The red box only
The Attempt at a Solution
I suppose we have to show
L_3 (Π_1) | E,m> = λ (Π_1) | E,m>
H (Π_1) | E,m> = μ (Π_1) | E,m>
And I guess there is something to do with the formula given? But they are in x_1 direction so what did they have to do with | E,m> ?
Any hints given will be much appreciated.