“The basic rules of classification are
- Each characteristic of division must produce at least two classes
- Only one principle of division must be used at a time, to produce mutually exclusive classes.
- The species of any genius must be completely exhaustive of their parent class.”

Source: Classification and indexing in science (1958), Chapter 1: The need for classification, p. 2.

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Brian Campbell Vickery 84
British information theorist 1918–2009

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