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equivalence class

noun, Mathematics
the set of elements associated by an equivalence relation with a given element of a set.
Origin of equivalence class
1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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equivalence class in Technology

An equivalence class is a subset whose elements are related to each other by an equivalence relation. The equivalence classes of a set under some relation form a partition of that set (i.e. any two are either equal or disjoint and every element of the set is in some class).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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