# how to adjust the bar in the notation for the derivative assigned in $s = 0$?

How can I do this bar with the size adjusted? • Personnally, I would write$\vu(s)$ on the left of the vertical line – Bernard May 31 at 14:34
• I agree it looks better. I only put the print as it has written in the paper. – George May 31 at 14:43

• I use the \left and \right approach.
• With \left. you create an "empty" \left. See Equation 2 where I used \left| instead.
• With \right| you create the bar that you want.
• Equation 3 is just a typographical addition and un-related to the question (\text{d} instead of d). Some people prefer it that way.

\documentclass{article}

% amsmath + improvements (here used for \text in math mode)
\usepackage{mathtools}

\begin{document}

\begin{equation}
\left.\frac{d}{ds}\right|_{s=0} \nu(s)
\end{equation}

Equation 2 ist just to show the effect of \texttt{\textbackslash left.} compared to \texttt{\textbackslash left|}.
\begin{equation}
\left|\frac{d}{ds}\right|_{s=0} \nu(s)
\end{equation}

\begin{equation}
\left.\frac{\text{d}}{\text{d}s}\right|_{s=0} \nu(s)
\end{equation}

\end{document} Like this? (with amendments suggested by Manuel Kühner and egreg) \documentclass{article}
\begin{document}
$\displaystyle \frac{d}{ds}\bigg\vert_{s=0} \nu(s) \quad\mbox{or}\quad \frac{d\nu(s)}{ds}\bigg|_{s=0} \quad\mbox{or}\quad \nu\mkern1mu'(0)$
\end{document}

• +1: I think that I have never used \vert before :). – Dr. Manuel Kuehner May 31 at 14:46
• @Dr.ManuelKuehner \bigg| would do as well. – egreg May 31 at 15:00
• I'm not sure how this is preferable to \nu'(0). But I'm a mathematician, you know… – egreg May 31 at 15:01
• @egreg Thanks! That's easy to remember. – Dr. Manuel Kuehner May 31 at 16:23

It is very simple with the diffcoeff package:

\documentclass{article}
\usepackage{diffcoeff}

\begin{document}

$\diff{ν(s)}{s}[s=0]$%

\end{document} I add my answer using derivative package:

\documentclass[a4paper,12pt]{article}
\usepackage{amssymb}
\usepackage{derivative}
\begin{document}
$\odv{\nu(s)}{s}_{s=0}\quad \text{ or } \odv*{\phantom{d}}{s}_{s=0}\nu(s)$
\end{document}


PS: Actually in this laptop I have not MikTeX installed. I'm using Papeeria. If someone could please edit my answer and enter a confirmation screenshot, I am grateful. Thank you all and welcome.

Using another old package (it is not very used) called physics package you can obtained.....

\documentclass[a4paper,12pt]{article}
\usepackage{amssymb}
\usepackage{physics}
\begin{document}
$\eval{\dv{s}}_{s=0}\nu(s), \quad \eval{\dv{\nu(s)}{s}}_{s=0}$
\end{document}


....this output: 