%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 10-9-1 on page 228.
%% 
%%  Copyright (C) 2009 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.
%% 

\documentclass[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{355.65944pt}
\usepackage[utf8]{inputenc}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{18}
\renewcommand\theequation{10.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{amsmath,array}
\AtBeginDocument{\setlength\tabcolsep{0pt}\renewcommand\arraystretch{0}
\setlength\abovedisplayskip{0pt}\setlength\abovedisplayshortskip{0pt}
\setlength\belowdisplayskip{0pt}\setlength\belowdisplayshortskip{0pt}}
\newcommand*{\diff}{\mathop{}\!\mathrm{d}}
\StopShownPreambleCommands
\begin{document}
\begin{tabular}{@{}*{2}{m{0.5\linewidth}}@{}}
\begin{align}\oint E\diff s=0 \end{align} & \begin{align}\nabla\cdot B=0\end{align}\\[-5pt]
\begin{align} a =\frac{c}{d} \end{align}  & \begin{align} b = 1 \end{align}        \\[-5pt]
\begin{align} c =1 \end{align} & \begin{align} \int 2x\diff x = x^2+C \end{align}
\end{tabular}
\end{document}
