Using mathspec \setmathfont with \newenvironment

Question

I would like to change back and forth between two fonts. But I would like these two fonts to affect both normal text, as well as the digits and letters in maths mode. Something like this should work fine...

\documentclass{minimal}
\usepackage{unicode-math}

\newenvironment{example}{\setmathfont{Arial}\setmainfont{Arial}}{}
\newenvironment{exampletwo}{\setmathfont{Bradley Hand ITC}\setmainfont{Bradley Hand ITC}}{}

\begin{document}
\begin{example}  Prove the 33 is a factor of $2^{55}+1$ \end{example}\\
\begin{exampletwo}
 First note 33 that $2^{55}+1 &=(2^5)^{11}+1$
\end{exampletwo}
\item
\end{document}

The problem comes when I try to use something like \cdots, since the fonts I'm using don't have full maths support. I have got round this by using mathspec and something like

 \setmathfont(Digits,Latin){Bradley Hand ITC}

so all the symbols remain as the default font. But I can't get \setmathfont with the mathspec package to work in the \newenvironment command.

Any help greatly appreciated.

Many Thanks

Answer 1

You want to do the font declarations in the preamble, and just switch math versions in the environments.

\documentclass{article}
\usepackage{fontspec,unicode-math}
\setmainfont{Arial}
\DeclareMathVersion{bhitc}
\setmathfont[version=normal]{Arial}
\setmathfont[version=bhitc]{Bradley Hand ITC}
\newenvironment{example}{\mathversion{normal}}{}
\newenvironment{exampletwo}{\mathversion{bhitc}}{}

\begin{document}
\begin{example}  Prove the 33 is a factor of $2^{55}+1$ \end{example}\\
\begin{exampletwo}
 First note 33 that $2^{55}+1 =(2^5)^{11}+1$
\end{exampletwo}

\end{document}