# Tag Archives: derived functors

## Dihedral Groups and Automorphisms, Part 2

Welcome back readers! In the last post, Dihedral Groups and Automorphisms, Part 1 we introduced the dihedral group. To briefly recap, the dihedral group $D_n$ of order $2n$ for $n\geq 3$ is the symmetry group of the regular Euclidean $n$-gon. Any dihedral group is generated by a reflection and a certain […]