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arXiv · 2211.11371

On the number of rational points of Artin-Schreier curves and hypersurfaces

Fabio Enrique Brochero Martínez·Daniela Alves de Oliveira
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Abstract

Let $\mathbb F_{q^n}$ denote the finite field with $q^n$ elements. In this paper we determine the number of $\mathbb F_{q^n}$-rational points of the affine Artin-Schreier curve given by $y^q-y = x(x^{q^i}-x)-\lambda$ and of the Artin-Schreier hypersurface $y^q-y=\sum_{j=1}^r a_jx_j(x_j^{q^{i_j}}-x_j)-\lambda.$ Moreover in both cases, we show that the Weil bound is attained only in the case where the trace of $\lambda\in\mathbb F_{q^n}$ over $\mathbb F_q$ is zero. We use quadratic forms and permutation matrices to determine the number of affine rational points of these curves and hypersurfaces.

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Fabio Enrique Brochero Martínez, Daniela Alves de Oliveira. 2022-11-21. On the number of rational points of Artin-Schreier curves and hypersurfaces. https://arxiv.org/abs/2211.11371

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