[OS X TeX] Beamer math fonts

[Themis Matsoukas]

I need to create an equation that matches the sans serif math font in beamer. How do I specify these fonts? I tried typesetting the equation in beamer but it sets the background of the pdf to opaque while I need it to be transparent.

Themis

PS: Apologies if this is a multiple posting. I just changed my email for this list and a previous attempt to post, apparently sent from the wrong address, did not seem to go through.