Homework Statement
Say we are adding angular momentum: J = J1+J2.
Now, how can i prove that J2 |j1,j2,m1,m2>\neq \lambda |j1j,2,m1,m2>
a.k.a. |j1j2,m1,m2> is not a eigenket of J2?
Homework Equations
J12|j1,j2,m1,m2>=j1|j1j,2,m1,m2>
J22|j1,j2,m1,m2>=j2|j1j,2,m1,m2>...