%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-2-38 on page II-152 in "Fine-tuning tag placement".
%%
%% 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{279.0pt}
% Shorten the vertical size of the example ...
\AtBeginDocument{%
\setlength\abovedisplayskip{.2\abovedisplayskip}%
\setlength\belowdisplayskip{.7\belowdisplayskip}%
}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{equation} \begin{split}
\lvert I_2 \rvert &= \left\lvert \int_{0}^T \psi(t)
\left\{ u(a, t) - \int_{\gamma(t)}^a \frac{d\theta}{k}
(\theta, t) \int_{a}^\theta c (\xi) u_t (\xi, t) \,d\xi
\right\} dt \right\rvert \\
&\le C_6 \Biggl\lvert
\left\lvert f \int_\Omega \left\lvert
\widetilde{S}^{-1,0}_{a,-} W_2(\Omega, \Gamma_l)
\right\rvert \ \right\rvert
\left\lvert \lvert u \rvert
\overset{\circ}{\to} W_2^{\widetilde{A}} (\Omega; \Gamma_r,T)
\right\rvert \Biggr\rvert
\end{split} \raisetag{21pt} \end{equation}
A line of text after the equation \ldots
\end{document}
