Abelian Subgroups of Pro-2 Galois Groups

Ido Efrat
1995 Proceedings of the American Mathematical Society  
Let a{K) be the maximal cardinality |/| such that Z'2 is a closed subgroup of the maximal pro-2 Galois group of a field K . We prove estimates on a(K) conjectured by Ware.
doi:10.2307/2160698 fatcat:exlxjuazabdcrflju7sb4czfoe