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.
[Tex/LaTex] script F (or something like it)
math-modesymbols
Related Solutions
Essentially these symbols seem to be available in the MathTime Professional 2 Fonts. In particular page 35 of the user guide gives a complete alphabet of "curly" capital letters including these symbols:
The symbol is a scipt uppercase T in math mode. The package euscript should fit your needs.
Try
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage[mathcal]{euscript}
\begin{document}
\begin{equation*}
\mathcal{T}
\end{equation*}
\end{document}
to obtain
Best Answer
Take a look at What are all the font styles I can use in math mode?