Math & Science ⇒ Need help for Integral

[kenji]

Hello world ^_^
I'm new in this community and I have a question for you:
I want to write this:

integrale1.png (5.86 KiB) Viewed 2164 times

but if i write on my LaTeX editor:

Code: Select all

\int_{ \hat{\sigma}_{\mathrm{peak}} \sqrt{\mathrm{PCE_{peak}}} }^{\infty}
\frac{1}{\sqrt{2\pi\hat{\sigma}_i^2}} e^{\frac{x^2}{2\hat{\sigma}_i^2}} \, \mathrm{d}x

i obtain this:

integrale2.png (7.3 KiB) Viewed 2164 times

Could you help me?^^

[gmedina]

Hi,

you could try something along these lines:

Code: Select all

\documentclass{report}
\usepackage{kpfonts}
\usepackage{amsmath}

\begin{document}

\[
  \int\limits_{ \hat{\sigma}_{\textrm{peak}} \sqrt{\rule{0pt}{2ex}\textrm{PCE$_\textrm{peak}$}} }^{\infty}
  \frac{1}{\sqrt{2\pi}\hat{\sigma}_i^2} e^{\frac{x^2}{2\hat{\sigma}_i^2}} \, \mathrm{d}x
\]

\end{document}

[localghost]

In case you are using amsmath, check the options that are passed to this package. The default behaviour of integrals in displayed math expressions is shown in your first picture.


Best regards and welcome to the board
Thorsten¹

[kenji]

Thank you very much ^_^