http://docs.mathjax.org/en/latest/input/tex/extensions/physics.html
To load the physics extension, add
'[tex]/physics'
to theload
array of theloader
block of your MathJax configuration, and add'physics'
to thepackages
array of thetex
block.
Or is there a way to edit global config file, eg: ./.obsidianrc
to enable physics package automatically?