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arXiv 1509.09220math.AG
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关于$\leq 4$次的del Pezzo椭圆簇

On del Pezzo elliptic varieties of degree $\leq 4$

Antonio Laface, Andrea Luigi Tironi, Luca Ugaglia

摘要:

令\special{html:<a href="hrefstring">}是度$d\leq 4$和维数$n\geq 3$的del Pezzo簇,令$H$是一个样本类,使得$-K_Y=(n-1)H$和令$Z\subset Y$是一个长度为$d$的$0$维子概型,使得$|H|$的元素子系统以基轨迹$Z$给出一个有理态射$π_Z\colon Y\dashrightarrow{\mathbb P}^{n-1}$ .用$π\colon X\to {\mathbb P}^{n-1}$表示通过求解$π_Z$的不定轨迹而得到的椭圆纤维化。推广了[arXiv:1305.3340]的结果,研究了簇$X$的几何,证明了$π$的Mordell-Weil群是有限的当且仅当$X$的Cox环是双生成的.

英文摘要:

\special{html:<a href="hrefstring">} Let $Y$ be a del Pezzo variety of degree $d\leq 4$ and dimension $n\geq 3$, let $H$ be an ample class such that $-K_Y=(n-1)H$ and let $Z\subset Y$ be a $0$-dimensional subscheme of length $d$ such that the subsystem of elements of $|H|$ with base locus $Z$ gives a rational morphism $π_Z\colon Y\dashrightarrow{\mathbb P}^{n-1}$. Denote by $π\colon X\to {\mathbb P}^{n-1}$ the elliptic fibration obtained by resolving the indeterminacy locus of $π_Z$. Extending the results of [arXiv:1305.3340] we study the geometry of the variety $X$ and we prove that the Mordell-Weil group of $π$ is finite if and only if the Cox ring of $X$ is finitely generated.

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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