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`BookProof.ClosureUniqueness.factorGraph_quadForm_nonneg` {A : D →ₗ[ℂ] F} {p : F × F} (hp : p ∈ factorGraph A) : 0 ≤ (inner ℂ p.1 p.2 : ℂ).re ∧ (inner ℂ p.1 p.2 : ℂ).im = 0 · Prove2Me