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arXiv 2403.17397math.AGmath.AC
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关于仿射三维簇族 $a(x)y=F(x,z,t)$

On the family of affine threefolds $a(x)y=F(x,z,t)$

Parnashree Ghosh, Neena Gupta, Ananya Pal

AI总结:

本文利用 $K$-理论与 $\mathbb{G}_a$-作用研究任意域上 $a(X)Y=F(X,Z,T)$ 型仿射三维簇,给出其为超平面的等价条件,并在两类情形下证明 Abhyankar-Sathaye 猜想。

摘要:

近几十年来,线性仿射三维簇使研究人员能够解决仿射空间上的一些挑战性问题。Koras-Russell 三维簇,尤其是 $\mathbb{C}$ 上的 Russell 三次曲面和正特征域上的 Asanuma 三维簇,是此类线性三维簇的突出例子。本文将 $K$-理论和 $\mathbb{G}_a$-作用理论的工具应用于任意域 $k$ 上形如 $G:=a(X)Y-F(X,Z,T)\in k[X,Y,Z,T]$ 的线性三维簇。在以下情形中,我们给出了 $G$ 成为超平面(即 $k[X,Y,Z,T]/(G)=k^{[3]}$)的若干等价条件:(i)$k$ 为特征零域;(ii)$k$ 为任意域且 $a(X)$ 仅有重根。我们还在这些情形中肯定地确立了 Abhyankar-Sathaye 猜想。

英文摘要:

In recent decades, linear affine threefolds have enabled researchers to solve some of the challenging problems on affine spaces. Koras-Russell threefolds, especially the Russell Cubic over $\mathbb{C}$ and Asanuma threefolds over a field of positive characteristic, are striking examples of such linear threefolds.In this paper, we apply tools from $K$-theory and theory of $\mathbb{G}_a$-actions to linear threefolds of the form $G:=a(X)Y-F(X,Z,T)\in k[X,Y,Z,T]$, over an arbitrary field $k$. We give some equivalent conditions for $G$ to be a hyperplane (i.e., $k[X,Y,Z,T]/(G)=k^{[3]}$) in the following cases: (i) $k$ is a field of characteristic zero (ii) $k$ is an arbitrary field and $a(X)$ has only multiple roots. We also establish the Abhyankar-Sathaye Conjecture affirmatively in these cases.

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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