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`BookProof.ShiftedQuadraticMatrix.shiftedHMatPoly_eq_quadPolyMat` (a k : Vd d) {A : Matrix (Fin d) (Fin d) ℝ} (hsym : ∀ i j, A i j = A j i) (b b' : Fin d → ℝ) (ha : ∀ i, ∑ j, A i j · Prove2Me