: Includes both endpoints. On a number line, this is shown with . Open Interval
: Excludes both endpoints. On a number line, these are marked with . Half-Open Interval : Includes one endpoint while excluding the other.
In mathematics, an interval is a set of real numbers that includes all numbers between two endpoints. Writing these requires specific brackets to indicate whether those endpoints are included in the set: Closed Interval
Used when a set continues forever in one or both directions, such as for all real numbers. 2. Music: Pitch Distance
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