Digital Signal Processing Handbook Part 2

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Digital Signal Processing Handbook Part 2

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A function containing variables and their derivatives is called a differential expression, and an equation involving differential expressions is called a differential equation. A differential equation is an ordinary differential equation if it contains only one independent variable; it is a partial differential equation if it contains more than one independent variable. We shall deal here only with ordinary differential equations. In the mathematical texts, the independent variable is generally x, which can be anything such as time, distance, velocity, pressure, and so on. In most of the applications in control systems, the independent variable is time....

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