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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-5-8 on page II-184 in "Further horizontal extensions".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
\usepackage{lmodern}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{align*}
\overrightarrow {\psi_\delta(t) E_t h}
&\approx \overleftarrow {\psi_\Delta(t) E_t h}
& & \text{No style change} \\[-3pt]
& & & \text{without \textsf{amsmath}} \\
\underrightarrow {\psi_\delta(t) E_t h}
&\simeq \underleftarrow {\psi_\Delta(t) E_t h}
& & \text{Needs \textsf{amsmath}} \\
\overleftrightarrow {\psi_\delta(t) E_t h}
&\sim \underleftrightarrow{\psi_\Delta(t) E_t h}
& & \text{Needs \textsf{amsmath}}
\end{align*}
\end{document}
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