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A mathematical model of a system based on the use of a linear operator.

Block diagram illustrating the additivity property for a deterministic continuous-time SISO system. The system satisfies the additivity property or is additive if and only if ${\displaystyle y_{3}(t)=y_{1}(t)+y_{2}(t)}$ for all time ${\displaystyle t}$ and for all inputs ${\displaystyle x_{1}(t)}$ and ${\displaystyle x_{2}(t)}$. Click image to expand it.