Interval symbols explanation

Quote:

Originally Posted by OReilly

Can someone explain me what does this symbols for intervals means:
$\begin{array}{l} \left( {1,5} \right) \\ \left[ {1,5} \right) \\ \left( {1,5} \right] \\ \left[ {1,5} \right] \\ \end{array} $

$\left( {1,5} \right) \\ \rightarrow 1<x<5$
$\left[ {1,5} \right) \\ \rightarrow 1 \le x<5$
$\left( {1,5} \right] \\ \rightarrow 1<x \le 5$
$\left[ {1,5} \right] \\ \rightarrow 1 \le x \le 5$

Roughly speaking "(" or ")" means "does not include" and "[" or "]" means "includes."

-Dan