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arXiv 0710.4514math.NTmath.ATmath.LO
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代数数域的外基本群

The External Fundamental Group of an Algebraic Number Field

T. M. Gendron

摘要:

我们关联到每一个代数数域双曲曲面层和外部基本群:后者的基本胚芽,必然包含外部(不是一阶可定义的)元素的推广。有理数的外基本群是绝对伽罗瓦群的分裂扩张,它在理论上包含一个子群,其阿贝尔化同构于Idele类群。

英文摘要:

We associate to every algebraic number field a hyperbolic surface lamination and an external fundamental group: the latter a generalization of the fundamental germ that necessarily contains external (not first order definable) elements. The external fundamental group of the rationals is a split extension of the absolute Galois group, that conjecturally contains a subgroup whose abelianization is isomorphic to the idele class group.

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