Answer to Question #18565 in Algebra for Irvin

Question #18565
Let G be the dihedral group of order 2n generated by two elements r, s with relations rn = 1, s2 = 1 and srs^−1 = r^−1. Let θ = 2π/n. For any integer h (0 ≤ h ≤ n), show that Dh(r) = cos hθ −sin hθ sin hθ cos hθ Dh(s) =_ 1 0 0 −1 defines a real representation of G.
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