G - Finite Group
T - Automorphism of G
For all x in G, T(x) = x IFF x=1
Also, T(T(x))=x for all x in G.
Prove G is abelian.
Struggling a lot with this. I suspect .
And once I establish this, proving G is abelian is simple.
But not going anywhere with the hunch of .
Any pointers please?