arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.03323math.LO
收藏

代数闭值域的驯服展开式中的可定义函数

Definable functions in tame expansions of algebraically closed valued fields

Pablo Cubides Kovacsics, Françoise Delon

摘要:

本文研究了代数闭值域的可定义函数的Tame展开。对于一个给定的可定义函数,我们有两种类型的结果:类型(I),它在无穷大的邻域内成立,和类型(II),它在函数的定义域中的所有点,但不超过100个点的局部成立。在文章的第一部分中,我们展示了关于值群上可定义函数的因子分解的(I)和(II)型结果。作为应用,我们证明了具有值群$\mathbb{Q}$的代数闭值域的Tame展开式(如$\mathbb{C}_p$和$\overline{\mathbb{F}_p}^{alg}(\!(t^\mathbb{Q})\!)$)是多项式有界的.在第二部分中,在对值群的一元可定义函数的渐进行为的额外假设下,我们将这些因式分解扩展到剩余乘法结构$\mathrm{RV}$上。在特征为0时,我们得到一个推论:可定义函数$f\colon X\subseteq K\to K$的定义域可划分为若干集合$F\cup E\cup J$,其中$F$是有限的,$f|E$是局部常数,$f|J$局部满足雅可比性质.

英文摘要:

In this article we study definable functions in tame expansions of algebraically closed valued fields. For a given definable function we have two types of results: of type (I), which hold at a neighborhood of infinity, and of type (II), which hold locally for all but finitely many points in the domain of the function. In the first part of the article, we show type (I) and (II) results concerning factorizations of definable functions over the value group. As an application, we show that tame expansions of algebraically closed valued fields having value group $\mathbb{Q}$ (like $\mathbb{C}_p$ and $\overline{\mathbb{F}_p}^{alg}(\!(t^\mathbb{Q})\!)$) are polynomially bounded. In the second part, under an additional assumption on the asymptotic behavior of unary definable functions of the value group, we extend these factorizations over the residue multiplicative structure $\mathrm{RV}$. In characteristic 0, we obtain as a corollary that the domain of a definable function $f\colon X\subseteq K\to K$ can be partitioned into sets $F\cup E\cup J$, where $F$ is finite, $f|E$ is locally constant and $f|J$ satisfies locally the Jacobian property.

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。

↑