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arXiv 2603.23930math.NTmath.AG
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关于具有二次模的 cyclotomic 函数域的注记

A Note on Cyclotomic Function Fields with Quadratic Modulus

Sun Yat-Sen University(中山大学)

Haojie Chen, Chuangqiang Hu

AI总结:

本文研究了具有二次模的 cyclotomic 函数域的特征,证明了其与特定函数域的等价条件,包括群结构、曲率和有理地方数。

摘要:

本文研究了代数几何中代数函数域的特征,重点探讨了具有二次模的 cyclotomic 函数域 $L(Λ_M)$ 的分类问题。受 Arakelian 和 Quoos 对 $L(Λ_M)$ 的分类启发,本文对模为 $M = x^2$ 的 cyclotomic 函数域 $L(Λ_{x^2})$ 提供了完整分类。具体而言,证明了一个定义在 $\mathbb{F}_q$ 上的函数域 $\mathcal{F}$ 与 $L(Λ_{x^2})$ 在 $\mathbb{F}_q$ 上同构当且仅当满足以下三个条件:(i) $\mathcal{F}$ 具有同构于 $(\mathbb{F}_q,+) \times \mathbb{F}_q^*$ 的子群 $G$;(ii) 其亏格为 $g(\mathcal{F}) = 1 + q(q-3)/2$;(iii) $\mathbb{F}_q$ 上的有理地方数恰好为 $q+1$。

英文摘要:

A longstanding and important problem in algebraic geometry is the characterization of algebraic function fields. In this paper, we focus on the characterization problem for cyclotomic function field $L(Λ_M)$, which is an important class of explicit function fields with applications in number theory and coding theory. Motivated by Arakelian and Quoos' classification of $L(Λ_M)$ with an irreducible quadratic modulus, we provide a complete characterization of the cyclotomic function field $L(Λ_M)$ with modulus $M = x^2$. More precisely, we prove that a function field $\mathcal{F}$ over $\mathbb{F}_q$ is $\mathbb{F}_q$-isomorphic to $L(Λ_{x^2})$ if and only if it satisfies the following three conditions: (i) $\mathcal{F}$ has a subgroup $G$ isomorphic to the direct product $(\mathbb{F}_q,+) \times \mathbb{F}_q^*$; (ii) its genus is $g(\mathcal{F}) = 1 + q(q-3)/2$; and (iii) the cardinality of $\mathbb{F}_q$-rational places is exactly $q+1$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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