The External Fundamental Group of an Algebraic Number Field

Details The External Fundamental Group of an Algebraic Number Field The External Fundamental Group of an Algebraic Number Field

2007-10-24

arxiv.org/abs/0710.4514v2

Mathematics

Number Theory

4 pages

Scientific paper

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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