Induced two-dimensional dihedral representation
= Induced two-dimensional dihedral representation
For $\lambda\ne\pm1$, the rotation acts by $\operatorname{diag}(\lambda,\lambda^{-1})$ and the reflection interchanges the two eigenlines.
= Induced two-dimensional dihedral representation
For $\lambda\ne\pm1$, the rotation acts by $\operatorname{diag}(\lambda,\lambda^{-1})$ and the reflection interchanges the two eigenlines.