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For arbitrary second order square matrices A, B, C; A Hurwitz stable, the minimum positive value R for which the differential inclusion ẋ ∈ FR(x) := {(A + B∆C)x, ∆ ∈ R2×2, ‖∆‖ ≤ R} fails to be asymptotically stable is calculated, where ‖ · ‖ denotes the operator norm of a matrix.

Stability radius of second order linear structured differential inclusions