Please explain number three.
Commutator of two Operators A and B [A,B] = AB - BA.
Examples:
A = x and B = P = -ih/0x [x,p]y = xp - pxy = -ihx = ihy axOx
In the same way, y[y,p]y = ihy [p]y = ihy
Since this is true for all State Vectors w, [x,p] = ih [y,p] = ih [p] = ih
Also, [x,p] = [x,p] = 0 [y,p] = [yp,p] = 0 [p] = [.p] = 0
A = F and B = p = -ihV [F,p]y = -ih [FVy - VFw] = ihvF)y = ihy [Fp] = ih
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ie.eJ [1,E] = -ih
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