<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-2-14 on page II-139 in "Multiple alignments: \protect \nxLenv  {align} and \protect \nxLenv  {flalign}".
%%
%% 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{231.0pt}

%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands

\begin{document}
This example has two column-pairs.
\begin{flalign}  \text{Compare }
  x^2 + y^2 &amp;= 1               &amp;
  x^3 + y^3 &amp;= 1               \\
  x         &amp;= \sqrt   {1-y^2} &amp;
  x         &amp;= \sqrt[3]{1-y^3}
\end{flalign}
This example has three column-pairs.
\begin{flalign}
    x    &amp;= y      &amp; X  &amp;= Y  &amp;
      a  &amp;= b+c               \\
    x'   &amp;= y'     &amp; X' &amp;= Y' &amp;
      a' &amp;= b                 \\
  x + x' &amp;= y + y'            &amp;
  X + X' &amp;= Y + Y' &amp; a'b &amp;= c'b
\end{flalign}
\end{document}
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