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Book Review: Robust Control System Design Using H-infinity and Related Methods

The development of control theory since about 1980 can be seen as a protracted return to the ideas and principles established by Bode in the 1940s, but one which also led to considerable generalisations of these ideas. Notions such as the sensitivity function and stability margins, which were rather eclipsed by the LQG theory which dominated the 1960s and 1970s, have been re-established as central to the objectives of using feedback. They have been successfully extended to multivariable systems, in ways which are far from obvious.