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Apr 16, 2019 at 21:17 comment added user137767 and many believe that a subgroup of an abelian group is normal (which I also believe).
Jul 3, 2018 at 22:49 comment added Gerry Myerson And many other students believe every normal subgroup is an abelian subgroup.
S Nov 21, 2014 at 10:31 history answered Denis Serre CC BY-SA 3.0
S Nov 21, 2014 at 10:31 history made wiki Post Made Community Wiki by Denis Serre