Tame coverings of arithmetic schemes

Tame coverings of arithmetic schemes
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驯服算术方案的覆盖

DOI:
10.1007/s002080100262
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发表时间:
2000
影响因子:
1.4
通讯作者:
A. Schmidt
A. Schmidt
中科院分区:
数学2区
文献类型:
--
作者:
A. Schmidt

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我们将一对 (X,D) 的驯服覆盖概念扩展为一对 (X,Y),其中 X 是正则方案,D 是正规交叉除数(参见 SGA1),其中 X 是任意方案,Y 是 X 中的闭子集。我们证明,平坦且在 Spec(Z) 上具有有限类型的正则方案的阿贝尔化驯服基本群是有限的,并且不依赖于特定紧化的选择。
We extend the notion of a tame covering of a pair (X,D) where X is a regular scheme and D is a normal crossing divisor (cf. SGA1), to pairs (X,Y) where X is an arbitrary scheme and Y is a closed subset in X. We show that the abelianized tame fundamental group of a regular scheme which is flat and of finite type over Spec(Z) is finite and does not depend on the choice of a particular compactification.