Abstract
A simple geometric test can be applied to evaluateG-stability of a polytope of matrices. In case of a regionG being a convex subset of the complex plane, it suffices to assume that four (for some regions even less) corner points of a certain rectangle are contained inG.
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Solak, M.K., Peng, A.C. Eigenvalue localization ofG-stable matrix polytopes. Multidim Syst Sign Process 5, 307–318 (1994). https://doi.org/10.1007/BF00980713
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DOI: https://doi.org/10.1007/BF00980713