This wordpress plugin is yet another simple plugin to load the MathJax scripts at the bottom of all of your pages. It uses a very all-inclusive mathjax configuration by default, with $’s and $$’s the default delimeters for in-line and displayed equations.

A preference pane is added to the “Settings” group where you can choose whether to use MathJax version 2 or 3, change the MathJax server location (CDN) and the MathJax configuration settings. (See the mathjax documentation for details on the options available.)
You can also specify a LaTeX “preamble” of newcommands which will be loaded in a hidden element near the top of each page.

Fork this plugin on GitHub.