## trialing maths markup

maths markup: $\eta_\text{th,2}$

which does not render on this site

here is a screenshot of that same markup rendering properly on try.discourse.org:

**Update** / 26 December 2017

A discourse MathJax plugin is required:

- the old plugin was upgraded in July 2017
- the new plugin is described here

But that is odd, this site already has the following plugin:

- MathJax support for Discourse / version = 0.4.1 / enabled = Y

Lets try something very simple: `$x_i$`

or $x_i$. Nope. That is broken.

**Update** / 05 January 2018

Just fixed the MathJax URL: https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js

$x$ Nope!

**Update** / 14 January 2018

Upgrade of Discourse to 2.0.0

$x$ Not this time either!