Henrion, Didier; Arzelier, Denis; Peaucelle, Dimitri Positive polynomial matrices and improved LMI robustness conditions. (English) Zbl 1037.93027 Automatica 39, No. 8, 1479-1485 (2003). From the paper’s conclusion: “We have proposed a new approach to derive improved LMI robustness conditions, narrowing the gap between conservative convex quadratic stability conditions and intractable non-convex robust stability conditions. The approach is general enough to treat in a unifying way continuous-time and discrete-time systems in the state-space and polynomial frameworks. It is based on the theory of positive polynomial matrices:…the approach proposed in this paper is also interesting from the numerical point of view.” This paper is very interesting, carefully written, and has a most useful list of references. Reviewer: Johannes W. Nieuwenhuis (Groningen) Cited in 13 Documents MSC: 93B40 Computational methods in systems theory (MSC2010) 15A39 Linear inequalities of matrices 93B35 Sensitivity (robustness) 93D09 Robust stability Keywords:linear systems; robustness; linear matrix inequalities LMI; state-space methods; polynomial methods; positive polynomial matrices Software:SeDuMi; Polynomial Toolbox PDF BibTeX XML Cite \textit{D. Henrion} et al., Automatica 39, No. 8, 1479--1485 (2003; Zbl 1037.93027) Full Text: DOI References: [1] Ackermann, J., Robust control systems with uncertain physical parameters (1993), Springer: Springer Berlin [3] Apkarian, P.; Tuan, H. 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