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{{ printedBook.courseTrack.name }} {{ printedBook.name }} An interval can be denoted in different ways. One way is the *interval notation,* using $[]$ and $().$

The interval above can be described with an inequality as
$-1≤x<2$
where $≤$ indicates that the endpoint is included and $<$ that it's not. The inequality can be translated to **interval notation** where $[$ indicates that the endpoint is included and $)$ that it's not.
$[-1,2)$
The interval can then be read as all numbers greater and equal to $-1$ and less than $2$.

For more examples see the table below.

Inequality | Interval Notation |
---|---|

$0<x<24$ | $(0,24)$ |

$0.1≤y≤2.7$ | $[0.1,2.7]$ |

$3≤x$ | $[3,∞)$ |

$z<899$ | $(-∞,899)$ |

Note that if the variable only has one limit, the other is infinity and is not included in the interval.