Rational points and inflexions on Hermitian-relative curves
Abstract
In [6], we introduced the notion of a Hermitian-relative curve, which is a plane curve defined by (x√q, y√q, z√q)A (x,y,z)t =0 with A ∈ GL(3, 𝔽q). After investigating their basic properties, we classified those curves with two or more rational inflexions. In this paper, we first complete the classification of curves whose rational points are all inflexions by demonstrating the existence of curves with exactly one rational point. As a continuation, we then classify Hermitian-relative curves that possess at least one rational point which is not an inflexion. We categorize these curves according to the ordered pair consisting of the number of rational points and the number of inflexions. Finally, we enumerate all possible pairs and prove that each pair is realized by a suitable curve.
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BibTeX
@misc{homma2026rational,
title = {{Rational points and inflexions on Hermitian-relative curves}},
author = {Masaaki Homma and Seon Jeong Kim},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.09672},
eprint = {2610.09672},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.09672},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Rational points and inflexions on Hermitian-relative curves
AU - Masaaki Homma
AU - Seon Jeong Kim
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.09672
UR - https://arxiv.org/abs/2610.09672
AB - In [6], we introduced the notion of a Hermitian-relative curve, which is a plane curve defined by (x^√q, y^√q, z^√q)A (x,y,z)^t =0 with A ∈ GL(3, 𝔽_q). After investigating their basic properties, we classified those curves with two or more rational inflexions. In this paper, we first complete the classification of curves whose rational points are all inflexions by demonstrating the existence of curves with exactly one rational point. As a continuation, we then classify Hermitian-relative curves that possess at least one rational point which is not an inflexion. We categorize these curves according to the ordered pair consisting of the number of rational points and the number of inflexions. Finally, we enumerate all possible pairs and prove that each pair is realized by a suitable curve.
ER -