If you know that B-left is 0 then you know what the form of the equation is on the right side (x>0)
Now its just a boundary condition problem. you need to find A-left and A-right so that the two equations match up at x = 0. Set the two equations equal to each other at x = 0 and also set...
Homework Statement
I need to show that < n l m | z | n l m > = 0 for all states | n l m>
[b]2. Relevent Equations:
L^2 = Lx^2 + Ly^2 + Lz ^2
Lx = yp(z) - zp(y)
Ly = zp(x) - xp(z)
Lz = xp(y) - yp(x)
L+/- = Lx +/- iLy
The Attempt at a Solution
I really don't know where to begin...