# \in

## Summary

The command \in is used for referencing using a number.

## Settings

 \in{...}{...}[...] {...} text {...} text [...] reference

## Description

Inserts a reference to a location in the document which has been marked with a label (e.g. an equation, figure, section, enumerated item). This works only with numbered items! The curly-brace arguments contain prefix and suffix, the square brackets contain the label of the point/object/section to which you are referring.

After the prefix an automatic space is inserted in the output. If this is problematic, for instance because you want parentheses around a referenced number, see \definereferenceformat. That command allows you to define your own in-like commands.

## Examples

### Example 1

\setuppapersize[A5]

\placeformula[eq:pythagoras]
\startformula
a^2+b^2=c^2
\stopformula

This is explained in \in{Equation}{.}[eq:pythagoras]