Character Modifiers

\hat{e}	$\hat{e}$	\widehat{easy}	$\widehat{easy}$
\tilde{e}	$\tilde{e}$	\widetilde{easy}	$\widetilde{easy}$
\check{e}	$\check{e}$	\breve{e}	$\breve{e}$
\acute{e}	$\acute{e}$	\grave{e}	$\grave{e}$
\bar{e}	$\bar{e}$	\vec{e}	$\vec{e}$
\dot{e}	$\dot{e}$	\ddot{e}	$\ddot{e}$
\not e	$\not e$

Note that the wide versions of hat and tilde cannot produce very wide alternatives. The `\not' operator hasn't properly cut the following letter. The Fine Tuning section on page describes how to adjust this.

If you want to place one character above another, you can use \stackrel, which prints its first argument in small type immediately above the second

$ a \stackrel{def}{=} b + c $

gives $a \stackrel{def}{=} b + c$

See the Macros section for how to stack characters using atop.