The existence of primitive normal elements of quadratic forms over finite fields

preprint2020arXivOpen access

Abstract

For q=3rq=3^r (r>0r>0), denote by Fq\mathbb{F}_q the finite field of order qq and for a positive integer m≥2m\geq2, let Fqm\mathbb{F}_{q^m} be its extension field of degree mm. We establish a sufficient condition for existence of a primitive normal element αα such that f(α)f(α) is a primitive element, where f(x)=ax2+bx+cf(x)= ax^2+bx+c, with a,b,c∈Fqma,b,c\in \mathbb{F}_{q^m} satisfying b2≠acb^2\neq ac in $\Fm$ except for at most 9 exceptional pairs (q,m)(q,m).

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