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Digital electronics uses circuitry that has two possible states for inputs and outputs. You might call them On and Off, 0 and 1, or maybe True and False. The mathematics of logic, known as Boolean algebra, is based on the latter and is useful for digital circuit analysis, at least as a starting point. In this chapter, this logic-based understanding of digital circuits is introduced followed by the introduction of flip-flops, a first example in sequential logic, where the output depends on the inputs and the previous state of the system.