Set of rules to apply in a sorting or that determines an order in objects.

In general, we distinguish sorting from classification based on the fact that classification is a set of rules that define the sorting.
The classification defines a set of rules applicable to the set of objects to classify.


  • Classification of books in a library.
  • Classification of geometric figures based on various properties (e.g. the family of quadrilaterals)
  • Classifications of numbers: whole, integer, decimal, rational, real, algebraic, etc.

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