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`BookProof.ChapterMackeyQuasiInvariant.dens_eq_one_of_invariant` {μ : Measure X} [SigmaFinite μ] (hinv : ∀ g : G, (μ.map fun x : X => g • x) = μ) (g : G) : dens μ g =ᵐ[μ] fun _ => · Prove2Me