{Math on the Web: Implementing MathJax in Project~Euclid} {Steve Grathwohl and David Ruddy} {Project Euclid, a collaboration between Cornell University Library and Duke University Press, provides an online repository and publishing environment for independent mathematics and statistics journals. We discuss the issues surrounding the online display of mathematics at Project Euclid and, more specifically, the implementation of MathJax, an open-source, Ajax-based math display solution supporting both \TeX\ and \MathML\ notation.}