Paragraph after \section doesn't indent [duplicate]

Question

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}

the section in article class is defined so, that the paragraph after it is not indented — Zarko, Oct 30 '12 at 16:13
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

m0nhawk · Accepted Answer · 2012-10-30 16:11:53Z

15

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}.

answered Oct 30 '12 at 16:11

m0nhawk

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Can I have a reference for this rule? – ziyuang May 24 '16 at 20:14
@ziyuang For example this. – m0nhawk May 24 '16 at 20:20
You can also do \indent\indent. – Doug Jun 11 '16 at 3:06
@Doug, this double indent hack is perfect! any reason why this works? thanks~ – davyjones Sep 12 '16 at 5:17

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marked as duplicate by doncherry, Mensch, lockstep, Thorsten, diabonas Oct 30 '12 at 19:23