**Definition**: Disjoint Sets

Two sets are called **disjoint** if their intersection is empty. The Venn diagram below illustrates two disjoint sets $A$ and $B:$

### Examples

- The set of all mammals and the set of all reptiles are disjoint.
- The set of all stars and the set of all planets are not disjoint.

| | | | | Contributors: *bookofproofs* | References: [979], [7838]

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[7838] **Kohar, Richard**: “Basic Discrete Mathematics, Logic, Set Theory & Probability”, World Scientific, 2016

[979] **Reinhardt F., Soeder H.**: “dtv-Atlas zur Mathematik”, Deutsche Taschenbuch Verlag, 1994, 10

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