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arXiv 0905.0047math.AGmath.NT
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有理ruled surface上的分裂曲线、超椭圆纤维化的Mordell-Weil群和Zakenki对

Splitting curves on a rational ruled surface, the Mordell-Weil groups of hyperelliptic fibrations and Zariski pairs

Hiro-o Tokunaga

摘要:

设$Σ$为光滑射影曲面,$f' : S' \to Σ$为$Σ$的双覆盖,$μ: S \to S'$为正则分解.放入$f = f'\circμ$。如果$f^*C$的形式为$C^+ + C^- + E$,则称$Σ$上的不可约曲线$C$是关于$f$的分裂曲线,其中$C^- = σ_f^*C^+$,$σ_f$是$f$的覆盖变换,并且$E$的所有不可约分量都包含在$μ$的例外集中。本文证明了有理直纹曲面上某对曲线的分裂曲线的一种“互易性”。作为应用,我们考虑了有理直纹曲面上某些曲线的补曲线的拓扑。

英文摘要:

Let $Σ$ be a smooth projective surface, let $f' : S' \to Σ$ be a double cover of $Σ$ and let $μ: S \to S'$ be the canonical resolution. Put $f = f'\circμ$. An irreducible curve $C$ on $Σ$ is said to be a splitting curve with respect to $f$ if $f^*C$ is of the form $C^+ + C^- + E$, where $C^- = σ_f^*C^+$, $σ_f$ being the covering transformation of $f$ and all irreducible components of $E$ are contained in the exceptional set of $μ$. In this article, we show that a kind of "reciprocity" of splitting curves holds for a certain pair of curves on rational ruled surfaces. As an application, we consider the topology of the complements of certain curves on rational ruled surfaces.

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