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`BookProof.ShiftedQuadraticDegenerate.diagonal_degenerate_essentiallySelfAdjoint` (c b b' : Fin d → ℝ) (hb : ∀ i, c i = 0 → b i = 0) (hb' : ∀ i, c i = 0 → b' i = 0) : EssentiallySe · Prove2Me