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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-8-5 on page II-214 in "Letters, numerals, and other Ordinary symbols".
%%
%% 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{.5\abovedisplayskip}%
\setlength\belowdisplayskip{.5\belowdisplayskip}%
}
%StartShownPreambleCommands
\usepackage[fleqn]{amsmath} \usepackage{amssymb}
\DeclareMathSymbol\bneg {\mathbin}{symbols}{"3A}
\DeclareMathSymbol\rsquare{\mathrel}{AMSa}{"03}
\thickmuskip=10mu plus 5mu
%StopShownPreambleCommands
\begin{document}
\noindent Symbols of wrong class (ord):
\[ a \neg b \qquad x \square y + z \]
Manual correction:
\[ a \mathbin{\neg} b \qquad x \mathrel{\square} y + z \]
Symbols of correct class:
\[ a \bneg b \qquad x \rsquare y + z \]
\end{document}
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