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Aug 20, 2019 at 20:20 comment added ACL This proof is an elementary variant of Artin's proof: it constructs directly the “dévissage” of a 2-group (which is necessarily nilpotent) via its translation action on the set of unordered pairs.
May 31, 2015 at 22:47 comment added Goldstern Here is the proof, as an "unconventional type of induction": mathoverflow.net/a/166014/14915
S Nov 7, 2013 at 5:39 history answered Yuri Sulyma CC BY-SA 3.0
S Nov 7, 2013 at 5:39 history made wiki Post Made Community Wiki by Yuri Sulyma