## Hypertext Help with LaTeX

### Cross References

One reason for numbering things like figures and equations is to refer the reader to them, as in "See Figure 3 for more details."

### Sections, Equations, Tables, etc.

One can generate numbered references to anything for which LaTeX
maintains a counter by placing a
`\label` command
with some mnemonic name in the appropriate
environment. The reference is then generated
by use of the `\ref` command with the
same mnemonic.

For example

\begin{equation} \label{eqno1} c \geq \sqrt{a^2+b^2+1} \end{equation} .... intervening text ... From Eq.~(\ref{eqno1}) we see ...

Assuming that this is the first equation,
the last line will produce "From Eq. (1) we see ..." Note the
use of the `~`
to ensure that there is no line break between "Eq." and "(1)."
Also note that the `\ref` command produces only the number;
if you want the number to be in parentheses (as shown here) you have
to include them in your text.

### Bibliographic citations

Bibliographic citations work somewhat differently. The following should be consulted:

See also

Return to LaTeX Table of Contents

Revised 03 Nov 1995.