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Nonlinear Control Sy.. - Free

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162 CHAPTER 6. INPUT-OUTPUT STABILITY<br />

For simplicity we will usually say that H is input-output stable instead of inputoutput<br />

X-stable whenever confusion is unlikely. It is clear that input-output stability is a<br />

notion that depends both on the system and the space of functions.<br />

One of the most useful concepts associated with systems is the notion of gain.<br />

Definition 6.7 A system H : Xe -4 Xe is said to have a finite gain if there exists a<br />

constant y(H) < oo called the gain of H, and a constant,3 E pl+ such that<br />

II(Hu)TIIX

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