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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 [[Computation | compute] some function. The GPAC can be implemented in practice through the use of mechanical devices or analog electronics. IAlthough analog computers have fallen almost into oblivition due to emergence of the digital computer, it is known that the GPAC models a wide range of dynamical systems

It is also known to correspond to a large class

These units perform the following basic operations: addition, product, and integration. Moreover there are also units which have as output some predetermined constant. Other operations like difference, quotient, composition, and differentiation can be implemented using only the previous

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