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arXiv 0709.0284math.AGmath.GR
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奥尔特群与提升问题

Oort groups and lifting problems

Ted Chinburg, Robert Guralnick, David Harbater

摘要:

设k是具有正特征p的代数闭域。我们考虑哪些有限群G具有这样的性质:G在k上连通光滑射影曲线上的每个忠实作用都提升到特征零。奥尔特证明了循环群具有这种性质。我们证明了如果p圈群G具有这一性质,则G必是圈群或二面体群,特征2中的A_4除外。这证明了奥尔特猜想的一个强形式的一个方向。

英文摘要:

Let k be an algebraically closed field of positive characteristic p. We consider which finite groups G have the property that every faithful action of G on a connected smooth projective curve over k lifts to characteristic zero. Oort conjectured that cyclic groups have this property. We show that if a cyclic-by-p group G has this property, then G must be either cyclic or dihedral, with the exception of A_4 in characteristic 2. This proves one direction of a strong form of the Oort Conjecture.

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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