%% %% Ein Beispiel der DANTE-Edition %% Mathematiksatz mit LaTeX %% 3. Auflage %% Beispiel 09-18-1 auf Seite 192. %% 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{170.40707pt} \AtBeginDocument{\setlength\parindent{0pt}} %StartShownPreambleCommands \usepackage{amsmath} \usepackage[customcolors,shade,markings]{hf-tikz} \usetikzlibrary{calc} %StopShownPreambleCommands \begin{document} \begin{equation*} \left.\begin{array}{rl} -2\cdot \tikzmarkin[mark at=0.93]{col 1} (0.05,-0.2)(-0.05,0.4)2&= -4 \\ -2\cdot 1&= -2 \\ -2\cdot 0\tikzmarkend{col 1} &= 0 \end{array}\right\} \text{\small \shortstack{Product increases\\ by 2 each time.}} \end{equation*} \begin{tikzpicture}[remember picture,overlay] \coordinate (col-aa) at ($(col 1)+(1.3,-1.8)$); \node[align=left,right] at (col-aa) {\small{Annotation}}; \path[-stealth,red,draw,use marker id] (col-aa) -| (0,0); \end{tikzpicture} \end{document}