`BookProof.SpectralGapStability.spectrum_disjoint_of_shifted_square_bound` {A : F →L[ℂ] F} (hA : IsSelfAdjoint A) {c q : ℝ} (hq : 0 < q) (hbound : ∀ x : F, q * ‖x‖ ^ 2 ≤ ‖(A

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`BookProof.SpectralGapStability.spectrum_disjoint_of_shifted_square_bound` {A : F →L[ℂ] F} (hA : IsSelfAdjoint A) {c q : ℝ} (hq : 0 < q) (hbound : ∀ x : F, q * ‖x‖ ^ 2 ≤ ‖(A - (c : · Prove2Me