A state variable is one of the set of variables that are used to describe the mathematical "state" of a dynamical system. Intuitively, the state of a system describes enough about the system to determine its future behaviour. Models that consist of coupled first-order differential equations are said to be in state-variable form.
Read more about State Variable: Examples, Control Systems Engineering, See Also
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... this means the output full bond can be ignored and the diagram is simplified (though the variables have now been renumbered) R ---
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