Abstract

Abstract Diamond and simplex models are useful in dealing with systems under parameter perturbations. A diamond (simplex) stability region  is an open set in the complex plane with the property that if the zeros of all vertex polynomials of any diamond (simplex) family are all in , then the zeros of all the polynomials of this family are all in . It is shown that some typical stability regions used in control systems design are diamond (simplex) stability regions. Some discussions and extensions are also presented.

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