I need to display this expression, and the way it looks like right now is quite ugly:
Code: Select all
\begin{equation}
|\sum_{i \, \in \, \Xi} \Psi_i |^2
\end{equation}
And I would also love to be able to make the "\in" symbol a little bit smaller so that its base is not lower than the base of my \Xi .
If anyone knows how I may approach these problems, I would GREATLY appreciate your contribution.