Org-ref provides a ref link for exactly this purpose. It looks like
ref:an-equation and if you click on it it jumps to the label. The link is
red if the label doesn't exist and maroonish if it does. It exports in
latex as \ref{an-equation}. It sounds like just what you need.

You can get org-ref on melpa.

On Fri, Jun 28, 2019 at 9:15 AM Fraga, Eric <e.fraga@ucl.ac.uk> wrote:

> Hello all,
>
> it's that time of year where I have to think about revamping my lecture
> slides (having just finished one year, the next one starts...).  I write
> these in org and export to beamer obviously!
>
> I teach a technical subject.  I therefore have quite a few equations in
> my slides and I use LaTeX for these.  I would like to be able to use org
> fully with respect to links and targets.  If I define a label in LaTeX
> directly, \label{an-equation} for instance, I get no benefit from using
> an org link to it, e.g. [[an-equation]] (by default, this leads to the
> org exporter complaining about a missing target and if I tell org not to
> complain I subsequently miss real errors).  So I use inline LaTeX to
> provide the link, as in \ref{an-equation}.  But then I lose the ability
> to jump to the target within org, something which is quite useful given
> that I have many slides for the full module I teach.
>
> The only satisfactory solution I have found is to do something along
> these lines:
>
> #+begin_src org
>   The equation is:
>   ,#+begin_equation
>   <<an-equation>>
>   y = x + 3
>   ,#+end_equation
>
>   (later) In equation [[an-equation]], we see nothing much.
> #+end_src
>
> This works in that I can jump to the label by clicking on the link but I
> lose the ability to edit the equation in LaTeX mode.
>
> Any pointers would be welcome.
>
> Thanks,
> eric
>
> --
> Eric S Fraga via Emacs 27.0.50, Org release_9.2.4-379-g1b74ae
>
-- 
John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu