# Sectioning

Sectioning commands provide the means to structure your text into units. The document style determines which sectioning commands are supported. They should be used with the following heirarchy:

• \part
• \chapter (report style only)
• \section
• \subsection
• \subsubsection
• \paragraph
• \subparagraph
• \subsubparagraph (milstd and book-form styles only)
• \subsubsubparagraph (milstd and book-form styles only)

The counter for each level is reset when the level above is incremented (except chapters are numbered sequentially regardless of the part).

All sectioning commands take the same general form:

  \chapter[optional]{title}
\label{lab}  % optional, for cross referencing
text for this unit ...
...

A blank line before or after a sectioning command has no effect.

In addition to providing the heading in the text, the mandatory argument of the sectioning command can appear in two other places: