93D05 Lyapunov and other classical stabilities (Lagrange, Poisson, $L^p, l^p$, etc.) 93D09 Robust stability 93D10 Popov-type stability of feedback systems 93D15 Stabilization of systems by feedback 93D20 Asymptotic stability 93D21 Adaptive and robust stabilization 93D22 Interrelations between stability problems and optimization problems 93D25 Input-output approaches 93D30 Scalar and vector Lyapunov functions 93D99 None of the above but in this section