_m,S_m\}, q∣m⋅n1⋅⋯⋅nlq\mid m\cdot n_1\cdot\dots\cdot n_l, m≤qm\leq q, l∈N0l\in\mathbb{N}_0, n1,…,nl∈{2,3}n_1,\dots,n_l\in\{2,3\}, k1,…,kl∈Nk_1,\dots,k_l\in\mathbb{N}, and k1=m−1k_1=m-1.

The conjecture proposes a restricted structure for the permutation groups arising from braid-group actions on these finite orbits. The supplied text motivates it through computations of examples, but provides no resolution.

References

Primary source

Frank Häfner, “Braid orbits and the Mathieu group M_23 as Galois group”, arXiv:2202.08222 (2022).

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