Talk:Profinite integer

Someone should add: the abelianization map identifies the absolue Galois group G of Q with ${\widehat {\mathbb {Z} }}^{*}$ (class field theory?) Put in another way the non-abelian-ness of profinite integers are hidden in the commutator subgroup of G (this stuff is beyond me). -- Taku (talk) 02:55, 27 April 2015 (UTC)