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This question already has an answer here:

$$

\begin{align}

a = b

\label{my equation}

\end{align}

$$

Equation \ref{my equation} is my equation.

I plan on editing my question Alternative representation of the covariant derivative? to make it more compact and concise, but it would be nice to save time and not have to renumber all of the equations manually a third time.

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marked as duplicate by dmckee Mar 3 '14 at 16:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ As linked, there isn't the ability to do it automatically, you have to use \tag{} (MathJax doesn't process it). Curiously, however, using $\ref{ref1}$ in the body does produce a (dead) hyperlink. $\endgroup$ – Kyle Kanos Mar 3 '14 at 14:57
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    $\begingroup$ It's worth noting that you don't need to tag every equation in your posts - just the ones that you refer to later on. If you have a quick browse you'll see that very few posts use them at all. You certainly don't need to tag substages of a calculation. Tagging is also a form of emphasis, but emphasis is lost if you use it on a lot of text, so it should be used only on the bits that really matter. See? $\endgroup$ – Emilio Pisanty Mar 3 '14 at 17:04
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\tag{something to refer back to}

$$ C^2 = A^2 + B^2 \,. \tag{PT} $$

And then later you write

Referring back to (PT) we see that side the length of the hypotenuse is clearly 13.


You have to type the refernces yourself. I tend to use *, **, $\dag$ and $\ddag$, or (as above) mnemonics for Physics SE posts.

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