%%
%% An UIT Edition example
%%
%% Example 04-08-8 on page 54.
%%
%% Copyright (C) 2010 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}
\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}
