How to get a large division symbol?

I'm using:

\documentclass[journal,transmag]{IEEEtran}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{breqn}
\begin{document}
\begin{align}
something&\left(\sum_{n}\right.\nonumber\\
\end{align}
\end{document}


With \vphantom{\sum_{n}} I get the big right parenthesis in the second line which is what I want. How can I get a larger division symbol as well?

• Larger how? Would it be possible for you to include an image of what you want to achieve? – Alenanno Apr 24 '15 at 19:53

I understand it's only an example, but your usage of \left and \right is wrong.

\begin{align}
something &\biggl(\sum_{n}\nonumber\\
\end{align}


• Why does your code complain in my Tex? :| It says "missing } inserted", "extra \right", "missing \endgroup inserted" etc... – Alenanno Apr 24 '15 at 20:00
• @Alenanno I forgot to remove a \right. – egreg Apr 24 '15 at 20:00
• Ah ok, fixed. :) – Alenanno Apr 24 '15 at 20:02

To get the scaled division symbol, you probably want to use the \left ... \middle ... \right construction:

\begin{align}
something&\left(\sum_{n}\right.\nonumber\\