theorem spiral_iff_discriminant_neg {tr det : ℝ} : jacobianDiscriminant tr det < 0 ↔ tr ^ 2 < 4 * det := by simp only [jacobianDiscriminant]; constructor <;> intro h <;> linarith
thesis/CESProofs/Dynamics/CoupledRhoT.lean:88
Coupled (ρ, T) Jacobian Analysis