# Definition:Real Interval/Endpoints

## Definition

Let:

$\closedint a b$

or

$\hointr a b$

or

$\hointl a b$

or

$\openint a b$

be a real interval.

The numbers $a, b \in \R$ are known as the endpoints of the interval.

$a$ is sometimes called the left hand endpoint and $b$ the right hand endpoint of the interval.

## Also known as

The endpoints can also be written as end points.