Vertical line fitted with bracket

Question

How can i write the vertical line which is fitted witch the brackets. I have a big bracket because of summation and line don't look good. I tried to use \mid but it also doesn't work. Sample of my code.

$E\left[ \sum\limits_{i=1}^{k+1} \E_i^{(v)} - E \left[ \sum\limits_{i=1}^{k+1} \E_i^{(v)}  \right] | \mathcal{F}_k \right]$

Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. — Community, Jun 25 '22 at 13:29
This question is different from the supposed duplicate. This is about making a line resizing with outer brackets, and the supposed duplicate is about the reasoning behind the name “\mid”. I suggest to reopen this question. — matj1, Oct 18 '23 at 14:33
I can't reply to this, but I would say that what you want is \middle|. The accepted solution is not flexible; it does not work for all sizes of brackets. My solution sets the size automatically according to the outer brackets. — matj1, Oct 18 '23 at 14:35

score 0 · Accepted Answer · answered Jun 25 '22 at 13:29

You can use \Bigg (or \big, \Big, \bigg):

\documentclass{article}
\begin{document}
$E\left[ \sum\limits_{i=1}^{k+1} E_i^{(v)} - 
    E \left[ \sum\limits_{i=1}^{k+1} E_i^{(v)} 
    \right] \Bigg| \mathcal{F}_k \right]$
\end{document}

Vertical line fitted with bracket

1 Answers1