∀ (p₁ p₂ p₃ : Lean.Grind.Linarith.Poly),
  Lean.Grind.Linarith.le_lt_combine_cert p₁ p₂ p₃ =
    (decide (↑p₁.leadCoeff.natAbs > 0) && p₃ == (p₁.mul ↑p₂.leadCoeff.natAbs).combine (p₂.mul ↑p₁.leadCoeff.natAbs))