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===Parameter dependent systems===
In [[control engineering]], a [[state space]] representation is a [[mathematical model]] of a physical system as a set of input, <math>u</math> output, <math>y</math> and [[State variable|state]] variables, <math>x</math> related by first-order [[Differential equation|differential]] equations. The dynamic evolution of a [[nonlinear]], non-[[autonomous]] system is represented by
::<math>\dot{x} = f(x,u,t)</math>
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