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Campana有理连通性与Del Pezzo轨形族的弱逼近

Campana Rational Connectedness and Weak Approximation of Del Pezzo Orbifolds

Saptarshi Dandapat

arXiv 2609.11533首次发表:更新:

发表机构

Nagoya University(名古屋大学)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本文证明低次及具不可约边界的高次del Pezzo轨形族是强Campana无理性覆盖的,从而推出Campana有理连通性,为弱逼近定理提供二维非环面例子,并在附录中分类了次数6、7、8的情形。

AI 中文摘要

我们证明了次数小于7的del Pezzo轨形族,以及具有不可约边界的高次del Pezzo轨形族是强Campana无理性覆盖的,并由此推断它是Campana有理连通的。这为Campana的一个猜想在二维情形提供了重要的非环面例子,其形式正是弱逼近定理所需的,并在所有一般纤维为此类轨形族的位置上,对Campana纤维化的Campana截面给出了弱逼近。在三个附录中,我们对次数为6、7和8且具有不可约边界的del Pezzo轨形族进行了分类。

英文摘要

We prove that a del Pezzo orbifold of degree less than 7, and del Pezzo orbifolds of higher degree with irreducible boundary are strongly Campana uniruled, and deduce that it is Campana rationally connected. This provides important non-toric examples in dimension two of a conjecture by Campana, in the form required by the weak approximation theorem, and yields weak approximation for Campana sections of Campana fibrations at all places whose general fibre is such an orbifold. In three appendices we classify the del Pezzo orbifolds of degree 6, 7 and 8 with irreducible boundary.

Comments16 pages and 6 pages of appendix

论文原文

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