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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example A-1-5 on page 845.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%%    Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{183.0pt}
+\StartShownPreambleCommands
+\newcommand\lvec[2][n]
+ {\ensuremath{#2_1+\cdots + #2_{#1}}}
+\StopShownPreambleCommands
+\begin{document}
+For the series \lvec{x}  we have
+\[ \lvec{x} = \sum_{k=1}^{n} G_{\lvec[k]{y}} \]
+\end{document}