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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-4-4 on page II-164 in "Fractions and their generalizations".
%%
%% 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{153.0pt}

  % Shorten the vertical size of the example ...
  \AtBeginDocument{%
    \setlength\abovedisplayskip{.4\abovedisplayskip}%
    \setlength\belowdisplayskip{.4\belowdisplayskip}%
  }

%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands

\begin{document}
\begin{equation} \frac{1}{k} \log_2 c(f) \quad
                 \tfrac{1}{k} \log_2 c(f)
\end{equation}
Text: $ \sqrt{ \frac{1}{k} \log_2 c(f) } \quad
        \sqrt{ \dfrac{1}{k} \log_2 c(f) }\, $.
\end{document}