What are interval numbers?

Interval numbers refer to the set of numbers that lie between two specific values, effectively forming a continuous range. This concept is often employed in mathematics to define a segment of the number line characterized by a lower boundary and an upper boundary. For example, the interval between 2 and 5 would include all numbers from 2 to 5, such as 2.1, 3, 4.999, and so forth.

Interval notation is commonly used to describe this range concisely, for instance, [2, 5] indicates that both endpoints are included in the interval, whereas (2, 5) signifies that the endpoints are not part of the interval. Understanding interval numbers is crucial as they help in various mathematical applications, including solving inequalities and determining the domains of functions.

The other definitions provided, while related to specific types of numbers or mathematical operations, do not capture the essence of interval numbers, which fundamentally pertain to the concept of a continuous range between two defined limits.