Ross indexed the following pages under the keyword: "Requisite Variety, Law of".

Requisite Variety, Law of proof by inverse Summary: Regulation (destruction of information) requires extra information. Continuous form 4395, 4658 4386 4387

Homeostasis variety is necessary Regulation variety is necessary Requisite Variety, Law of stated Summary: Only variation can force variation down - exact conditions necessary. 4662, 4674, 4750 Entropy necessary for regulation Output variety in Variety necessary for regulation 4658 4659

Requisite Variety, Law of re-stated Variety requisite Summary: Law of Requisite Variety stated with respect to a rectangular table. Stated purely in terms of set theory 4850 Input saturation of 4846 4847

Requisite Variety, Law of in set theory Summary: The Law of Requisite Variety in full rigours of set theory. 5002, 5047 4850 4851

Hunt and stick in logic machine Logic machine Strategy of trial and error Veto in equilibria Veto use by McCallum Summary: McCallum and Smith also use the method of veto. 5583 Requisite Variety, Law of in set theory 5046 5047

Entropy zero entropy Homeostasis as noise-correction Noise homeostasis as anti-noise Requisite Variety, Law of as noise-correction Summary: Law of Requisite Variety as law for suppression of noise. Feedback and persistance Quantum theory and Black Box 5242 5243

Summary: From essential variables to Grand Outcome, via trials. 5573, 5642 Essential variables and trials Immediate effect equals "cause" Trial and error and essential variables Cause and feedback Discrimination requires information Feedback discriminative needs information Immediate effect and feedback Requisite Variety, Law of in discriminative feedback Supplementation in discriminatative feedback 5538 5539

Summary: Solution in principle of the problem of discriminative feedback. 5590, 5594, 5601, 5608, 5631 Requisite Variety, Law of in discriminative feedback 5584 5585

Requisite Variety, Law of application to accumulation Summary: When there is no information about the problems that recur, accumulation demands that the activations are small and that the "chance" method be used. 6227 Equivalence relation are arbitory Pattern (in general) all are arbitrary Perceptron 6166 6167

Summary: Selfridge's Pandemonium and pattern recognition. 6222 Requisite Variety, Law of in Pandemonium Oddments [46]: Carry out the program of pages 6184 (foot) and 6185 (top). Summary: I should re-read my Notes, Vol. 5 or so onwards, reading "lots of step-functions" as the more general "lots of equilibria", and lots of step-surfaces" as "lots of boundaries of confluents". Confluant generalisation of step-function Step function what matters is the confluent Oddments [46]: Carry out the program of pages 6184 (foot) and 6185 (top). 6184 6185

Summary: For economy, the brain must store memories at the site of use. 6383 Localisation principles of Requisite Variety, Law of localisation of memory Confluant getting smaller confluants Equilibrium getting neutral equilibrium 6362 6363