%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-5-19 on page II-191 in "Vertical extensions".
%%
%% 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{219.0pt}

%StartShownPreambleCommands

%StopShownPreambleCommands

\begin{document}
 \[
  \sqrtsign{1 + \sqrtsign{2 +
   \sqrtsign{3 + \sqrtsign{4 +
    \sqrtsign{5 + \sqrtsign{6 +
     \sqrtsign{7 + \sqrtsign{8 + x}}}}}}}}
 \]
\end{document}