`BookProof.SpectralGapStability.exists_gapAt_of_notMem_spectrum` {A : F →L[ℂ] F} {lam : ℝ} (h : (lam : ℂ) ∉ spectrum ℂ A) : ∃ d > 0, GapAt A lam d

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`BookProof.SpectralGapStability.exists_gapAt_of_notMem_spectrum` {A : F →L[ℂ] F} {lam : ℝ} (h : (lam : ℂ) ∉ spectrum ℂ A) : ∃ d > 0, GapAt A lam d · Prove2Me