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== Numbering Equations ==
Equation numbering is one of Math's best hidden features. The steps are simple, but obscure:

# Start a new line in the Writer document.
# Type fn and then press {{button|F3}}.

The ''fn'' is replaced by a numbered formula:

{| style="border-spacing:0;"
! <center>[[Image:AOO41GS09_20.png]]</center>
|-
|}

Now you can double-click on the formula to edit it. For example, here is the Riemann Zeta function:

{| style="border-spacing:0;"
! <center>[[Image:AOO41GS09_21.png]]</center>
|-
|}

You can reference an equation (“as shown in Equation (1)”) with these steps:

# Choose {{menu|Insert|Cross-reference}} from the menu bar.
# On the ''Cross-references'' tab (Figure 218), under ''Type'', select ''Text''.
# Under ''Selection'', select the equation number.
# Under ''Format'', select ''Reference''.
# Click {{button|Insert}}.

Done! If you later add more equations to the paper before the referenced equation, all the equations will automatically renumber and the cross-references will update.

{{Tip| To insert the equation number without parenthesis around it, choose Numbering instead of Reference under Format.}}

[[Image:AOO41GS09_019.png|400px|center]]
<center>''Figure 218. Inserting a cross-reference to an equation number ''</center>

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[[Category:Getting Started (Documentation)]]