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%%
%% Ein Beispiel der DANTE-Edition
%% Mathematiksatz mit LaTeX
%% 3. Auflage
%% Beispiel 09-26-2 auf Seite 207.
%% Copyright (C) 2018 Herbert Voss
%%
%% 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.
%%
%% ====
% Show page(s) 1
%%
%%
\documentclass[10pt]{exaartplain}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{witharrows} \WithArrowsOptions{displaystyle,tikz=blue}
%StopShownPreambleCommands
\begin{document}
$\begin{WithArrows}
\sum_{i=1}^n (x_i+1)^2 &= \sum_{i=1}^n (x_i^2+2x_i+1) \Arrow{by linearity}\\
&= \sum_{i=1}^n x_i^2 + 2\sum_{i=1}^nx_i+ n
\end{WithArrows}$
\end{document}
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