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arXiv 1806.04554math.AG
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一次奇异del Pezzo纤维化的双有理刚性

On birational rigidity of singular del Pezzo fibrations of degree 1

Takuzo Okada

摘要:

本文给出了$\frac{1}{2} (1,1,1)$奇点的delPezzo纤维化的双有理超刚性的一个充分条件,推广了所谓的$K^2$ -条件.作为应用,我们还证明了在$\mathbb{P}^1$上的环面$\mathbb{P} (1,1,2,3)$ -丛中只嵌入$\frac{1}{2} (1,1,1)$奇点的度$1$的del Pezzo纤维化是双有理超刚性的当且仅当它满足$K$ -条件.

英文摘要:

We give a sufficient condition for birational superrigidity of del Pezzo fibrations of degree $1$ with only $\frac{1}{2} (1,1,1)$ singular points, generalizing the so called $K^2$-condition. As an application, we also prove that a del Pezzo fibrations of degree $1$ with only $\frac{1}{2} (1,1,1)$ singular points embedded in a toric $\mathbb{P} (1,1,2,3)$-bundle over $\mathbb{P}^1$ is birationally superrigid if and only if it satisfies the $K$-condition.

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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