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arXiv 1305.5366math.AG
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仿射ruled surfaces的变形等价性

Deformation equivalence of affine ruled surfaces

Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg

摘要:

一个光滑的曲面族$φ:\mathcal V\to S$称为{ \em可完备},如果在$S$上有一个对数变形$(\bar {\mathcal V},{\mathcal D})$,使得${\mathcal V}=\bar{\mathcal V}\backslash {\mathcal D}$。两个光滑曲面$V$和$V'$被称为彼此的变形,如果在一个连通的基底上有一个光滑曲面的可完全平坦族${\mathcal V}\to S$,使得$V$和$V'$是在适当点$s,s'\in S$上的纤维。该关系生成称为{ \em变形等价}的等价关系。在本文中,我们给出了一个完整的组合描述这种关系的情况下,仿射直纹曲面,这是由定义的表面,承认一个仿射裁决$V\to B$在仿射基可能退化纤维。特别是,我们构建完整的家庭等仿射直纹面。在一些特殊情况下,我们还可以推出粗模空间的存在性。

英文摘要:

A smooth family $φ:\mathcal V\to S$ of surfaces will be called {\em completable} if there is a logarithmic deformation $(\bar {\mathcal V},{\mathcal D})$ over $S$ so that ${\mathcal V}=\bar{\mathcal V}\backslash {\mathcal D}$. Two smooth surfaces $V$ and $V'$ are said to be deformations of each other if there is a completable flat family ${\mathcal V}\to S$ of smooth surfaces over a connected base so that $V$ and $V'$ are fibers over suitable points $s,s'\in S$. This relation generates an equivalence relation called {\em deformation equivalence}. In this paper we give a complete combinatorial description of this relation in the case of affine ruled surfaces, which by definition are surfaces that admit an affine ruling $V\to B$ over an affine base with possibly degenerate fibers. In particular we construct complete families of such affine ruled surfaces. In a few particular cases we can also deduce the existence of a coarse moduli space.

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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