History
One of the earliest group automorphisms (automorphism of a group, not simply a group of automorphisms of points) was given by the Irish mathematician William Rowan Hamilton in 1856, in his Icosian Calculus, where he discovered an order two automorphism, writing:
so that is a new fifth root of unity, connected with the former fifth root by relations of perfect reciprocity.
Read more about this topic: Automorphism
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