# Problem with mathring and subscripts

I am trying to use \mathring with a subscript and a superscript. I try

{{ \mathring {\omega}}^{ab}}_{\mu}


where I have put

{ \mathring {\omega}}^{ab}


in an extra set of parentheses in the hope that the mu will be set to the right of the 'ab', but it comes out underneath it. I can make things work by using

{ \mathring {\omega}^{ab}}_{\phantom{ab}\mu}


but this seems rather clumsy. Why is the usual trick for index spacing not working? Is there a neater way to get what I want?

my preamble starts with

\usepackage{amsfonts}
\usepackage{amssymb}


It seems fine, but if you want, just set the subscript with a separate {}_{\mu}:

\documentclass{article}

\usepackage{amsmath}

\begin{document}

${{ \mathring {\omega}}^{ab}}_{\mu} \quad \mathring {\omega}^{ab} {}_{\mu}$

\end{document}


You have to add an empty group.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\mathring{\omega}^{ab}_{\mu}$\qquad
${{}\mathring{\omega}^{ab}}_{\mu}$\qquad

\end{document}