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


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1953
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
Entropy necessary for regulation
Output variety in
Variety necessary for regulation
Summary: Only variation can force variation down - exact conditions necessary. 4662, 4674, 4750
4658 4659

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1954
Requisite Variety, Law of re-stated
Variety requisite
Input saturation of
Summary: Law of Requisite Variety stated with respect to a rectangular table. Stated purely in terms of set theory 4850
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
Requisite Variety, Law of in set theory
Summary: McCallum and Smith also use the method of veto. 5583
5046 5047

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1955
Entropy zero entropy
Homeostasis as noise-correction
Noise homeostasis as anti-noise
Requisite Variety, Law of as noise-correction
Feedback and persistance
Quantum theory and Black Box
Summary: Law of Requisite Variety as law for suppression of noise.
5242 5243

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1957
Essential variables and trials
Immediate effect equals "cause"
Trial and error and essential variables
Summary: From essential variables to Grand Outcome, via trials. 5573, 5642
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
Requisite Variety, Law of in discriminative feedback
Summary: Solution in principle of the problem of discriminative feedback. 5590, 5594, 5601, 5608, 5631
5584 5585

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1960
Requisite Variety, Law of application to accumulation
Equivalence relation are arbitory
Pattern (in general) all are arbitrary
Perceptron
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
6166 6167
Requisite Variety, Law of in Pandemonium
Oddments [46]: Carry out the program of pages 6184 (foot) and 6185 (top).
Summary: Selfridge's Pandemonium and pattern recognition. 6222
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).
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".
6184 6185

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1961
Localisation principles of
Requisite Variety, Law of localisation of memory
Summary: For economy, the brain must store memories at the site of use. 6383
Confluant getting smaller confluants
Equilibrium getting neutral equilibrium
6362 6363

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