Robert Neumann wrote:

> Hello,
> I am using Lyx 1.2.1 and \usepackage{mathptmx}
> I exported my file to a .pdf which worked fine for linux and
> windows98 But when I tried to open it with a mac, the pi and the
> infinity symbol were gone... There was just white space.
> Does anybody know how to solve this problem?
> Thanks
> Robert Neumann

Make sure that you embed the fonts in your document.
For example, were you to use ps2pdf, you might use this:
ps2pdf -dMaxSubsetPct=100 -dCompatibilityLevel=1.2 -dSubsetFonts=true 
-dEmbedAllFonts=true

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