Chapter 0. From the Ground Up!
In theory there is no difference between theory and practice. In practice there is.
Lawrence “Yogi” Berra, 1925 New York Yankees baseball player
This chapter provides an overview of the material in the book and highlights the mathematical background needed to understand the analysis of signals and systems. We consider a signal a function of time (or space if it is an image, or of time and space if it is a video signal), just like the voltages or currents encountered in circuits. A system is any device described by a mathematical model, just like the differential equations obtained for a circuit composed of resistors, capacitors, and inductors.
By means of practical applications, we illustrate in this chapter the importance ...

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