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In the following example, I would like to to keep the Q''(p) on the same line as the rest of the equation, and put the vinculum and 2 underneath.

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}

\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \phi(p)\frac{Q''(p)}{2} \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}

The equation currently looks like this: enter image description here

And I would like something like this: enter image description here

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Why not put \phi(p) in the numerator, as well? –  Andrew Uzzell Oct 12 '12 at 14:43
2  
Welcome to TeX.SX! What would be the special meaning? –  egreg Oct 12 '12 at 14:44
    
@Andrew Oh, I could, and honestly, I'm not sure I like either of these layouts. Most likely I will just use \frac{1}{2} in front of the Q''. I was just curious how one could do this. –  AGS Oct 12 '12 at 14:44
    
@egreg, Thanks! I am not sure of any special meaning, just curious as to how one could do this. Maybe not for this eq. but perhaps somewhere down the road this would be useful. –  AGS Oct 12 '12 at 14:50
4  
@AGS Yes, it can be done, of course. But it's contrary to centuries of mathematical typography. –  egreg Oct 12 '12 at 14:52

3 Answers 3

up vote 1 down vote accepted

This "crazy" variant of a fraction is generated by \underline and an operator subscript:

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}

\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \phi(p)\mathop{\underline{Q''(p)}}\limits_{\textstyle2}
  \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}

Result

For comparison, other variants from the comments:

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}

\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \frac{\phi(p)\, Q''(p)}{2}
  \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}

Result

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}

\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \frac{1}{2}\,\phi(p)\, Q''(p)
  \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}

Result

With smaller digits:

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{textcomp}

\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \tfrac{1}{2}\, \phi(p)\, Q''(p)
  \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}

Result

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With no measurement (available only in display math mode):

\def\crazyfrac#1#2{\raisebox{-\fontdimen8\textfont2}{$\displaystyle\frac{#1}{#2}$}}

enter image description here

It's horrible and, above all, confusing. I decline any responsibility in case of use of this macro in a real document.

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+1 we should get this engraved on your tombstone (not that you need one yet) –  David Carlisle Oct 12 '12 at 15:37
4  
@DavidCarlisle Inside a 257 side regular polygon constructed with ruler and compass in TikZ. –  egreg Oct 12 '12 at 15:41

Don't do this or @egreg will never forgive me.

enter image description here

\documentclass[12pt,reqno]{amsart}
\usepackage{amsfonts}
\usepackage{amsmath}

\def\horriblefrac#1#2{%
  \setbox0\hbox{$\displaystyle#1$}%
  \setbox2\hbox{$\displaystyle\frac{#1}{#2}$}
  \dimen0\ht0
  \advance\dimen0-\ht2
  \raise \dimen0 \box2}
\begin{document}
\begin{align}
  \label{eq:3of3}
  \int_{0}^{1} \phi(p)\horriblefrac{Q''(p)}{2} \int_{0}^{1} (\Delta p)^{2}\mathcal{P}(\Delta p)\; \mathrm{d}p'\; \mathrm{d}p
\end{align}
\end{document}
share|improve this answer
    
You're forgiven, but my macro is better than yours. –  egreg Oct 12 '12 at 15:32

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