Label and reference LaTeX equations in org-mode

Question

This is similar to Org export to latex and HTML references, but for equations.

I like to use LaTeX math snippets in my org-files, as in

* The Quadratic Equation
The roots of $ax^2 + bx + c$ are given by
\begin{equation}
\label{eq:1}
x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}
\end{equation}

According to Equation \ref{eq:1}, ...

When I export to LaTeX, the \ref{eq:1} correctly turns into a hyper link to the equation. But I want to achieve the following additional behavior:

1. Inside the org file, I can click the text \ref{eq:1} (the text doesn't have to be \ref{eq:1}, I just want a hyperlink) and be taken to to the equation. This functionality is present for headers, as in [[The Quadratic Equation]] becomes clickable in Org mode.

2. When I export to HTML, I want to the references to be kept (actually, the label (1) doesn't even show up in HTML export).

Is there a way to accomplish this?

Answer 1

I had to run some test, but I managed to run a small file that exports correctly to both latex and HTML, I tested only in org 8.2.10, but it should work on other versions.

The answer is actually the same as in Org export to latex and HTML references

Here I have a small example

*  This is a latex experiment
so with the text...
#+NAME: code:1
#+BEGIN_SRC shell-script
echo hello world 
#+END_SRC
[[code:1]] is a reference to src block

#+NAME: eqn:1
\begin{equation}
    f(x) =  \sum\limits_0^\infty(f^{(n)}(x)|_{x=0} \cdot x)
\end{equation}

And this is an equation [[eqn:1]]

Answer 2

Actually, it seems that Org mode 8.3.1 has built-in support for what the question is asking; label and ref work out of the box.

This requires one to update Org mode through the package manager; afterwards, stick (package-initialize) near the top of the initialization file.

EDIT. This does not allow you to click the \ref{...} and go to the label. For that, please see the accepted answer above, or use org-ref.

Answer 3

As is described in Internal links.

You can use <<id>> to set your target id and use [[id]] or [[id][description]](You can use C-c C-l to insert this) to find your target.

This works for me while exporting to HTML.