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12 lines
650 B
Markdown
12 lines
650 B
Markdown
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title: interval
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---
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An [interval](https://en.wikipedia.org/wiki/Interval_(mathematics)) is a range of numbers between two endpoints: closed, open, or half-open.
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- A _closed_ interval, denoted by brackets, includes its endpoints. For example, [0, 1] is the interval where `0 <= x <= 1`.
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- An _open_ interval, denoted by parentheses, excludes its endpoints. For example, (0, 1) is the interval where `0 < x < 1`.
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- A _half-open_ interval includes only one of its endpoints. For example, (0, 1] is the _left-open_ interval where `0 < x <= 1`, while [0, 1) is the _right-open_ interval where `0 <= x < 1`.
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