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Dec 15, 2015 at 5:44 comment added David Hill There are multiple conventions. It is not uncommon to write $D_{2n}$ for the dihedral group of a regular $n$-gon. It has order $2n$.
Dec 15, 2015 at 4:57 comment added mathchai In the example do you mean $D_4$?
Dec 15, 2015 at 4:21 comment added David Hill Yes, I am including reflections (the same method works if you don't.)
Dec 15, 2015 at 4:16 comment added mathchai Would this be the case where reflections don't count either?
Dec 14, 2015 at 22:57 history answered David Hill CC BY-SA 3.0