On the slope of bielliptic fibrations

On the slope of bielliptic fibrations
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DOI:
10.1090/s0002-9939-00-05865-2
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发表时间:
2000-12
期刊:
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影响因子:
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通讯作者:
M. A. Barja
M. A. Barja
中科院分区:
其他
文献类型:
--
作者:
M. A. Barja

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设$\pi:S\longrightarrow B$为双椭圆纤维化。我们证明了$S$是,直到基地的变化,一个合理的双覆盖的椭圆纤维化和$\pi $是isovarious提供它是光滑的。最后,我们证明了$\pi $的斜率至少是4,只要纤维的亏格至少是6。
Let $\pi :S\longrightarrow B$ be a bielliptic fibration. We prove $S$ is, up to base change, a rational double cover of an elliptic fibration and that $\pi $ is isotrivial provided it is smooth. Finally, we prove that the slope of $\pi $ is at least four provided the genus of the fibre is at least six.