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You have to look closer. The standard text on Mathematics SE is in Georgia (then Times New Roman), but the maths are rendered using special mathematics/science fonts (you can right-click on the maths to get help.)MathJax uses the STIX font family if installed on the user's computer. It's very close to Georgia and Times New Roman, the traditional kind of typeface used in scholarly publications.
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The STIX font family is given out for free (OTF format) by a group of science&technology publishing companies, see and MathJax's user help pages: Also, the STIX font family happens to be preinstalled in OS X 10.7.If the STIX font is not installed, MathJax resorts to other suitable fonts depending on operating system and browser version, including web fonts. The MathJax documentation has more on these internals: What MathJax font configuration is used on Mathematics SE, you probably better ask in their Meta forum.Here are two screenshots for comparison. The first one with the STIX font family, the second one after I deactivated STIX on my system. I believe it's a web font, but I'm not sure. (Safari in OS X 10.7, where the STIX font family is preinstalled):Original question.