On the generalized distributive set of a finite nearfield

Abstract

For any nearfield $(R,+, \circ)$, denote by $D(R)$ the set of all distributive elements of $R$. Let $R$ be a finite Dickson nearfield that arises from Dickson pair $(q,n)$. For a given pair $(\alpha, \beta) \in R^2$ we study the generalized distributive set $ D(\alpha, \beta)$ where $"\circ"$ is the multiplication of the Dickson nearfield. We find that $ D(\alpha, \beta)$ is not in general a subfield of the finite field $\mathbb{F}_{q^n}$. In contrast to the situation for $D(R)$, we also find that $D(\alpha, \beta)$ is not in general a subnearfield of $R$. We obtain sufficient conditions on $\alpha, \beta$ for $ D(\alpha, \beta)$ to be a subfield of $\mathbb{F}_{q^n}$ and derive an algorithm that tests if $D(\alpha, \beta)$ is a subfield of $\mathbb{F}_{q^n}$ or not. We also study the notions of $R$-dimension, $R$-basis, seed sets and seed number of $R$-subgroups of the Beidleman near-vector spaces $R^m$ where $m$ is a positive integer. Finally we determine the maximal $R$-dimension of $gen(v_1,v_2)$ for $v_1,v_2 \in R^m$, where $gen(v_1,v_2)$ is the smallest $R$-subgroup containing the vectors $v_1$ and $v_2$.