Thanks Herbert, works great.
--- On Wed, 12/1/11, Herbert Voss <Herbert.Voss at FU-Berlin.DE> wrote:
> \documentclass{article}
> \usepackage[T1]{fontenc}
> \usepackage{lmodern}
> \mathversion{bold}
> \begin{document}
>
> $y=f(x)$
> \[\int_1^2\frac{1}{x^2}dx=1\]
>
> \mathversion{normal}
> $y=f(x)$
>
> \end{document}
>
> Herbert