delimiters (overview)

Delimiters (parentheses, braces, brackets. ...)
Command	Example	Result
\left(... \right)	$$$2\left(a+b\right)$$$	$$2~\left(a+b\right)$$
\left[... \right]	$$$\left[a^2+b^2~\right]$$$	$$\left[a^2+b^2~\right]$$
\left{... \right}	$$$\left{x^2, x^3, x^4,... \right}$$$	$$\left{x^2, x^3, x^4,... \right}$$
\left\langle... \right\rangle	$$$\left\langle a,b~\right\rangle$$$	$$\left\langle a,b~\right\rangle$$
\left\| ... \right\|	$$$\det\left\|\array{a&b\\c&d}\right\| $$$	$$\det\left\|\array{a&b\\c&d}\right\| $$
\left\\| ... \right\\|	$$$\left\\|f~\right\\|$$$	$$\left\\|f~\right\\|$$
\left{ ... \right<strong>.</strong></p><p><font color="#ff0000"><em>(note the dot!)</em></font></p></td><td valign="top" width="33%"><p>$$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$$ (\rm switches to roman style)	$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$
\left.{ ... \right\} (note the dot!)	$$$\left.{{\rm~term1\atop\rm~term2}\right}=y$$$	$$\left.{{\rm~term1\atop \rm~term2}\right}=y$$

Note: The delimiters are automatically sizes.