- #1
Poopsilon
- 294
- 1
So if a group can be interpreted as the symmetry of some object, abstract or tangible, than should I think of its automorphism group as the symmetry of the group itself? And so then the automorphism group of the automorphism group of the group is the symmetry of the symmetry of the group, ad nauseam?
I've been looking ahead at Galois Theory and it seems like these automorphism groups play a pretty central role so I'd like to know how to think about them. What is the significance of the fact that Aut(D_4) is isomorphic to D_4 itself? Why would that be the case? Is there some property of the square that would hint at why this is so?
I've been looking ahead at Galois Theory and it seems like these automorphism groups play a pretty central role so I'd like to know how to think about them. What is the significance of the fact that Aut(D_4) is isomorphic to D_4 itself? Why would that be the case? Is there some property of the square that would hint at why this is so?