
How can I enter this 'F' in LaTeX?
\mathcal{F} looks quite similar to it, but a little bit different.
I prefer not to use additional package if possible.

How can I enter this 'F' in LaTeX?
\mathcal{F} looks quite similar to it, but a little bit different.
I prefer not to use additional package if possible.
\usepackage{mathrsfs}
$\mathscr{F}$
Take a look at What are all the font styles I can use in math mode?
Boondox. – Bernard Apr 17 '14 at 21:42