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Possible Duplicate:
How can I indent the paragraphs which follow a heading?

I want to ask why "Hello!" doesn't indent.

% work1.tex
\documentclass{article}
\begin{document}
   \section{Introduction}

   Hello!

   Hi

\end{document}
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marked as duplicate by doncherry, Kurt, lockstep, Thorsten, diabonas Oct 30 '12 at 19:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1  
the section in article class is defined so, that the paragraph after it is not indented – Zarko Oct 30 '12 at 16:13
1  
Welcome to TeX.SE. The point of indenting a paragraph is to make it obvious that this is the start of a new paragraph. After a \section it is obvious that it is the start of a new paragraph so no indent is added. – Peter Grill Oct 30 '12 at 16:17
up vote 11 down vote accepted

That's a common rule for indent in some languages: it's indent only the second and other paragraph.

If you want indent first paragraph too: \usepackage{indentfirst}.

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Thanks! It really helps a lot! – Jeff Hsieh Oct 30 '12 at 16:26
    
Can I have a reference for this rule? – ziyuang May 24 at 20:14
    
@ziyuang For example this. – m0nhawk May 24 at 20:20
    
You can also do \indent\indent. – Doug Jun 11 at 3:06

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