%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 04-08-8 auf Seite 57.
%%  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.
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\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{170.40707pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{30}
\renewcommand\theequation{4.\arabic{equation}}
%StartShownPreambleCommands
\newenvironment{mathspace}[1][3pt]{%
  \setlength{\jot}{#1}\ignorespaces\eqnarray
}{\endeqnarray\ignorespacesafterend}
%StopShownPreambleCommands
\begin{document}
\begin{mathspace}[0pt]
  y & = & d\\  y & = & c\,\frac{1}{x}+d\\
  y & = & b\,\frac{1}{x^{2}}+cx+d
\end{mathspace}
\end{document}
