If you only care about the result: Aut(D_2n) is isomorphic to the semi-direct
product
Z/n x| (Z/n)^x
for the natural action of the units on the ring. You can even take n = \infty
in that formula.
> On Jul 18, 2016, at 11:56 AM, abdulhakeem alayiwola <lovepgro...@gmail.com>
> wrote:
>
> Dear forum,
> Can anyone in the house describe the steps to find Aut(D2n) using GAP.
> Note that Aut(D2n) is Automorphism group of Dihedral group of order 2n.
> Regards.
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