Hi
Is there an easy way to "re-use" an entire equation environment that is defined elsewhere in the tex source?
To clarify what I mean. Suppose that I have already defined coded up an equation as
Code: Select all
\begin{equation}
bla bla bla
\label{eq}
\end{equation}
and later (or at an earlier point) want to show the equation again (for one thing the equation might be derived in a supplementary appendix) using the same equation numbering. Now I could of course simply copy and paste the code snippet, but then I would get two reference numbers for the same equation which is what I'm trying to avoid. Hence any suggestions would be appreciated.
For now I have solved this by defining a new enviroment
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\newcounter{neqn}
\newenvironment{numeqn}[1][?]
{\setcounter{neqn}{\value{equation}}\renewcommand{\theequation}{#1}\begin{equation}}
{\end{equation}\setcounter{equation}{\value{neqn}}}
which allows me to set the same equation number as
Code: Select all
\begin{numeqn}[\ref{eq}]
bla bla bla
\end{numeqn}
however I still have to copy and paste the piece of tex source that sets the equation itself, thus if I later realize that the formula is erroneous, there is a good chance that I only remember to edit the formula in one of the places where it occurs.
regards Paitor
