English

The translate and line properties for 2-primitive elements in quadratic extensions

Number Theory 2019-10-23 v1

Abstract

Let r,n>1r,n>1 be integers and qq be any prime power qq such that rqn1r\mid q^n-1. We say that the extension Fqn/Fq\mathbb{F}_{q^n}/\mathbb{F}_q possesses the line property for rr-primitive elements if, for every α,θFqn\alpha,\theta\in\mathbb{F}_{q^n}^*, such that Fqn=Fq(θ)\mathbb{F}_{q^n}=\mathbb{F}_q(\theta), there exists some xFqx\in\mathbb{F}_q, such that α(θ+x)\alpha(\theta+x) has multiplicative order (qn1)/r(q^n-1)/r. Likewise, if, in the above definition, α\alpha is restricted to the value 11, we say that Fqn/Fq\mathbb{F}_{q^n}/\mathbb{F}_q possesses the translate property. In this paper we take r=n=2r=n=2 (so that necessarily qq is odd) and prove that Fq2/Fq\mathbb{F}_{q^2} /\mathbb{F}_q possesses the translate property for 2-primitive elements unless q{5,7,11,13,31,41}q \in \{5,7,11,13,31,41\}. With some additional theoretical and computational effort, we show also that Fq2/Fq\mathbb{F}_{q^2} /\mathbb{F}_q possesses the line property for 2-primitive elements unless q{3,5,7,9,11,13,31,41}q \in \{3,5,7,9,11,13,31,41\}.

Keywords

Cite

@article{arxiv.1910.10061,
  title  = {The translate and line properties for 2-primitive elements in quadratic extensions},
  author = {Stephen D. Cohen and Giorgos Kapetanakis},
  journal= {arXiv preprint arXiv:1910.10061},
  year   = {2019}
}

Comments

arXiv admin note: text overlap with arXiv:1906.08046, arXiv:1903.03160

R2 v1 2026-06-23T11:51:31.761Z