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I've seen bigints for big integral symbols, but I'd like to make a large \mathcal{F} for a Fourier transform. Is there a good way to do this?

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Look at the \mathlarger command of the relsize package. – egreg May 7 '12 at 13:12

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You may use \scaleboxfrom the graphicx package:

\documentclass[11pt,a4paper]{article}
\usepackage{graphicx}
\newcommand*{\bigF}{\scalebox{1.5}{\ensuremath{\mathcal{F}}}}

\begin{document}
 \[
\bigF (\omega)=\int f(x)e^{i t x}dt
\]
\end{document}
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Do not use \ensuremath in such situations. There is no need to use it here since \scalebox puts its contents in the text mode, so a better way here would be \newcommand{\bigF}{\scalebox{1.5}{$\mathcal{F}$}}. And even then, the symbol should be scalable, with different size of the letter F, so the use of the \mathchoice command would help here a lot. – tohecz May 7 '12 at 21:07
@tohecz You are right. I had a typo and believed it were due to the definition, but it was in the example, so I got an error message. – Peter Breitfeld May 7 '12 at 22:47

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