Indent 2nd line of an item in description environment

I have some equations that span multiple lines. In the document, I have the following description environment:

\begin{description}
\item[(F1)]
$First Line \\$,
$Second Line \\$
$Third Line$
\end{description}


The effect that I am trying to achieve, is to indent the second line and third line as follows, but it does not work:

\begin{description}
\item[(F1)]
$First Line \\$,
\quad $Second Line \\$
\quad\quad $Third Line$
\end{description}


I have tried using \quad inside and outside the , but failed. Any advice is greatly appreciated.

P.S. The solutions suggested in How to indent second line of an item enumerate are not what I need. Also, I am not able to change any formatting commands. I need to do this simply by using something like \quad, \hspace.

2 Answers

Use \hspace*, and write \\ outside mathmode:

\begin{description}
\item[(F1)]
$First Line$,\\
\hspace*{1em}$Second Line$ \\
\hspace*{2em}$Third Line$
\end{description}


Why not define each line as a paragraph instead of breaking the line with \\ ? This allows for \quad to work. Also you can use \qquad for double quad.

my suggestion:

\begin{description}
\item[(F1)]
$First Line$,

\quad $Second Line$

\qquad $Third Line$
\end{description}