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Smooth stabilization implies coprime factorization. (English) Zbl 0682.93045
The main theorem states that if a nonlinear system x ˙=f(x)+G(x)u can be made globally asymptotically stable by a smooth feedback u=K(x), then there also exists a smooth feedback u=K ' (x)+v such that the feedback modified system is input-to-state stable. The construction of K ' (x) is given explicitly for feedback linearizable systems, which are trivially smoothly stabilizable. Based upon this main result it is also shown that smoothly stabilizable systems admit coprime factorizations. Finally some results about input-to-output stability are given.
Reviewer: A.van der Schaft

MSC:
93D15Stabilization of systems by feedback
93B28Operator-theoretic methods in systems theory
47A68Factorization theory of linear operators
93C10Nonlinear control systems
93D25Input-output approaches to stability of control systems