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arXiv 1005.2142math.AG
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正特征线椭圆纤维丛的形变

Deformations of elliptic fibre bundles in positive characteristic

Holger Partsch

摘要:

研究了正特征曲线上椭圆纤维丛的形变理论。作为应用,我们给出了特征二和特征三的不可升椭圆曲面的例子,回答了Katalina和Ueno的一个问题。同时,我们构造了一类椭圆纤维化,它的可升性等价于F.关于曲线自同构的可升性。最后,我们对双椭圆曲面的变形进行了分类。

英文摘要:

We study deformation theory of elliptic fibre bundles over curves in positive characteristics. As applications, we give examples of non-liftable elliptic surfaces in charactertic two and three, which answers a question of Katsura and Ueno. Also, we construct a class of elliptic fibrations, whose liftability is equivalent to a conjecture of F. Oort concerning the liftability of automorphisms of curves. Finally, we classify deformations of bielliptic surfaces.

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