@Firr I'm just going to say this: from my inexpert background, the kinds of notation on here are typically related to things the average person should not be in the same room with. Especially because if I'm not mistaken you have just a teensy bit of quantum near the upper right.
There is a likelihood I am incredibly mistaken, but I would advise against touching anything and if you see someone running, just try to keep up. XD
@bluestarultor @Firr No, it's definitely quantum mechanics, all of it really.
There's a good amount of https://de.wikipedia.org/wiki/Dirac-Notation / https://en.wikipedia.org/wiki/Bra%E2%80%93ket_notation in there. (Again the German samples are closer, but I only *almost* studied this.)
Notably, this is physicist notation, with dividing |, not the one with , used by mathematicians.