## Feedback and optimal sensitivity: Model reference transformations, multiplicative seminorms, and approximate inverses.(English)Zbl 0474.93025

### MSC:

 93B35 Sensitivity (robustness) 93D15 Stabilization of systems by feedback 93B25 Algebraic methods 93C99 Model systems in control theory 93C35 Multivariable systems, multidimensional control systems 93D25 Input-output approaches in control theory 93E11 Filtering in stochastic control theory 46J15 Banach algebras of differentiable or analytic functions, $$H^p$$-spaces 32A35 $$H^p$$-spaces, Nevanlinna spaces of functions in several complex variables 32A38 Algebras of holomorphic functions of several complex variables
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