# Using Greek letters with the Nath package

I'd like to use the Nath package together with a math font which supports Greek letters, while retaining the default font for the non-Greek letters. Is this possible?

I tried compiling the following document with xelatex.

\documentclass[a4paper,12pt]{article}
\usepackage{unicode-math}
\setmathfont[range=\mathbfsfit/{greek,Greek}]{lmmath.otf}
\RequirePackage{nath}
\begin{document}
$$\tilde{T}α$$
\end{document}


It gave me an error:

Nath as of 21 March 2003
Implementing NAtural maTH notation
) (./test2.aux) (/usr/share/texmf/tex/latex/tipa/t3cmr.fd)
! Internal error: bad native font flag


If I remove the range option to setmathfont, or the tilde, the document compiles.

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I don't think so. If I say \setmathfont{XITS Math}, just for a try, it works. Why not simply use \setmathfont{lmmath.otf}? –  egreg Jan 4 '13 at 18:03
I tried that, but saw that it didn't provide some symbols I was using, so commands like notin would give blank output.Is it possible to fall back on the default font in these cases? –  Ben Jan 4 '13 at 19:09

This input file works and shows \notin:

\documentclass[a4paper,12pt]{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\usepackage{nath}

\begin{document}
$$\tilde{T}α\notin X$$

\end{document}

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