Vertex results for uncertain systems

In the spirit of Kharitonov, the robust stability of feedback systems under both structured and unstructured perturbations is discussed. Extreme point results are obtained. The stability margin of an interval system family is achieved at pre-specified twelve vertex systems

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[2]  B. Barmish.  New tools for robustness analysis , 1988, Proceedings of the 27th IEEE Conference on Decision and Control.