Aut(S_n)≃S_n если только n⩾3 и n - не 6
Дополнительный автоморфизм группы перестановок 6 элементов
По материалам:
, Some thoughts on the number 6,
Howard, Ben; Millson, John; Snowden, Andrew; Vakil, Ravi: A description of the outer automorphism of S_6, and the invariants of six points in projective space, doi:
Ben Webster, The Outer Automorphism of S_6,
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