English

On $\mathbb{Z}_N\rtimes\mathbb{Z}_2$-Hopf-Galois structures

Rings and Algebras 2021-08-26 v1 Group Theory Number Theory

Abstract

Let K/FK/F be a finite Galois extension of fields with Gal(K/F)=ΓGal(K/F)=\Gamma. In an earlier work of Timothy Kohl, the author enumerated dihedral Hopf-Galois structures acting on dihedral extensions. Dihedral group is one particular example of semidirect product of Zn\mathbb{Z}_n and Z2\mathbb{Z}_2. In this article we count the number of Hopf-Galois structures with Galois group Γ\Gamma of type GG, where Γ,G\Gamma,G are groups of the form ZNϕZ2\mathbb{Z}_N\rtimes_\phi\mathbb{Z}_2 when NN is odd with radical of NN being a Burnside number. As an application we also find the corresponding number of skew braces.

Keywords

Cite

@article{arxiv.2108.11322,
  title  = {On $\mathbb{Z}_N\rtimes\mathbb{Z}_2$-Hopf-Galois structures},
  author = {Namrata Arvind and Saikat Panja},
  journal= {arXiv preprint arXiv:2108.11322},
  year   = {2021}
}
R2 v1 2026-06-24T05:24:54.410Z