• Syntax: \left{...\right.  <em><font color="#ff0000">(note the dot at the end!)</font></em></li><li><font color="#000000"><u>Ex.:</u> $$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$$ gives

$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$

(\rm~something switches to roman style)