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`BookProof.ChapterAbelianCyclicCommutant.abelian_algebra_maximal_abelian_of_cyclic` (rho : A →⋆ₐ[ℂ] (H →L[ℂ] H)) (xi : H) (hcyc : DenseRange fun a : A => rho a xi) : (Set.range fun · Prove2Me