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General purpose analog computer

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The General Purpose Analog Computer (GPAC)

The General Purpose Analog Computer (GPAC) is a mathematical model of analog computers first introduced in 1941 by Claude Shannon. This model consists of circuits where several basic units are interconnected in order to compute some function. These units perform the following basic operations: addition, product, integration. Moreover there are also units which have as output some predetermined constant. It can be shown that functions generated by GPACs are closed under quotients, difference