Interval

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Definition

An interval is a range of values. The most common uses of an interval are for domain and range.

Symbols

If an interval has either ( or ) on it, the values at the end are NOT included.

If an interval has either [ or ] on it, the values at the end ARE included.

Note: $-\infty$ and $\infty$ are never included as endpoints

Examples

  • (2,3) means all real values between 2 and 3, but not including 2 and 3
  • [-2,0) means all real values between -2 and 0, but does not include 0
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