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.
[Tex/LaTex] How To Change Math Font Only
fontsmath-mode
Related Solutions
You can do this using the unicode math package. You need to use xelatex or lualatex for this to work (rather than just pdflatex). As a rather simple example, the following switches from italic to upright font within the example environment.
\documentclass{minimal}
\usepackage{unicode-math}
\setmathfont{xits-math.otf}
\newenvironment{example}{\par\textbf{Example:}\setmathfont[math-style=upright]{xits-math.otf}}{\par}
\begin{document}
\[
E = m c^2
\]
\begin{example}
A famous equation is
%
\[
E = m c^2
\]
\end{example}
\[
E = m c^2
\]
\end{document}
(You need to have the STIX fonts for this particular example to work.) This produces:
For more on the syntax, I recommend that you read the unicode-math documentation. I should also warn you that changing the font several times in a document can slow down the compilation time considerably. It might not, I'm not sure exactly what it is that causes the slow-down, but on some documents where I change maths font a lot then I find that I have to disable the font changing when writing the document and only enable it for the final run.
isomath defines \vectorsym, \matrixsym and \tensorsym to typeset vectors, matrices and tensors in an ISO-conformant way. It also loads fixmath to provide correct typesetting for the greek alphabet.
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Best Answer
First select the package that changes the math font and the text font, such as
And then change the text font.