# indent a paragraph of a new section

The following code is to start a new section with a paragraph indented. However the paragraph is not indented. I also need to use flush left in order to keep the alignment proper. I would appreciate it if someone can help me with this

\chapter{Related Work}
\label{chapter3}

\section{Channel Characterization}

\setlength{\parindent}{5ex}
\begin{flushleft}

Accurately characterizing the wireless small-scale

• flushleft sets \parindent to \z@ (0pt). So to have indentation you need to move \setlength{\parindent}{5ex} behind \begin{flushleft}. Apr 10 '17 at 5:49
• Please always show a minimal working example instead of a code snippet. Good answers often depend on several circumstances, i.e., the class you are using. Questions without MWE are often somehow unclear. Apr 10 '17 at 6:59

To indent the first paragraph of each section use:

\usepackage{indentfirst}


For the whole document to have left justification use:

\usepackage[document]{ragged2e}


In case you don't want indentation in your first paragraph (e.g. an abstract) use \noindent before your paragraph.

• Thanks. How about if i want to indent paragraphs within a section and paragraphs in subsections
– ray
Apr 10 '17 at 2:09
• It should be okay, indentfirst indents all the first paragraphs in all sections and subsections. Apr 10 '17 at 5:42

The titlesec package allows to customize \section command and friends. Using the non-starred version of \titlespacing does not prevent the indentation of the first paragraph. This does not seem to work with flushleft, though.

\documentclass{article}
\usepackage{titlesec}
% default values copied from titlesec documentation page 23
% "The starred version kills the indentation of the paragraph following the title" titlesec documentation page 4
\titlespacing{\section}
{0pt}% left margin
{3.5ex plus 1ex minus .2ex}% space above the heading
{2.3ex plus .2ex}% space below the heading

\usepackage{blindtext}
\begin{document}
\section{Section~A}
\Blindtext
\section{Section~B}
\Blindtext
\end{document}


• This answer does not pay attention to the problem caused by usage of flushleft. Apr 10 '17 at 6:57