[Tex/LaTex] How to make a nice fraction in subscript

Question

I wrote

\begin{equation}
M_{\frac{1}{2}}= ...
\end{equation}

but it doesn't look very nice. fraction is too small and and "tight", and when I add \dfrac that is too big. Any solution for this ?

Answer 1

Don't forget nicefrac. And, as erik notes, \sfrac of the xfrac package. Finally, I added a \scriptscriptstyle\frac{}{}.

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{nicefrac,xfrac}
\begin{document}
\begin{align*}
M_{\nicefrac{1}{2}}&= \text{ nicefrac}\\
M_{\sfrac{1}{2}}&= \text{ sfrac}\\
M_{\scriptscriptstyle\frac{1}{2}}&= \text{ \texttt{scriptscriptstyle frac}}
\end{align*}
\end{document}