Abstract.
For discrete-time causal linear input/state/output systems, the Bounded Real Lemma explains (under suitable hypotheses) the contractivity of the values of the transfer function over the unit disk for such a system in terms of the existence of a positive-definite solution of a certain Linear Matrix Inequality (the Kalman–Yakubovich–Popov (KYP) inequality). Recent work has extended this result to the setting of infinite-dimensional state space and associated non-rationality of the transfer function, where at least in some cases unbounded solutions of the generalized KYP-inequality are required. This paper is the second installment in a series of papers on the Bounded Real Lemma and the KYP-inequality. We adapt Willems’ storage-function approach to the infinite-dimensional linear setting, and in this way reprove various results presented in the first installment, where they were obtained as applications of infinite-dimensional State-Space-Similarity theorems, rather than via explicit computation of storage functions.
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Ball, J.A., Groenewald, G.J., ter Horst, S. (2018). Standard versus strict Bounded Real Lemma with infinite-dimensional state space II: The storage function approach. In: Böttcher, A., Potts, D., Stollmann, P., Wenzel, D. (eds) The Diversity and Beauty of Applied Operator Theory. Operator Theory: Advances and Applications, vol 268. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-75996-8_1
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DOI: https://doi.org/10.1007/978-3-319-75996-8_1
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Publisher Name: Birkhäuser, Cham
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Online ISBN: 978-3-319-75996-8
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