English

Hopf-Galois Realizability of $\mathbb{Z}_n\rtimes\mathbb{Z}_2$

Group Theory 2022-01-27 v1

Abstract

Let GG and NN be finite groups of order 2n2n where nn is odd. We say the pair (G,N)(G,N) is Hopf-Galois realizable if GG is a regular subgroup of \h(N)=N\au(N)\h(N)=N\rtimes\au(N). In this article we give necessary conditions on GG (similarly NN) when NN (similarly GG) is a group of the form ZnZ2\mathbb{Z}_n\rtimes\mathbb{Z}_2. Further we show that this condition is also sufficient if radical of nn is a Burnside number. This classifies all the skew braces which has the additive group (or the multiplicative group) to be isomorphic to ZnZ2\mathbb{Z}_n\rtimes\mathbb{Z}_2, in this case.

Keywords

Cite

@article{arxiv.2201.10862,
  title  = {Hopf-Galois Realizability of $\mathbb{Z}_n\rtimes\mathbb{Z}_2$},
  author = {Namrata Arvind and Saikat Panja},
  journal= {arXiv preprint arXiv:2201.10862},
  year   = {2022}
}