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How can I get a big N like the one below?

enter image description here

1 Answers1

5
\documentclass{article}

\usepackage[textmath, active,tightpage]{preview} % don't use in real document
\setlength\PreviewBorder{1em}

\begin{document}
$\mathcal{N}(x|\mu,\sigma^2)$
\end{document} 

enter image description here

(also see symbol for Gaussian distribution)

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