Properties of the realization of inner functions

Jacob, Birgit and Zwart, Hans (2002) Properties of the realization of inner functions. Mathematics of Control, Signals, and Systems, 15 (4). pp. 356-379. ISSN 0932-4194

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Abstract:	In this paper we investigate fundamental properties of state-space realizations for inner functions. We derive necessary and sufficient conditions for the inner function to have a realization such that the associated $C_0$ -semigroup is exponentially stable. Furthermore, we give necessary and sufficient conditions on the inner function such that the $C_0$ -semigroup is a group. Combining these results, we have that the $C_0$ -semigroup is an exponentially stable $C_0$ -group if and only if the inner function is the product of a constant of modulus one and a Blaschke product for which the zeros satisfy the Carleson-Newman condition and the zeros lie in a vertical strip bounded away from the imaginary axis.
Item Type:	Article
Copyright:	© 2002 Springer
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Mathematical Systems and Control Theory (MSCT)
Link to this item:	http://purl.utwente.nl/publications/68682
Official URL:	http://dx.doi.org/10.1007/s004980200015
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