Latex and equation numbering

[frying_pan_cat]

Is there a way to tie equation numbers to a particular point in the text in latex, for example if I have equation number (2) and I refer to it in the text but subsequently decide that I need another numbered equation before that, therefore making the old equation number (3), is there a way to get the text to auto update the numbering where I previously refered to equation (2)?

I have had a quick google but found nothing.

I hope what I've said makes sense.

Thanks

 

[Inquisitor]

Yep:

\begin{equation}
\label{einstein}
E = \gamma mc^2
\end{equation}

Here's a reference: \eqref{einstein}.

See page 50 of the manual. Beware that you may have to run the compilation process twice or more to get it to pick up changes in references, though.

 

[frying_pan_cat]

Thanks, thats exactly what I was after