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`BookProof.ChapterMaschkeFiniteGroup.avgProj_apply` [Fintype G] (ρ : Representation ℂ G V) (pi : V →ₗ[ℂ] V) (x : V) : avgProj ρ pi x = (Fintype.card G : ℂ)⁻¹ • ∑ g : G, ρ g (pi (ρ · Prove2Me