Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems:
|author=Karl Johan Åström and Richard M.Murray|title=Feedback Systems: An Introduction for Scientists and Engineers}}
Self-regulating mechanisms have existed since antiquity, and the idea of... more
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