# New line in math mode and indent this line

How can I have a indented new line in math mode? The line after \newindentedline should be indented and start in a new line.

$X \subset Y \Rightarrow \forall x \in X: x \in Y \newindentedline \Rightwarrow X \subset Y$

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You should read the mathmode document.

To allow linebreaks inside mathmode you need an environment like align (provided by amsmath):

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
X \subset Y &\Rightarrow \forall x \in X: x \in Y \\
&\Rightarrow X \subset Y
\end{align}
\end{document}


For manual (or more accurate) positioning of the alignment (rather than having it line up with some content in the row above), using the following instead:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
&X \subset Y \Rightarrow \forall x \in X: x \in Y \\
& \hspace{4em} \Rightarrow X \subset Y
\end{align}
\end{document}


where you specify the indent as the argument to \hspace{...}.

To get a unnumbered equation you can use the align* (see the comment of egreg)

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@Werner: Feel free to edit the post ;-) –  Marco Daniel Oct 9 '11 at 18:36
I'd suggest split or align*, to be consistent with Sebastian's question. –  egreg Oct 9 '11 at 19:06