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I am working on a poster in Latex. I found that the integral sign (and also the summation sign) appears to be small. What could make this happen? I never see this in a regular article. I guess it must have something to do with the poster template. I'm using this template: https://www.overleaf.com/latex/examples/quadratic-function/hjbvztxdrvwf#.WRUGqtIrLIU

enter image description here

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    This could be related? Also here – Au101 May 12 '17 at 0:54
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The problem is that the fontsize you (or your template) are using is rather big and does not contain an integral symbol of this size. To fix this, you can use the exscale package or another font that does contain the symbol in the required size.

\documentclass[final]{beamer}
\usepackage[scale=1.24]{beamerposter} 
\usetheme{confposter} 
\usepackage{booktabs} 
\author{matematika.pl} 
\institute{2015} 

\usepackage{exscale}

\begin{document}
\begin{frame}[t]

\begin{equation}
    H(f)(x) = \int f(x-t) \frac{dt}{t}
\end{equation}

\end{frame}
\end{document}

enter image description here

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