A Venn diagram illustrating the intersection of two sets
Color-coding hot- and cold-water faucets (taps) is common in many cultures but, as this example shows, the coding may be rendered meaningless because of context. The two faucets (taps) probably were sold as a coded set, but the code is unusable (and ignored), as there is a single water supply.

Mathematical notation for describing a set by enumerating its elements, or stating the properties that its members must satisfy.

- Set-builder notation

Set-builder notation, a formal notation for defining sets in set theory

- Notation
A Venn diagram illustrating the intersection of two sets

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