View Interval Notation Set Builder Notation Examples Background. Using interval notation it looks like It can also be thought of as a segment of the real number line.

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X is a letter in the word dictionary}. It can also be thought of as a segment of the real number line. We can use interval notation to show that a value falls between two endpoints.

But what if we had a really big set—one with a large number of elements that all share a certain property?

The endpoints of the interval are the numbers. Explain why we do not use a bracket in interval notation when infinity is an endpoint. A set is a collection of unique elements. Interval notation is a notation for representing an interval as a pair of numbers.