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enter image description here

I have seen \mathfrak{F}, \mathcal{F} and \mathscr{F}, but none of those render the fancy fourier f given in the figure above. Is there any package for that?

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    Looks like the commercial Adobe Mathematical Pi fonts.
    – campa
    Jan 28 at 18:25

1 Answer 1

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I agree with @campa that the script-F glyph in the OP's screenshot comes from the commercial Adobe Mathematical Pi font. A close substitute that's free of charge is the "oblique" version of the mathrsfs package.

The lowercase-f letters in the OP's screenshot are some version Times Roman. To replicate this "look", I load the newtxmath package. (If you happen to have access to the MathTime Professional Two math font package, you'll get an even closer replica, especially for the "hat" symbol on top of the first instance of f.)

enter image description here

\documentclass{article}
\usepackage{newtxmath} % for Times Roman clone math font
\usepackage[scr=rsfso]{mathalfa} % "oblique" version of mathrsfs

\begin{document}
$\hat{f}=\mathscr{F}(f)$
\end{document}
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