I have an equation:


I would like to refer to this equation and show the whole formula again, and not only its number. In other words, I wanna get $f(x)=x$ instead of \eqref{eq:equation}.

How do I refer to the equation in order to reproduce its formula instead of its number?

  • Welcome to TeX.sx!
    – henrique
    Oct 8, 2012 at 14:43
  • A tip: indent with 4 spaces the code block to format it properly or use the button with the braces ({}) above the edit window. In the case of inline code, either put the code between backticks (`) or select and press Ctrl+K.
    – Count Zero
    Oct 8, 2012 at 14:45
  • 1
    The answer to the question at tex.stackexchange.com/questions/47570/… suggests a way to write a command that "remembers" text in one place to use in another. It might work for you if you don't need to do it often. For a systematic solution, you will have to wait for one of the regulars here to chip in. Oct 8, 2012 at 15:15

2 Answers 2


I just found this question that was asked earlier: Is it possible to re-insert a LaTeX equation by label?

It cites "Equation Reuse" from LaTeX-Community Forum as a solution.




%defining the box
%filling the box
  a &= b\\
  &= c\\
  &= d\\
  &= e\\
  &= f

%using the box

%using the box

%using the box


Hope this helps!

  • It works pretty well. I would like to turn off the numbering when I use equation or align instead of align*. For instance, the first time the equation apear, I want to number it. The next time it apears, I want turn off the number. Anyone have an idea?
    – Diogo
    Oct 8, 2012 at 22:31
  • You could have the first instance be in the equation environment and define a separate box with the equation in displaymath. It's not a great solution, unfortunately.
    – kanatzidis
    Oct 8, 2012 at 23:33

This might be a solution, but I don't see how it would help the reader.

  \@ifundefined{repeatable@#1}{NOT FOUND}{$\@nameuse{repeatable@#1}$}%



This is seen in \eqrepeat{eq:good}.


However it seems from your comments that you want something more complicated; please be more specific in your question.

enter image description here

  • Actually, I just want to repeat the function of equation. Your answer worked well. Do you know how to hide the number not in the main equation, but when I am referring to that in the text? Thanks.
    – Diogo
    Nov 27, 2013 at 5:09
  • 1
    @Diogo Use equation*. But I don't find particular merits in the practice of repeating the whole equation; to be honest I consider it heavy.
    – egreg
    Nov 27, 2013 at 7:25
  • In case anyone else comes across this: When \repeatable contains a tikzcd-environment, I had to add [ampersand replacement=\&] to tikzcd to avoid the error Undefined control sequence. \end{tikzcd}}. I'd love to know why!
    – Anna
    Apr 1 at 23:58
  • @egreg One reason I see for repeating equations is a "cheat sheet" at the end of an equation-heavy document.
    – Anna
    Apr 2 at 0:00
  • 1
    @Anna It’s because the material is read as the argument to another command.
    – egreg
    Apr 2 at 8:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.