A Venn diagram illustrating the intersection of two sets
The addition x + a on the number line. All numbers greater than x and less than x + a fall within that open interval.

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

- Set-builder notation

Thus, in set builder notation,

- Interval (mathematics)
A Venn diagram illustrating the intersection of two sets

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