This question is answered over at tex.stackexchange.com
- https://tex.stackexchange.com/questions/24439/how-to-add-a-dot-after-the-section-number
- https://tex.stackexchange.com/questions/191581/how-can-i-add-dot-after-the-subsection-number
There are 4 ways to solve this:
titlesec package:
\usepackage \titlelabel{\thetitle.\quad}
You can use the secdot package:
\documentclass \usepackage \begin \chapter \section \end
The package documentation is your friend. The following adds a dot after the subsection number(s):
Example:
\documentclass \usepackage \sectiondot \begin \section \subsection \end
If you want that in all places the section number appears as "1.1.", also in cross references, the question is settled quite easily:
\renewcommand{\thechapter}{\arabic.} \renewcommand{\thesection}{\thechapter\arabic.}
(in this case you would also change chapter numbers, for uniformity).
If you want only the number in the section title to be followed by a period, then you can follow Alan's good suggestion or delve into the internals (see the FAQ entry for more information):
\makeatletter \renewcommand{\@seccntformat}[1]{\csname the#1\endcsname.\quad} \makeatother
This will change the format of all the sectional units also below \section. You might prefer the titlesec way to get more control on the appearance of the section headings.
If you use Komascript you may use the option
numbers=endperiod
.Example:
\documentclass[11pt,english,numbers=endperiod] \usepackage \usepackage \begin \tableofcontents \blinddocument \end