How to link an equation in LaTeX

Question

I am wondering how I can link an equation in LaTeX, I mean when I click on the link then I'll be directed to that specific equation.

Answer 1

You can use the standard \label{key}, \ref{key} (or, if amsmath has been loaded, \eqref{key} to automatically include the parenthesis in the reference) mechanism; \label assigns a "key" (a string of characters and/or digits and/or punctuation) to the element (a sectioning command, one of the environments equation, figure, table, the theorem-like structures, etc.); \ref typesets the "number" associated to the key. There's also \pageref{key} to typeset the number of the page where the \label command was used.

The hyperref package will automatically generate customizable hyperlinks in your document.

A little example:

\documentclass{article}
\usepackage{amsmath}
\usepackage{hyperref}

\begin{document}

\begin{equation}\label{eq:test}
  a=b
\end{equation}
\eqref{eq:test}

\end{document}

You'll have to compile twice to generate the cross-references.

Answer 2

you need to use an environment -- like equation or many of the environments in amsmath -- that can be numbered and take a \label. then using the hyperref package and \ref{label-value} (or, better, amsmath's \eqref) there will be hyperlinks in your pdf output.