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. (Brian Campbell Vickery)

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.

Brian Campbell Vickery

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