Robust and optimal control
Robust stability under mixed time-varying, time-invariant and parametric uncertainty
Automatica (Journal of IFAC)
Stability and Robustness of Multivariable Feedback Systems
Stability and Robustness of Multivariable Feedback Systems
Structured Noncommutative Multidimensional Linear Systems
SIAM Journal on Control and Optimization
Noncommutative rational functions, their difference-differential calculus and realizations
Multidimensional Systems and Signal Processing
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We obtain a standard Bounded Real Lemma and a strict Bounded Real Lemma for the class of input/state/output linear systems with evolution along a free semigroup recently introduced by the authors. As an application we show the equivalence of this result with a recent result from robust control theory: the structured 驴-singular value of an operator (taken in a certain uniform sense) is equal to its upper bound computed via diagonal scalings in case the structured singular value is taken with respect to the collection of time-varying perturbations given by a linear-fractional model.