# How To Change Math Font Only?

I'd like to keep my text in Helvetica as usual but would like to have my equations and formulas in Roman or MT Extra. So far, I've tried using different packages but that changes both the text and the math. I'm writing my document using LaTeX.

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First select the package that changes the math font and the text font, such as

``````\usepackage{mathpazo}
``````

And then change the text font.

``````\renewcommand\rmdefault{hpv}% or whatever
``````
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The codename for Helvetica is "phv" ("p" for postscript (adobe) and "hv" for helvetica). –  Philippe Goutet Nov 20 '10 at 8:26
@Philippe: Oh! I always wondered about the strange names. –  TH. Nov 20 '10 at 10:28