Galois rigidity of the étale fundamental groups of punctured projective lines.

Galois rigidity of the étale fundamental groups of punctured projective lines.
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刺穿射影线的étale基本群的伽罗瓦刚性。

DOI:
10.1515/crll.1990.411.205
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发表时间:
1990
期刊:
Journal für die reine und angewandte Mathematik (Crelles Journal)
影响因子:
--
通讯作者:
Hiroaki Nakamura
Hiroaki Nakamura
中科院分区:
--
文献类型:
--
作者:
Hiroaki Nakamura

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在本文中,我们证明了一条穿孔射影直线(具有基域的绝对伽罗瓦群的正则外作用)的标准基本群决定了该直线上删除点的相对位置,只要基域是在有理数上生成的.所谓域f c上的穿孔射影线,我们指的是k上的射影线,其中有效地删除了n个f c-有理点。
In this paper, we show that the etale fundamental group of a punctured projective line (with canonical exterior action of the absolute Galois group of the base field) determines the relative positions of the deleted points on the line, provided that the base field is finitely generated over ®, the rationals. By a punctured projective line over a field /c, we mean the projective line over k with finitely many /c-rational points effectively deleted.