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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  Mathematiksatz mit LaTeX
+%%  3. Auflage
+%%  Beispiel 09-09-3 auf Seite 180.
+%%  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]{screxa}
+\pagestyle{empty}
+\setlength\textwidth{122.40707pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+%StartShownPreambleCommands
+\usepackage{braket}
+%StopShownPreambleCommands
+\begin{document}
+\[ \Braket{ \phi | \frac{\partial^2}{\partial t^2} | \psi }\]
+\[ \Set{ {\phi} | \frac{\partial^2}{\partial t^2} | \psi }\]
+\end{document}