Yeah I remember that some of the notation in the proof confused me a bit too. I proved it to my satisfaction using a slightly different approach, but I don't re

Yeah I remember that some of the notation in the proof confused me a bit too. I proved it to my satisfaction using a slightly different approach, but I don't remember it well enough to write it out. (I'm sure it's trivial for anyone with math chops, but I don't got them.)