# Testing KaTex

This is a test to see if KaTex is working.

\begin{align*} f(x) = \pi r^2\\ \end{align*}

The answer is no, but mathjax does seem to work.

## Getting it Working

Edit the `conf.py` file.

- Uncomment the second
MATHJAX_CONFIGdefault (the one with actual content instead of an empty string).- Set
EXTRA_HEAD_DATAto the mathjax CDN.

EXTRA_HEAD_DATA = ''' <script type="text/javascript" async src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML"> </script> '''

Note

The documentation says that you need to add the `mathjax` tag to the post, but the `conf.py` has `HIDDEN_TAGS = ['mathjax']` which I think makes it work anyway. The documentation also makes no mention of the need for the CDN (or installing the javascript) but nikola doesn't seem to come with mathjax otherwise.