[jtown,man]

Originally Posted by SIGSEGV

Well it's a chi and an expectation value, with some notation abuse... (or, less abusive but even more obscure, some other operation using Dirac notation, see https://en.wikipedia.org/wiki/Bra%E2%80%93ket_notation).

The only B I've been giving in grad school was from a quantitative class that required I use Chi and other mathematical crap I am completely obvious to. I even paid for tutors and still couldn't make an A!

I seriously would rather give a speech in Chinese than do that type of math.