title: How do you put a period after the section number using the article class?
body: <p>I am using the article class with the code: </p>
  
  <pre><code>\documentclass[12pt]{article}
  
  \begin{document}
  \section{Foo}
  This is an example of foo.
  \section{Bar}
  This is an example of bar.
  \end{document}
  </code></pre>
  
  <p>This produces:</p>
  
  <p>1   Foo</p>
  
  <p>2   Bar</p>
  
  <p>What I want is a period after the section number:</p>
  
  <ol>
  <li><p>Foo</p></li>
  <li><p>Bar</p></li>
  </ol>
  
  <p>I cannot change away from the article class. How would I accomplish this?</p>