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An endpoint is a point at one end of a segment or the starting point of a ray. It represents the limit or boundary of a function on a given interval.
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Interval: A set of numbers between two endpoints. Intervals can be open, closed, or half-open, indicating whether their endpoints are included.
The set of all possible input values (x-values) for which a function is defined, often determined by its endpoints.
A measure that describes how one quantity changes in relation to another; often calculated over an interval with specific endpoints.