# 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:

- `\cite`
- `\thebibligraphy`

See also

- `\label`
- `\ref`
- `\pageref`

- `\cite`
- `\thebibligraphy`

- Counters
- Environments
- Sectioning

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