# Breaking line inside a set

How can I write

$A=\Bigg\{\alpha\in \mathbb{Z}G : \alpha\ \text{is a unit in}\ \mathbb{Z}G\ \text{with}\ \varepsilon(\alpha)=1\ \text{and}\ \alpha+\Delta(G,G')\ \text{has finite multiplicative order in}\ \mathbb{Z}G/\Delta(G,G') \Bigg\}$


So that it looks like While I am trying to use \\ is not working well, and neither multline.

This is what I am asking-- ## 1 Answer

I would use align* which allows to use more lines, if necessary.

Also I would use all the textual sentence inside a single \text{} and use  for math contents inside it.

\begin{align*}
A=\bigl\{\alpha\in \mathbb{Z}G :{}& \text{$\alpha$ is a unit in $\mathbb{Z}G$ with $\varepsilon(\alpha)=1$}\\
& \text{and $\alpha+\Delta(G,G')$ has finite multiplicative order in $\mathbb{Z}G\mathbin{/}\Delta(G,G')$} \bigr\}
\end{align*} MWE

\documentclass{report}
\usepackage{amsmath,amsfonts}
\usepackage{lipsum} % dummy text

\begin{document}
\lipsum*
\begin{align*}
A=\bigl\{
\alpha\in \mathbb{Z}G
:{}&
\text{$\alpha$ is a unit in $\mathbb{Z}G$ with $\varepsilon(\alpha)=1$}\\
&    \text{and $\alpha+\Delta(G,G')$ has finite multiplicative order}\\
&    \text{in $\mathbb{Z}G\mathbin{/}\Delta(G,G')$}
\bigr\}
\end{align*}
Solution proposed by \texttt{@daleif}.
$A=\bigl\{ \alpha\in \mathbb{Z}G : \parbox[t]{.7\linewidth}{\raggedright% \alpha is a unit in \mathbb{Z}G with \varepsilon(\alpha)=1 and \alpha+\Delta(G,G') has finite multiplicative order in \mathbb{Z}G\mathbin{/}\Delta(G,G') \bigr\}. }$
\lipsum*
$A=\left\{\ \parbox[c]{.8\linewidth}{%\raggedright% \alpha\in \mathbb{Z}G : \alpha is a unit in \mathbb{Z}G with \varepsilon(\alpha)=1 and \alpha+\Delta(G,G') has finite multiplicative order in \mathbb{Z}G\mathbin{/}\Delta(G,G') \bigr\}. }\ \right\}$

\end{document} • Why not just use a \parbox[t]{somewidth}{\raggedright all the math in the world}? That is what I usually do (combined with a rare exception from the rule of never using \\ inside normal text) – daleif Jul 24 '15 at 10:52
• is there a way to make these brackets {, } to contain all three lines, like we write on paper? – Bhaskar Vashishth Jul 24 '15 at 11:01
• I want both braces to include whole text, although it is not used in any book, I am just curious. I will try to edit in pic what I am asking for – Bhaskar Vashishth Jul 24 '15 at 11:08
• @BhaskarVashishth, just use \left\{ ... \parbox[c]{some width}{\raggedright ....} \right\}, note how the \} is out side the \parbox. It does not look nice by default – daleif Jul 24 '15 at 11:09
• @Sigur, two of them, your last example does not have alignment on the :, see my comment to Bhaskar above. – daleif Jul 24 '15 at 11:29