%%
%% The LaTeX Companion, 3ed
%%
%% Example 12-1-2 on page II-227 in "The world of (Latin) math alphabets".
%%
%% 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{207.0pt}

  \AddToHook{begindocument/end}{%      % save some space in the example
    \setlength\abovedisplayshortskip{4pt}%
    \setlength\belowdisplayskip{0pt}%
    \setlength\belowdisplayshortskip{0pt}}

%StartShownPreambleCommands
\usepackage[mathscr]{eucal}
%StopShownPreambleCommands

\begin{document}
\[ \mathcal{ABCDEFGHIJKLMNOPQRSTUVWXYZ} \]
\[ \mathscr{ABCDEFGHIJKLMNOPQRSTUVWXYZ} \]
\end{document}