The problems of robust stability and robust stabilization of linear state-spacesystems with parameter uncertainties have been extensively studied in thepast decades [25Among the different approaches that deal with these problemsbased on the concepts of quadratic stability and quadratic stabilizability havebecome popular. An uncertain system is quadratically stable if there exists afixed Lyapunov function to infer the stability of the uncertain systeman uncertain system is quadratically stabiliza
