How can we show that every automorphism of $S_4$ is an inner automorphism ?
Automorphism of $S_4$
3
$\begingroup$
group-theory
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0What are the index 4 subgroups of $S_4$? – 2010-11-04
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0See https://math.stackexchange.com/questions/880776/operatornameauts-4-is-isomorphic-to-s-4 – 2018-10-28