Dissecting Conant and Ashby's Good Regulator Theorem

This post provides a clear and accessible explanation of Conant and Ashby's 1970 Good Regulator Theorem, which states that every good regulator of a system must be a model of that system. The author addresses the theorem's background and controversies, then uses Bayesian networks and intuitive language to explain the mathematical proof. Real-world examples illustrate the concepts, clarifying misconceptions around the term 'model'.