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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-5-3 on page 497.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%% Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{183.0pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+\widehat {\psi_\delta(t) E_t h}
+&= \widetilde {\psi_\delta(t) E_t h} \\
+\overline {\psi_\delta(t) E_t h}
+&= \underline {\psi_\delta(t) E_t h} \\
+\overbrace {\psi_\delta(t) E_t h}
+&= \underbrace {\psi_\delta(t) E_t h}
+& & \text{Do not change style} \\
+\overrightarrow {\psi_\delta(t) E_t h}
+&= \overleftarrow {\psi_\delta(t) E_t h}
+& & \text{Do not change style} \\[-3pt]
+& & & \text{without \textsf{amsmath}} \\
+\underrightarrow {\psi_\delta(t) E_t h}
+&= \underleftarrow {\psi_\delta(t) E_t h}
+& & \text{Do need \textsf{amsmath}} \\
+\overleftrightarrow {\psi_\delta(t) E_t h}
+&=\underleftrightarrow{\psi_\delta(t) E_t h}
+& & \text{Do need \textsf{amsmath}}
+\end{align*}
+\end{document}