What is "mathjax"

MathJax is a cross-browser JavaScript library that displays mathematical notation in web browsers, using MathML, LaTeX and ASCIIMathML markup. MathJax is released as open-source software under the Apache License.

The MathJax project started in 2009 as the successor to an earlier JavaScript mathematics formatting library, jsMath, and is managed by the American Mathematical Society. The project was founded by the American Mathematical Society, Design Science, and the Society for Industrial and Applied Mathematics and is supported by numerous sponsors such as the American Institute of Physics and Stack Exchange.

MathJax is used by web sites including arXiv, Elsevier's ScienceDirect, MathSciNet, n-category cafe, MathOverflow, Wikipedia, Scholarpedia, Project Euclid journals, IEEEXplore, Publons, and the All-Russian Mathematical Portal.