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I have the following formula in my LaTeX code:

$ \mu_{x_{t}} = E(x_{t}) = \int_{a}^{b} $

This gives me the follwing in my document

enter image description here

Now I tried to use \bigint, but that gives me too thick integral... what do I need to do to get the same thickness but with more height?

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3  
Like what happens when you use \displaysize? Or may be you want to use \[\int…\] instead of $\int…$? –  Khaled Hosny Jan 25 '13 at 17:44
    
Oh I didn't know that \displaysize, I will try thnx! I tried \[\int..\] but then my formula moved horizontally much more right and vertically more down?! x) –  jjepsuomi Jan 25 '13 at 17:48
1  
For future reference, have a look at the Not So Short Introduction to LaTeX –  cmhughes Jan 25 '13 at 17:49
4  
@KhaledHosny Shouldn't it be \displaystyle? However, a big integral in an inline formula will irremediably spoil the page. –  egreg Jan 25 '13 at 17:49
    
@egreg: you are right of course :) –  Khaled Hosny Jan 25 '13 at 17:52
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2 Answers 2

up vote 8 down vote accepted

More height comes with display mode:

\[ \mu_{x_{t}} = E(x_{t}) = \int_{a}^{b} \]

Display mode

Or you can only make the integral larger:

$ \mu_{x_{t}} = E(x_{t}) = {\displaystyle \int_{a}^{b} } $

Displaystyle

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Exactly what I was looking for! Thank you! =) –  jjepsuomi Jan 25 '13 at 17:55
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There are a few ways to change the appearance- \displaystyle is one of them, and you can also use \limits, or even a combination:

enter image description here

\documentclass{article}

\begin{document}

\begin{itemize}
    \item $ \mu_{x_{t}} = E(x_{t}) = \int_{a}^{b}$
    \item $\mu_{x_{t}} = E(x_{t}) = \int\limits_{a}^{b} $
    \item $ \mu_{x_{t}} = E(x_{t}) = \displaystyle\int_{a}^{b} $
    \item $ \mu_{x_{t}} = E(x_{t}) = \displaystyle\int\limits_{a}^{b} $
\end{itemize}

\end{document}

For future reference, have a look at the Not so short Introduction to LaTeX

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Thank you! I will =) It's you know sometimes just easier to ask 5 second thing from someone than to read whole book. Sometimes you do find the 5 second thing right away and sometimes you don't and when you don't it usually can scale up to hours, because when you look at one thing then you need to reference another thing and then another and that takes too much time for every single character in thesis ;) –  jjepsuomi Jan 25 '13 at 18:03
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