How to produce such centred effect?

Question

I want to put my problem description the way it is done in the image i.e. centred, justified and with a little margin on both sides. I am able to do the rest of math correctly

problem description

A more general question that answers this one: How can I change the margins for only part of the text? — Werner, Jul 01 '13 at 05:48
@Werner Looking at the new answers to this question, I think we should indeed close this one as a duplicate. — lockstep, Jul 01 '13 at 10:20
@lockstep I don't think this is a duplicate; the other question asks something quite different (the ragged right setting here is definitely not wanted). This is a place where your quoting package can be used. — egreg, Jul 01 '13 at 11:34

score 8 · Accepted Answer · answered Jul 01 '13 at 05:23

8

All you have to do is to put the text "Given a topic ... being redundant." in a quote environment:

\begin{quote}
  \itshape
  Given a topic ..... being redundant.
\end{quote}

answered Jul 01 '13 at 05:23

karlkoeller

124,410

score 2 · Answer 2 · answered Jul 01 '13 at 08:50

KOMA-Script has an {addmargin} environment taking a mandatory argument to set both margins and an optional argument to define the different margins.

\documentclass{scrartcl}

\usepackage{lipsum}

\begin{document}
\lipsum[1]
\begin{addmargin}{2em}
   \lipsum[2]
\end{addmargin}
\lipsum[1]
\end{document}

addmargin

But I recommend to define a now environment in terms of logical markup (your text seems not to be a quote …). With such a defined environment later changes are easy and can be made consistently.

\documentclass{scrartcl}

\usepackage{lipsum}

\newenvironment{definition}{%
    \addvspace{\baselineskip}%
    \begin{addmargin}{3em}%
        \itshape\noindent
}{%
    \end{addmargin}%
    \vspace{\baselineskip}%
}

\begin{document}
\lipsum[1]
\begin{definition}
   \lipsum[2]
\end{definition}
\lipsum[1]
\end{document}

definiton

Furthermore there are some packages offering a better interface to define theroem like environments …

score 1 · Answer 3 · answered Jul 01 '13 at 10:18

Just for the record since I myself use quote for this.

If you want increase the margins just as the paragraph indentation (\parindent) a simple solution without environments is {\narrower .... }. Aside from personal preferences about what markup is more clear, with this method is easy increase the margin x2, x3, etc. times the paragraph indentation, but a \st{disavantage} "feature" of this command is that in tests without any indentation (\setlength{\parindent}{0em}) the "quotes" are just as normal text.

\documentclass{article}
\usepackage{lipsum,xcolor}
\setlength{\parskip}{2ex}
\setlength{\parindent}{1em}
\begin{document}
\lipsum[2] % normal margin
{\em\color{blue}\narrower \lipsum[2]} % margin + parindent (+1em)
\lipsum[2] % normal margin
{\narrower\narrower\narrower\em\color{red} \lipsum[2]}% (+ 6em)
\lipsum[2] % normal margin 
\end{document}

MWE

Rather than using \narrower, which is a foreign command to LaTeX (and can give unexpected results), I would suggest the quoting package that allows for easy customizations. — egreg, Jul 01 '13 at 10:26
@egreg, although I 'm not aware of such unexpected results, I repeat: Just for the record :-) — Fran, Jul 02 '13 at 03:51

How to produce such centred effect?

3 Answers3