I was also surprised to learn about this formalism at my university, as it wasn’t mentioned in either the introductory nor the advanced lecture on QM, but turns out to be very helpful for understanding how/when classical mechanics can be a good approximation in a QM universe.
Thanks for all the pointers! I was, somewhat embarrassingly, unaware of the existence of that whole field.
I’m glad if this was helpful.
I was also surprised to learn about this formalism at my university, as it wasn’t mentioned in either the introductory nor the advanced lecture on QM, but turns out to be very helpful for understanding how/when classical mechanics can be a good approximation in a QM universe.