The Law of Requisite Variety is a mathematical theorem relating the number of control states of a system to the number of variations in control that is necessary for effective response. The Law of Requisite Variety does not consider the components of a system and how they must act together to respond effectively. Here we consider the additional requirement of scale of response and the effect of...

We evaluate the Geiss-Leclerc-Schröer φ-map for shape modules over the preprojective algebra Λ of type c A1 in terms of matrix minors arising from the block-Toeplitz representation of the loop group SL2(L). Conjecturally these minors are among the cluster variables for coordinate rings of unipotent cells within SL2(L). In so doing we compute the Euler characteristic of any generalized flag vari...

I. Historical Development of Cybernetics.......................................................1 A. Origins.....................................................................................1 B. Second Order Cybernetics............................................................2 C. Cybernetics Today.....................................................................4 II. Relational Concepts...

Self-organisation is a fact in the world we live in. This is a relational world in which agents’ natural asymmetrical complexities are warped by the Law of Requisite Variety. For as long as these relations remain requisite variety will assert itself mostly through self-regulation and self-organisation. This was the intended theme of the Sixteen Congress of the World Organisation of Systems and ...

Self-organisation is a fact in the world we live in. This is a relational world in which agents’ natural asymmetrical complexities are warped by the Law of Requisite Variety. For as long as these relations remain requisite variety will assert itself mostly through self-regulation and self-organisation. This was the intended theme of the Sixteen Congress of the World Organisation of Systems and ...

SINCE the outbreak of war we have had much valuable instruction and advice on the exercise of economy and the avoidance of extravagance and waste. It is our duty to apply this teaching in our professional as well as in our privat.e life, and to practise the strictest economy in the use of dressings and in prescribing medicines. This does not mean that a drug which is considered necessary in tre...

A new cyanosulfur-ylide based linker makes possible the synthesis of C-terminal peptide alpha-ketoacids by solid phase synthesis. The preparation of the requisite linker and its application to a variety of C-terminal peptide alpha-ketoacids with unprotected side chains is reported.

If A is a variable of any kind, the entropy H(A) is a measure of its vanety. It shows how much the various appearances of A differ from each other, whatever be the kind and nature of these appearances. For a quantifiable variable, entropy is just another measure of variance. But entropy can be used, as a measure of variety, for qualitative variables as well. If A and B are two variables, the de...

Sudden cardiac death is a devastating and tragic event, especially in young, fit and healthy individuals with no prior symptoms or medical conditions. In these cases, death is caused mainly by a variety of inherited cardiac disorders, either with structural abnormalities or purely electrical heart diseases. Although in most cases conventional autopsy is able to establish the cause of death, the...