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`BookProof.SpectralGapStability.spectrum_disjoint_of_uniform_window` {A : ℕ → F →L[ℂ] F} {B : F →L[ℂ] F} (hB : IsSelfAdjoint B) {a b : ℝ} (hgap : ∀ lam ∈ Set.Ioo a b, ∀ m, GapAt (A · Prove2Me