MathJax doesn't work on my site

I’m trying to get MathJax (http://www.mathjax.org/) to work on my WordPress 3.6.1 site. I’ve linked to the MathJax script using this script from their site:
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeXAMSMML_HTMLorMML"> </script>
And I get no errors in my browser console, but for some reason, LaTeX code on my page, specifically, $\int\limits_{n=0}^{\infty}$, doesn’t render as prettyprinted math, rather just as the source code.
I’ve tried some of the bona fide WP plugins that have similar functionality, but most of the render math as a PNG rather than type, and the remainder have nonstandard notations.
Are there any additional steps to take? Is WordPress suppressing MathJax somehow?
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