%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-4-38 on page II-178 in "mattens --- Commands to typeset tensors".
%%
%% 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{135.0pt}
% Shorten the vertical size of the example ...
\AtBeginDocument{%
\setlength\abovedisplayskip{.8\abovedisplayskip}%
\setlength\belowdisplayskip{.8\belowdisplayskip}%
}
%StartShownPreambleCommands
\usepackage{mattens}
%StopShownPreambleCommands
\begin{document}
\begin{gather}
\aSb{x} \neq \aSb*{x} \neq \aSb[\hat]{x} \neq \bSa{X} \\
\bS{\delta} \neq \bS*{\delta} \neq \bS[\hat]{\delta} \\
\bCSb{a} \cdot \bS{c} = \bS{a} \times \bS{c}
\end{gather}
\end{document}
