1. ## Interval symbols explanation

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

2. Originally Posted by OReilly
Can someone explain me what does this symbols for intervals means:
$\displaystyle \begin{array}{l} \left( {1,5} \right) \\ \left[ {1,5} \right) \\ \left( {1,5} \right] \\ \left[ {1,5} \right] \\ \end{array}$
$\displaystyle \left( {1,5} \right) \\ \rightarrow 1<x<5$
$\displaystyle \left[ {1,5} \right) \\ \rightarrow 1 \le x<5$
$\displaystyle \left( {1,5} \right] \\ \rightarrow 1<x \le 5$
$\displaystyle \left[ {1,5} \right] \\ \rightarrow 1 \le x \le 5$

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

-Dan