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`BookProof.ChapterAbelianCyclicModel.abelian_algebra_multiplication_model` (rho : A →⋆ₐ[ℂ] (H →L[ℂ] H)) (xi : H) (hxi : ‖xi‖ = 1) (hcyc : DenseRange fun a : A => rho a xi) : ∃ (mu · Prove2Me