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Vietnam Journal of Mathematics 36:2(2008) 239-251  Controllability Radius of Linear Systems with Perturbed Control Sets Nguyen Khoa Son and Do Duc Thuan Abstract.  In this paper we study controllability of linear systems with constrained controls under the assumption that the set of control parameters is subjected to perturbations. The notion of controllability radius is introduced and some formulas for its computation are derived. Examples are given to illustrate the obtained results.   2000 Mathematics Subject Classification: 06B99, 34D99, 47A10, 47A99, 65P99. Keywords: Linear systems, constrained controls, controllability radius.

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