How to set up title number three, and how to display the directory level 3 heading

1. How to set up title number three

Directly subsubsection {xxx} command, may occur three unnumbered title circumstances and can not wrap properly.

We need to solve this problem:
Reference numeral setting, \ area between documentclass and \ begin {document} incorporated tex command file header \ setcounter {secnumdepth} {3} provided the title level 3 depth.
 
 
2. Level 3 how to display the title in the catalog
When using tableofcontents command, the directory is displayed by default Level 2 headline: section and subsection. Level 3 heading subsubsection If you want to display can be controlled through the command setcounter command.
Specifically, the following:
Before tableofcontents command, the command is introduced \ setcounter {tocdepth} {3} level depth is set to 3 directory.

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Origin www.cnblogs.com/TTTTT/p/11504086.html