Let $(G,\mathbb{R}^{2})$ a finite reflection group. Why is $G$ isomorphic to $\mathbb{Z}/2\mathbb{Z}$ or $D_{2n}$ for some $n\geqslant{2}$?

by José Hernandez   Last Updated November 14, 2017 18:20 PM

Let $(G,\mathbb{R}^{2})$ a finite reflection groups. Why is $G$ isomorphic to $\mathbb{Z}/2\mathbb{Z}$ or $D_{2n}$ for some $n\geqslant{2}$?



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