How to add quotation marks to fractions?

Question

As the title says I want to add quotation marks around a fraction in \displaystyle mode. My first try looks very unnatural, as you can see

^{``}\frac{1}{0^-}^"

The problem is with the first quotation mark: how do I put it at the same height as the second one?

Answer 1

The following minimal example provides \mathquotes{<stuff>} that puts quotes around <stuff> in math mode at the same level of the highest element (in \displaystyle):

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{graphicx}% http://ctan.org/pkg/graphicx
\newsavebox{\mathbox}\newsavebox{\mathquote}
\makeatletter
\newcommand{\mathquotes}[1]{% \mathquotes{<stuff>}
  \savebox{\mathquote}{\text{``}}% Save quotes
  \savebox{\mathbox}{$\displaystyle #1$}% Save <stuff>
  \raisebox{\dimexpr\ht\mathbox-\ht\mathquote\relax}{``}#1\raisebox{\dimexpr\ht\mathbox-\ht\mathquote\relax}{''}
}
\makeatother
\begin{document}
\[\text{``}\frac{1}{0^-}\text{''} \quad \mathquotes{\frac{1}{0^-}}\]
\end{document}