theorem coupled_3d_instability {a_ρρ a_TT a_JJ : ℝ} (htrace : 0 < jacobian3DTrace a_ρρ a_TT a_JJ) : 0 < a_ρρ + a_TT + a_JJ := instability_from_trace htrace
thesis/CESProofs/Dynamics/CoupledRhoT.lean:215
## Coupled (ρ, T, J) System (merged from CoupledSystem.lean)