The control of uncertain nonlinear systems is a topic that continues to challenge control theoreticians. This topic is also of practical importance since many real-world systems exhibit nonlinear dynamic behavior. To make matters even more difficult, in many practical cases, the mathematical model is poorly known or uncertain. To cope with the uncertainty issue, an abundance of design tools have emerged during the last two decades that facilitate the systematic construction of controllers for various classes of uncertain nonlinear systems.
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