Question: Let S be a set, and let a be a fixed element of S. Show that {o e Sym(S) |o(a)=a} is a subgroup of

Let S be a set, and let a be a fixed element

Let S be a set, and let a be a fixed element of S. Show that {o e Sym(S) |o(a)=a} is a subgroup of Sym(S).

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