English

The generators of $5$-class group of some fields of degree 20 over $\mathbb{Q}$

Number Theory 2022-08-18 v2

Abstract

Let Γ=Q(n5)\Gamma \,=\, \mathbb{Q}(\sqrt[5]{n}) be a pure quintic field, where nn is a positive integer, 5th5^{th} power-free. Let k0=Q(ζ5)k_0\,=\,\mathbb{Q}(\zeta_5) be the cyclotomic field containing a primitive 5th5^{th} root of unity ζ5\zeta_5, and k=Γ(ζ5)k\,=\,\Gamma(\zeta_5) be the normal closure of Γ\Gamma. Let Ck,5C_{k,5} be the 55-component of the class group of k. The purpose of this paper is to determine generators of Ck,5C_{k,5}, whenever it is of type (5,5)(5,5) and the rank of the group of ambiguous classes under the action of Gal(k/k0)=σGal(k/k_0)\, =\,\langle \sigma\rangle is 11.

Keywords

Cite

@article{arxiv.2005.04314,
  title  = {The generators of $5$-class group of some fields of degree 20 over $\mathbb{Q}$},
  author = {Fouad Elmouhib and Mohamed Talbi and Abdelmalek Azizi},
  journal= {arXiv preprint arXiv:2005.04314},
  year   = {2022}
}

Comments

19 pages, 3 tables