I have had a extremely busy couple weeks where I could not focus on my quantum reading, and so I am a little lost conceptually. I am using Griffiths, and I am having trouble understanding what is going on in sections 4.1-4.3, which deal with the Hydrogen atom, angular momentum, and the Schrodinger equation in 3D (no spin problems, thank God). I have done pretty well in the course so far, and can conceptually connect (hopefully) anything you say with the previous concepts explored in chapters 1-3. So, I am having an especially large problem understanding the notation and how it applies, specifically: R(n,l), c(j) as it applies specifically in this chapter, Y(m,l), P(m,l), and how this connects with calculating Psi. You do not have to write the equations out as I have those, but if you could please help me conceptually grasp what is going on.