Stabilization of uncertain systems with norm bounded uncertainty-a control
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A robust stabilization problem in a state-space setting is treated. It is assumed that the states are available for feedback. Using a fixed Lyapunov function approach (quadratic stability) it is shown that an open loop stabilizability condition is equivalent to the existence of a stabilizing memoryless linear state-feedback controller. As a consequence, it is shown that the existence of a quadratically stabilizing nonlinear time-varying dynamic state-feedback controller implies the existence of a quadratically stabilizing memoryless linear time-invariant state-feedback compensator.