The Good Regulator Theorem is a theorem by Roger Conant and W. Ross Ashby which supposedly proves that "every good regulator of a system must be a model of that system". In fact, there are some problems with that informal characterization.

The Good Regulator Theorem is a theorem by Roger Conant and W. Ross Ashby which supposedly proves that "every good regulator of a system must be a model of that system". In fact, there are some problems with that informal characterization.