Using...
Joplin 1.0.179 (prod, win32)
Client ID: 277e230be2954bcfb9a3e8fe6bc92b4e
Sync Version: 1
Revision: 66356d83 (HEAD)
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! 