# Katex pmatrix rendering not working?

Using…
Joplin 1.0.179 (prod, win32)
Client ID: 277e230be2954bcfb9a3e8fe6bc92b4e
Sync Version: 1
on Windows 10

Using the katex pmatrix tags as stated here:

Seems to result in the parenthesis not showing.
Of course, this could be because I made a mistake in my Katex syntax. So I am going to paste both my markdown and then describe the rendered result.

Here’s my markdown:

#### Example: 2D Reflection about the y-axis

\begin{pmatrix} -1 & 0\\ 0 & 1 \end{pmatrix} \begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} -x \\ y \end{pmatrix}

I was just trying to take some math notes
The rendered output seems to not show any parentheses at all. Sometimes they show up but I can’t nail down a set of repro steps for when they are/aren’t showing up.

Anyone have any ideas? Bad katex expression? Bug in the rendering?

Thanks again everyone! Still Love Joplin - second post here!