# How can I make large mathcal symbols?

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?

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

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}

-
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