%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-3-3 on page II-155 in "amsmath, mathtools --- The matrix environments".
%%
%% 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{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}

%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands

\begin{document}
To show the effect of the matrix on surrounding
lines inside a paragraph, we put it here
$\left(\begin{smallmatrix}
          -1 & 0 \\ 0 & -1 \end{smallmatrix}\right)$
and follow it with some more text on the next line.
\end{document}