Group theory 16: Automorphisms of cyclic groups

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This lecture is part of an online mathematics course on group theory. It is mostly about the structure of the group of automorphisms of a cyclic group. As an application we classify the groups of order pq for primes p, q.
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Minor correction at 20:18 and 20:29: there should be no star on the right had side

vs-cwwc
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Sir I have one question....
Automorphism of Dn is isomorphic to which group ??
(Here Dn is dihedral group).
I have only idea of its order.... Order of Aut(Dn) is n × phi(n).

The_Pi_Piper