\mathscript{F} yields undefined control sequence error

Question

I am using MiKTeX 2.9 for compiling my TeX documents. I am getting an error with contains the line $\mathscript{F}$ showing that it is undefined control sequence. How should I rectify it?

Answer 1

You're perhaps after $\mathscr{F}$ from the mathrsfs package.

\documentclass{article}
\usepackage{mathrsfs}
\begin{document}
$\mathscr{F}$
\end{document}