Welcome to the UK List of
TeX Frequently Asked Questions
on the Web


The index of Frequently Asked Questions about TeX is searchable.

Please enter your keyword here:   then press here: ,    or:

Re-using an equation

To repeat an existing equation, one wants not only to have the same mathematics in it, one also wants to re-use the original label it had. The amsmath package comes to our help, here:

Remember that

Here, the second instance of a=b will be typeset with a copy, made by the \tag command, of the label of the first instance.

Distributed as part of AMSLaTeX macros/latex/required/amslatex (or browse the directory); catalogue entry

Go to previous question, or next question

Go to FAQ home.

URL for this question: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=reuseq

Comments, suggestions, or error reports? - see “how to improve the FAQ”.

This is FAQ version 3.27, released on 2013-06-07.