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Collection Equivalence Relation Equivalence Class Mutually Disjoint

1	Equivalence Relation
1	Collection
1	Equivalence Class
3	Mutually Disjoint

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Partition

A partition of a set is a collection of pairwise disjoint nonempty sets such that $\cup P = S$ .

Any partition of a set introduces an equivalence relation on , where each $A \in P$ is an equivalence class. Similarly, given an equivalence relation on , the collection of distinct equivalence classes is a partition of .