I started the coursera quantum mechanics class (quite a challenge for me) 
and today I decided to use TW to take some notes, but I quickly found 
myself in similar situation desribed by Rafael: quite a few important 
symbols are unrecognized by current katex plugin (for example, I need \hbar 
in formulas but this gives error).

Based on the newer katex plugin in Jeremy's github, I've got things to now 
work by replacing the $:/plugins/tiddlywiki/katex/katex.min.js tiddler with 
https://raw.githubusercontent.com/Jermolene/TiddlyWiki5/ae001a19e5b3e43cf5388fd4e8d99788085649fe/plugins/tiddlywiki/katex/files/katex.min.js
 
and the $:/plugins/tiddlywiki/katex/katex.min.css tiddler with 
https://raw.githubusercontent.com/Jermolene/TiddlyWiki5/ae001a19e5b3e43cf5388fd4e8d99788085649fe/plugins/tiddlywiki/katex/files/katex.min.css

I just ignored the warning about editing shadow tiddlers, did the above 
replacement, saved the tiddlywiki, and the new symbols seems to work after 
reloading the wiki. I though I'd share as this hack manages to get me going 
now while I'll be waiting for the upcoming release.

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