Volume 25 of W. Ross Ashby's Journal
links, random page links, the jump-to-any-page, jump-to-any-volume boxes, and much
more. It will annoy you...
Summary: Interaction between two subsets of variables.
Summary: If two variables do not communicate, either directly or indirectly, then any interaction
Q that include them must go to zero. Steady state Morowitz' book Thermodynamics Morowitz' book
Summary: The informational qualities involved when the coordination achieves a permutation.
Cause cause analysis
Summary: The core of Shannon's thinking.
Summary: Notes on Information operators.
Summary: [ H, T, and Q] as operators that alter distributions.
Summary: Specifying an n-tuple in a distribution and on its components. 7170. Simpler example 7087
Summary: Coordination analysis.
Summary: The Case of the Two (and Only Two) Volunteers.
Summary: "Keeping together" demands very little in communication.
Summary: Minsky and Papert really get hold of the Perceptron. Coding problem
Summary: The Problem of Coding successfully stated.
Summary: The Coding Problem, even when asked only of binary relations, does not always admit
a solution giving equality. 7086
Summary: A channel must be coded into and coded out of. Channel what is a channel?
Summary: Keeping a shoal together.
Summary: Coding coordination between three variables on to two channels.
Design informational cost
Summary: "Design" as a transmission of information. 7108 example.
Information in pulse and gap
Summary: No-pulse may carry more information than pulse.
Summary: Informational identities when arguments are repeated, or equalised.
Summary: A worked out example of Conant's theorem on isomorphism in regulators. 7117
Games as noisy transmission Noise and games
Summary: Example of how much selection is required to make a system stable. Information required for stability Stability information needed
Summary: Numerical confirmation of the theorem relating input-constraint and design. 7115, 7123, 7127
Channel capacity Least Safe Least Safe Capacity
Summary: Examples of a channel that must have Least Safe Capacity, though transmitting less.
Epistemology : McCrea's "principle" ( 7113) "The less information we can get [about distant events] the less we need in order
to make predictions that are testable by observation.".
Summary: An idea, not yet developed.
Design informational cost
Summary: Conant's theorem on models applied to the Watt's governor.
Summary: The error-controlled regulator, and the doctor who is one patient behind in his treatments.
Summary: Interaction between parts having inputs raises the complexity by x k. i i = number of inputs to each part; k = number of values (states) of each part). Information and interaction Interaction increases information by x k i
Summary: Me and my brain in dreams. Dream and "self" Self-awareness impossible
Summary: Among systems all of full interaction, doubling the size of the systems multiplies
the information demands by the number of bits required initially.
HYFI (Hydraulic Feedack Imitator) design
Summary: All large systems will tend to be insensitive, in their behaviours, to changes in
Summary: Why does Man's brain weigh just 2½ pounds ? 7143
Interaction and vector-formation N-tuple effect on Q Vector effect on Q
Summary: Thinking variables into vectors does not raise the order of the highest non-zero interaction.
Summary: In some cases "bits per second" may be less meaningful than "highest order of non-zero
interaction". Indexed as far as Memory sentence with short memory Sentence with limited memory
Summary: Causal analysis traced back to natural (physico-chemical or other) laws as origin.
(This last note has decided me to write up my collected ideas as a book)
Summary: The identities in H, T, Q remain identities if the letters are changed to script.
Summary: A collected list of laws (of all types). 7174
Summary: The term expressing A's effect on the coding between B and C is the interaction [ Q] (not the previously suggested Y) [B:C] A
Summary: Elements specified by n-tuples. 7182
Summary: Information analysis and the analysis of variance.
Summary: Application of the idea of conservation of energy varies widely in its obviousness.
A collected list.
Summary: Where information analysis ("conservation of causation") might be used.
Summary: Forming a partition seems again to emerge as the fundamental operation.
Summary: Scientific study is just performing partitions.
These images are reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972,
2008 © The Estate of W. Ross Ashby