Answer to Question #23874 in Abstract Algebra for Hym@n B@ss

Question #23874
Let e = (Sum over g∈G) a_g * g ∈ kG be an idempotent, where k is a field and G is a finite group. Let χ be the character of G afforded by the kG-module kG • e. Show that for any h ∈ G, χ(h) = |CG(h)| (Sum over g∈C)•a_g,
where C denotes the conjugacy class of h^−1 in G.
1
Expert's answer
2013-02-15T06:08:42-0500
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