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xdrgnh
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I'm studying for a qualifying exam and I see something very strange in the answer key to one of the problems from a past qualifying exam. It appears the sigma^2 for a two electron system has eigenvalues according to the picture below of 4s(s+1) while from my understand of Sakurai it should have eigenvalue of s(s+1). Can anyone shed some light on this, I suspect it is an error.
![Screen%20Shot%202017-08-26%20at%2011.01.47%20PM.png](http://file:///Users/dbb46/Desktop/Screen%20Shot%202017-08-26%20at%2011.01.47%20PM.png)