Abstract
A recent paper (Ref. 1) established a new approach to estimate the robust stability radius of a Schur polynomial. This note points out that the approach given in Ref. 1 is not correct and also gives a counterexample to the main result of Ref. 1.
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References
MASTORAKIS, N. E., Optimum Radius of Robust Stability for Schur Polynomials, Journal of Optimization Theory and Applications, Vol. 104, No. 1, pp. 165-174, 2000.
MASTORAKIS, N. E., Robust Stability of Polynomials: New Approach, Journal of Optimization Theory and Applications, Vol. 93, No. 3, pp. 635-638, 1997.
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Gao, L., Sun, Y. On the Optimum Radius of Robust Stability for Schur Polynomials. Journal of Optimization Theory and Applications 114, 471–475 (2002). https://doi.org/10.1023/A:1016048020886
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DOI: https://doi.org/10.1023/A:1016048020886