Question: please explain me!! Let G be a group. Consider the set Aut(G):= {f : G - GJf is an isomorphism } . Elements of Aut(G)

please explain me!!

Let G be a group. Consider the set Aut(G):= {f : G - GJf is an isomorphism } . Elements of Aut(G) are just isomorphisms from G to itself and are usually called automorphisms of G. Show that composition of functions gives a group structure on Aut(G).I

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