Large letter in align environment

Question

I have the following formula in an align environment

\documentclass[12pt]{article}

\begin{document}
\begin{align}
\hspace*{5mm}w_{c} = \large{\textit{f}} _{w,c} * \frac{log(|C|)}{\int _{w,C}}
\end{align}
\end{document}

But I want that function sign f to be much larger. I can do this with \mathcal, but I cannot manage it with ordinary letters.

Answer 1

Put the size specification inside the \textit.

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\hspace*{5mm}w_{c} = {\textit{\LARGE f}} _{w,c} * \frac{\log(|C|)}{\int _{w,C}}
\end{align}
\end{document}