# 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 by Sheldon Green, agxsg@giss.nasa.gov, 03 Nov 1995.