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Hi,

Here's something I don't understand:
I use \newenvironment to define an environment which
makes subequations numbers, like in < 1.2a--1.3b >.
It is similar to the thing defined in subeqn.sty,
however I tried to make it based on LaTeX's way of
defining things.
The thing is that right behind closing the equations with
\end{subequations}, ther is a little extra space inserted, so
the next line f text is not flush the left margin.
This space is typically about 3pt.
Try the attached example.
Applying % behind the \end{subequations} solves the problem.
I just want to (try to) understand what is happening.

Anybody any idea?

Thanks,
--Eric

-BEGIN EXAMPLE--------------------------------------------------------
\documentstyle{article}

\newfont{\Bbb}{msbm10}
\newcommand{\RR}{\mbox{\Bbb R}}

%subequations environment
\newcounter{saveequation}
\newenvironment{subequations}{
  \refstepcounter{equation}
  \setcounter{saveequation}{\value{equation}}
  \setcounter{equation}{0}
  \renewcommand{\theequation}{
    \thesection.\thesaveequation\alph{equation}
  }
}{
  \setcounter{equation}{\value{saveequation}}%
}


\begin{document}

\section{Watch this}
Here is an example of the thing that goes wrong.
Notice the following formula sequence:
\begin{subequations}
\begin{eqnarray}
  && Ax = b,\\
  && x\in \RR^n
\end{eqnarray}
\end{subequations}
This is it!
Notice the small space ($\approx 3\mbox{pt}$, not constant witin a file).

\end{document}
-END EXAMPLE----------------------------------------------------------