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1. Notion of system
1.1 Definitions
The notion of a system is not easy to define. It seems simpler to us to try to approach this notion from its various attributes. Thus, we can say that a system is "something" that transforms certain quantities u i (t ), called input quantities, into certain others y j (t ), called output quantities, as shown in figure 1 . This definition is very general. Input quantities u i (t ) are those which act on the system, while output quantities y j (t ) are those produced by the...
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Notion of system