# Difference between revisions of "Interval"

(→Examples) |
(→Examples) |
||

Line 22: | Line 22: | ||

− | Use latex \infty for infinity symbol. | + | Use latex \infty for infinity symbol and use latex \cup for OR symbol. |

## Latest revision as of 18:39, 15 September 2021

## Definition

An **interval** is a continuous range of values, such as all of the real numbers between and inclusive. The most common uses of an interval are to specify the domain and range of a function.

## Symbols

If an interval has either or in it, the values at the end are **NOT** included in the interval.

If an interval has either or in it, the values at the end **ARE** included.

If both endpoints are not included, then the interval is **open.** If both endpoints are included, then the interval is **closed.**

*Note*: The symbols and are used with and by convention.

## Examples

- means all real numbers between and but not including or

- means all real numbers between and including but not including

- means all real numbers greater than or equal to

Use latex \infty for infinity symbol and use latex \cup for OR symbol.