Math & Science ⇒ Automatically scaled "|" Symbol

[zainah]

Dear all,

I want to write the equation below, how to make a symbol "|" become same size with the brace size { }.

Code: Select all

\begin{equation}
d \Omega_{0} = \Span\left\{\frac{\partial \phi}{\partial x} | \phi \in \Omega_{0} \right\}.      
\label{eqae9}
\end{equation}

[localghost]

Please get used to always providing a minimal example that is compilable out of the box for everybody and serves for testing possible solutions. It is not the first time that you are asked for this. I only know where the \Span command comes from because I was the one who suggested it in one of your former questions*.

Similar to the \left and \right pairs there also exists the \middle command (from eTeX) for such cases.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}

\DeclareMathOperator*{\Span}{span}

\begin{document}
  \begin{equation}\label{eqn:eqae9}
    d \Omega_0=\Span\left\{\frac{\partial\phi}{\partial x} \;\middle|\; \phi\in\Omega_0\right\}. 
  \end{equation}
\end{document}

* By the way, it would be very kind if you give some feedback on proposed solutions. You should at least accept the answer that led you to the solution.


Thorsten