% Fichier ex4.8.4-5.tex - Ch. Rolland/O Reilly France
\documentclass{article}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\begin{document}
$\Acute{\Acute{A}}\acute{\acute{A}}$

$\Hat{\Hat{B}}\hat{\hat{B}}$

$\Bar{\Bar{z}}\bar{\bar{z}}$
\end{document}
