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On nonsingularity verification of uncertain matrices over a quadratically constrained set. (English) Zbl 1368.93242
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##### MSC:
 93B60 Eigenvalue problems 93D05 Lyapunov and other classical stabilities (Lagrange, Poisson, $$L^p, l^p$$, etc.) in control theory 47A56 Functions whose values are linear operators (operator- and matrix-valued functions, etc., including analytic and meromorphic ones)
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