fractionsmath-mode
Possible Duplicate:
Separate long math text under sum symbol into different lines?
I'm trying to write a math formula like this:
\sum_{ \frac{n=0}{(n+k-i) \text{~even}} }^{k-i}
This looks just as I want it, but I don't want the bar between n=0 and (n+k-i) text.
I tried using the matrix env,
\sum_{ \begin{matrix}{n=0}\\{(n+k-i) \text{~even}}\end{matrix} }^{k-i}
But that looks really bad, because the (n+k-i) text is too large.
I think the problem here is that you are using inline math mode $..$ as opposed to display mode \[...\]. Here is the comparison of the output between the two:
with the second one producing better spacing. To obtain that you need to either use one of the following
\[\frac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}\]
$\displaystyle \frac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$
$\dfrac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$
Note that \dfrac requires that the amsmath package be loaded, either by including it explictly \usepackage{amsmath}, or as part some other package that already includes amsmath, such \usepackage{mathtools}.
Here is the MWE. Note that the center environment was only used to simplify the image capture.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{center}
$\frac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$
\end{center}
\[\frac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}\]
\begin{center}
$\displaystyle \frac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$
\end{center}
\begin{center}
$\dfrac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$
\end{center}
\end{document}
To make the bar wider you can use \overline as in:
$\dfrac{\overline{p}_1}{\overline{p}_1 + \overline{h}_1}$
or adapt the xoverline from The \bar and \overline commands with which you can adjust the spacing:
$\dfrac{\xoverline{p}_1}{\xoverline{p}_1 + \xoverline{h}_1}$
or specify you want it wider with:
$\dfrac{\xoverline[1.25]{p}_1}{\xoverline[1.25]{p}_1 + \xoverline[1.25]{h}_1}$
Here is a comparison between \bar{p}_1, \overline{p}_1, \xoverline[1.25]{p}_1}, and {\xoverline[1.50]{p}_1
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newsavebox\myboxA
\newsavebox\myboxB
\newlength\mylenA
\newcommand*\xoverline[2][1.00]{%
\sbox{\myboxA}{$\m@th#2$}%
\setbox\myboxB\null% Phantom box
\ht\myboxB=\ht\myboxA%
\dp\myboxB=\dp\myboxA%
\wd\myboxB=#1\wd\myboxA% Scale phantom
\sbox\myboxB{$\m@th\overline{\copy\myboxB}$}% Overlined phantom
\setlength\mylenA{\the\wd\myboxA}% calc width diff
\addtolength\mylenA{-\the\wd\myboxB}%
\ifdim\wd\myboxB<\wd\myboxA%
\rlap{\hskip 0.5\mylenA\usebox\myboxB}{\usebox\myboxA}%
\else
\hskip -0.5\mylenA\rlap{\usebox\myboxA}{\hskip 0.5\mylenA\usebox\myboxB}%
\fi}
\makeatother
\begin{document}
$\dfrac{\bar{p}_1}{\bar{p}_1 + \bar{h}_1}$\quad
$\dfrac{\overline{p}_1}{\overline{p}_1 + \overline{h}_1}$\quad
$\dfrac{\xoverline[1.25]{p}_1}{\xoverline[1.25]{p}_1 + \xoverline[1.25]{h}_1}$
$\dfrac{\xoverline[1.50]{p}_1}{\xoverline[1.50]{p}_1 + \xoverline[1.50]{h}_1}$
\end{document}
If you \usepackage{amsmath} then in math mode (in particular, inside \frac) you can use \text{VP Beneficios} to get text. If you want white space you need to include it: \text{ VP Beneficios }
Best Answer
try
maybe this is what you want to achieve.