theorem trace_negative {df_rho_drho df_T_dT : ℝ} (h1 : df_rho_drho < 0) (h2 : df_T_dT < 0) : jacobianTrace df_rho_drho df_T_dT < 0 := by simp only [jacobianTrace]; linarith
thesis/CESProofs/Dynamics/CoupledRhoT.lean:49
Coupled (ρ, T) Jacobian Analysis