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arXiv 1405.6872math.AG
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零星$\mathbb{C}^*$ -嵌入$\mathbb{C}^2$的几何

The geometry of sporadic $\mathbb{C}^*$-embeddings into $\mathbb{C}^2$

Mariusz Koras, Karol Palka, Peter Russell

摘要:

$\mathbb{C}^*=\mathbb{C}^1\setminus\{0\}$到$\mathbb{C}^2$的闭代数嵌入是“零星的”,如果对于同构于仿射线的每条曲线$A\subseteq \mathbb{C}^2$,与$\mathbb{C}^*$的交点至少是$2$。非偶发嵌入已被分类。很少有已知的零星嵌入。我们建立了几何和代数工具来分类它们的最小对数分辨率$(X,D)\to (\mathbb{P}^2,U)$的分析的基础上,其中$U$是$\mathbb{C}^*$上$\mathbb{P}^2$的封闭。我们特别表明,人们可以选择坐标上的$\mathbb{C}^2$,其中在无穷大的类型的$\mathbb{C}^*$和自相交的适当的$X$上的变换是急剧限制。

英文摘要:

A closed algebraic embedding of $\mathbb{C}^*=\mathbb{C}^1\setminus\{0\}$ into $\mathbb{C}^2$ is 'sporadic' if for every curve $A\subseteq \mathbb{C}^2$ isomorphic to an affine line the intersection with $\mathbb{C}^*$ is at least $2$. Non-sporadic embeddings have been classified. There are very few known sporadic embeddings. We establish geometric and algebraic tools to classify them based on the analysis of the minimal log resolution $(X,D)\to (\mathbb{P}^2,U)$, where $U$ is the closure of $\mathbb{C}^*$ on $\mathbb{P}^2$. We show in particular that one can choose coordinates on $\mathbb{C}^2$ in which the type at infinity of the $\mathbb{C}^*$ and the self-intersection of its proper transform on $X$ are sharply limited.

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