MathWrite¶

http://docs.mathjax.org/en/latest/start.html#mathjax-cdn

https://github.com/holidayworking/redmine_latex_mathjax

Anywhere on a wiki page write for inline formulas (inlineMath):

$\sum_i x_i$

and for block type formulas (displayMath):

$$\sum_i x_i$$