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9 - Semi-bounded State/Signal Systems

Published online by Cambridge University Press:  05 May 2022

Damir Z. Arov
Affiliation:
South Ukrainian Pedagogical University
Olof J. Staffans
Affiliation:
Åbo Akademi University, Finland
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Summary

This chapter is a state/signal counterpart to Chapter 8. We recall that a s/s system is bounded if and only if it has at least one bounded i/s/o representation. In the semi-bounded setting, we turn this property into a definition and say that a s/s system is semi-bounded if it has at least one semi-bounded i/s/o representation. Most of the results presented in Chapter 7 for bounded s/s systems remain valid in one form or another for semi-bounded s/s systems, but there is one major exception: in the case of a bounded s/s system, the direction of time does not play an important role, i.e., most of the results that are true in the forward time direction are also true in the backward time direction. This is no longer true in the semi-bounded case. The even larger class of well-posed s/s systems is discussed in Chapter 15, and many of the results in the present chapter remain valid even in the well-posed setting.

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Publisher: Cambridge University Press
Print publication year: 2022

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